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Numerous rain warnings issued
Further heavy rain is forecast to fall on already saturated ground with rain and flood warnings issued.
Read morePorthmadog (Gwynedd) weather
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Forecast days
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Today. Maximum daytime temperature: 11 degrees Celsius; Minimum nighttime temperature: 9 degrees Celsius. Light rain. Sunrise: ; Sunset: . UV: Low; Pollution: Low; No pollen data. Tide: Next high at .Today. Maximum daytime temperature: 11 degrees Celsius; Minimum nighttime temperature: 9 degrees Celsius. Light rain. Sunrise: ; Sunset: . UV: Low; Pollution: Low; No pollen data. Tide: Next high at .
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Friday 8 December. Maximum daytime temperature: 10 degrees Celsius; Minimum nighttime temperature: 9 degrees Celsius. Heavy rain changing to cloudy by nighttime. Sunrise: ; Sunset: . UV: Low; Pollution: Low; No pollen data. Tide: First high at .Friday 8 December. Maximum daytime temperature: 10 degrees Celsius; Minimum nighttime temperature: 9 degrees Celsius. Heavy rain changing to cloudy by nighttime. Sunrise: ; Sunset: . UV: Low; Pollution: Low; No pollen data. Tide: First high at .
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Saturday 9 December. Maximum daytime temperature: 12 degrees Celsius; Minimum nighttime temperature: 9 degrees Celsius. Heavy rain changing to cloudy by lunchtime. Sunrise: ; Sunset: . UV: Low; Pollution: Low; No pollen data. Tide: First high at .Saturday 9 December. Maximum daytime temperature: 12 degrees Celsius; Minimum nighttime temperature: 9 degrees Celsius. Heavy rain changing to cloudy by lunchtime. Sunrise: ; Sunset: . UV: Low; Pollution: Low; No pollen data. Tide: First high at .
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Sunday 10 December. Maximum daytime temperature: 12 degrees Celsius; Minimum nighttime temperature: 9 degrees Celsius. Cloudy changing to heavy showers by late morning. Sunrise: ; Sunset: . UV: Low; Pollution: Low; No pollen data. Tide: First high at .Sunday 10 December. Maximum daytime temperature: 12 degrees Celsius; Minimum nighttime temperature: 9 degrees Celsius. Cloudy changing to heavy showers by late morning. Sunrise: ; Sunset: . UV: Low; Pollution: Low; No pollen data. Tide: First high at .
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Monday 11 December. Maximum daytime temperature: 11 degrees Celsius; Minimum nighttime temperature: 9 degrees Celsius. Partly cloudy changing to sunny by late morning. Sunrise: ; Sunset: . UV: Low; Pollution: Low; No pollen data. Tide: First high at .Monday 11 December. Maximum daytime temperature: 11 degrees Celsius; Minimum nighttime temperature: 9 degrees Celsius. Partly cloudy changing to sunny by late morning. Sunrise: ; Sunset: . UV: Low; Pollution: Low; No pollen data. Tide: First high at .
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Tuesday 12 December. Maximum daytime temperature: 10 degrees Celsius; Minimum nighttime temperature: 6 degrees Celsius. Light showers changing to cloudy by late morning. Sunrise: ; Sunset: . UV: Low; Tide: First high at .Tuesday 12 December. Maximum daytime temperature: 10 degrees Celsius; Minimum nighttime temperature: 6 degrees Celsius. Light showers changing to cloudy by late morning. Sunrise: ; Sunset: . UV: Low; Tide: First high at .
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Wednesday 13 December. Maximum daytime temperature: 9 degrees Celsius; Minimum nighttime temperature: 5 degrees Celsius. Partly cloudy. Sunrise: ; Sunset: . UV: Low; Tide: First high at .Wednesday 13 December. Maximum daytime temperature: 9 degrees Celsius; Minimum nighttime temperature: 5 degrees Celsius. Partly cloudy. Sunrise: ; Sunset: . UV: Low; Tide: First high at .
Seven day forecast for Porthmadog
| Time | 11:00 | 12:00 | 13:00 | 14:00 | 15:00 | 16:00 | 17:00 | 18:00 | 19:00 | 20:00 | 21:00 | 22:00 | 23:00 |
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| Weather symbols |
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Chance of precipitation
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70% | 90% | ≥95% | ≥95% | 60% | 30% | <5% | <5% | 60% | 30% | 10% | 40% | 20% |
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11°
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11°
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10°
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10°
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10°
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10°
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10°
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10°
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10°
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10°
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10°
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10°
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10°
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8° | 8° | 7° | 7° | 7° | 6° | 7° | 7° | 7° | 7° | 7° | 7° | 7° |
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SE
16
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SE
15
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SSE
19
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SSE
18
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S
21
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S
21
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S
18
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S
16
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SSW
14
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SSW
14
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SSW
16
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SSW
16
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SSW
14
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31 | 29 | 33 | 32 | 35 | 35 | 31 | 29 | 27 | 28 | 29 | 28 | 26 |
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M | M | G | M | G | E | E | VG | VG | VG | VG | VG | E |
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Humidity
|
83% | 86% | 84% | 87% | 89% | 91% | 92% | 92% | 93% | 91% | 90% | 87% | 87% |
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UV
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1 | 1 | 1 | 1 | 1 | - | - | - | - | - | - | - | - |
| Time | 00:00 | 01:00 | 02:00 | 03:00 | 04:00 | 05:00 | 06:00 | 07:00 | 08:00 | 09:00 | 10:00 | 11:00 | 12:00 | 13:00 | 14:00 | 15:00 | 16:00 | 17:00 | 18:00 | 19:00 | 20:00 | 21:00 | 22:00 | 23:00 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Weather symbols |
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Chance of precipitation
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80% | 80% | 30% | 60% | 60% | 20% | 20% | 20% | 90% | 60% | 90% | 90% | 80% | 80% | 50% | 50% | 40% | 20% | 20% | 50% | 50% | 10% | 10% | 10% |
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10°
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9°
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10°
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9°
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10°
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10°
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10°
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10°
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10°
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10°
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10°
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10°
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10°
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10°
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10°
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10°
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10°
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10°
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10°
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10°
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10°
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10°
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10°
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10°
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6° | 6° | 6° | 6° | 6° | 6° | 6° | 6° | 6° | 6° | 6° | 6° | 6° | 6° | 6° | 6° | 6° | 6° | 6° | 6° | 6° | 6° | 6° | 6° |
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SSW
19
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S
14
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SSW
18
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SSW
19
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SSW
19
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SSW
19
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SSW
19
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SW
20
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SSW
19
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SW
21
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SSW
20
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SW
22
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SW
22
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SW
22
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SW
23
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SW
23
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SW
23
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SW
24
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SW
23
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SW
23
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SW
23
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WSW
22
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SW
21
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SW
21
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32 | 26 | 31 | 32 | 32 | 33 | 33 | 34 | 34 | 35 | 34 | 37 | 37 | 37 | 39 | 39 | 39 | 40 | 39 | 39 | 38 | 38 | 37 | 36 |
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G | VG | E | E | E | E | E | E | E | VG | VG | G | G | G | VG | VG | VG | E | E | E | E | E | E | E |
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Humidity
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86% | 87% | 83% | 86% | 86% | 85% | 83% | 83% | 84% | 82% | 84% | 86% | 86% | 87% | 85% | 86% | 85% | 84% | 83% | 82% | 81% | 79% | 79% | 78% |
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UV
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- | - | - | - | - | - | - | - | - | 1 | 1 | 1 | 1 | 1 | 1 | 1 | - | - | - | - | - | - | - | - |
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| Weather symbols |
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Chance of precipitation
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10% | 90% | 90% | 50% | 40% | 10% | 10% | 10% |
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10°
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10°
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10°
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11°
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11°
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11°
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10°
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10°
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7° | 6° | 7° | 8° | 7° | 7° | 6° | 6° |
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SW
19
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S
16
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S
20
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SW
18
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WSW
22
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WSW
22
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W
23
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WSW
22
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34 | 27 | 34 | 31 | 37 | 39 | 40 | 38 |
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E | M | M | VG | E | VG | VG | VG |
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Humidity
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79% | 91% | 92% | 86% | 76% | 72% | 70% | 74% |
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UV
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- | - | - | 1 | 1 | 1 | - | - |
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| Weather symbols |
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Chance of precipitation
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<5% | <5% | 20% | 60% | 60% | 40% | 40% | 20% |
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9°
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9°
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10°
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10°
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11°
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11°
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11°
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11°
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6° | 6° | 7° | 7° | 7° | 8° | 7° | 7° |
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WSW
20
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WSW
16
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SSW
16
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S
20
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SSW
23
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SW
21
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SW
21
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SW
23
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34 | 27 | 26 | 33 | 38 | 36 | 36 | 39 |
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VG | VG | VG | G | G | VG | VG | VG |
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Humidity
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77% | 80% | 82% | 86% | 86% | 81% | 81% | 83% |
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UV
|
- | - | - | 1 | 1 | 1 | - | - |
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| Weather symbols |
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Chance of precipitation
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40% | 10% | 10% | 10% | 20% | 40% | 40% | 60% |
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10°
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10°
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10°
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9°
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11°
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10°
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10°
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10°
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7° | 7° | 7° | 6° | 8° | 8° | 8° | 7° |
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WSW
23
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WSW
21
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WSW
17
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WSW
15
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SW
14
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SSW
13
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SSW
15
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SW
15
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39 | 35 | 29 | 25 | 24 | 21 | 24 | 24 |
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VG | VG | VG | VG | VG | G | G | G |
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Humidity
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83% | 82% | 84% | 86% | 85% | 90% | 92% | 91% |
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UV
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- | - | - | 1 | 1 | 1 | - | - |
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| Weather symbols |
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Chance of precipitation
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40% | 50% | 40% | 20% | 40% | 30% | 10% | 10% |
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10°
|
10°
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9°
|
9°
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10°
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9°
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8°
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8°
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7° | 7° | 7° | 7° | 7° | 7° | 6° | 5° |
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SW
14
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SW
13
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WSW
12
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W
10
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W
11
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NW
11
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N
13
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N
12
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22 | 21 | 20 | 17 | 19 | 18 | 21 | 20 |
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G | G | G | VG | G | G | G | VG |
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Humidity
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91% | 92% | 92% | 90% | 87% | 87% | 88% | 86% |
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UV
|
- | - | - | 1 | 1 | 1 | - | - |
| Time | 00:00 | 03:00 | 06:00 | 09:00 | 12:00 | 15:00 | 18:00 | 21:00 |
|---|---|---|---|---|---|---|---|---|
| Weather symbols |
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Chance of precipitation
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10% | 10% | 10% | 10% | 10% | 10% | 10% | 10% |
|
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8°
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7°
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7°
|
8°
|
9°
|
8°
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7°
|
7°
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5° | 4° | 4° | 5° | 6° | 5° | 4° | 5° |
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NNW
12
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NNW
11
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N
11
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N
10
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N
11
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NNW
10
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NNW
10
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NW
10
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20 | 19 | 19 | 18 | 18 | 17 | 15 | 16 |
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VG | VG | VG | VG | VG | VG | VG | G |
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Humidity
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84% | 85% | 84% | 83% | 78% | 80% | 85% | 85% |
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UV
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- | - | - | 1 | 1 | 1 | - | - |
Our weather symbols tell you the weather conditions for any given hour in the day or night. This means that the symbol for 09:00 shows you what you will see from 09:00 to 10:00.
Chance of precipitation represents how likely it is that rain (or other types of precipitation, such as sleet, snow, hail and drizzle) will fall from the sky at a certain time.
This number shows the air temperature for the time period. You can see the temperature in Celsius or Fahrenheit by using the dropdown menu.
Feels like temperature considers other factors, such as wind speed and humidity. This gives you a better idea of how the temperature will actually feel at the time.
Wind gust shows the highest wind speed that you should encounter at that time, as winds peak and lull.
Strong winds are shown in bold for speeds of 29 mph or more.
The arrow shows the direction the wind is blowing. The letters show the direction the wind is blowing from (on a standard 16-point compass).
The number represents the average wind speed expected at that time.
The arrow shows the direction of the wind (up is north). If the arrow points from land to sea, the wind will be blowing out to sea (‘offshore’). The number is the average wind speed.
Beware of offshore winds if you are using inflatables, paddle boards or kayaks. These winds can blow you out to sea. Read more about how wind will affect you at the beach.
Visibility measures the distance at which an object can be clearly seen.
| VP (Very Poor) | Less than 1 km |
| P (Poor) | 1.1 km to 4 km |
| M (Moderate) | 4.1 km to 10 km |
| G (Good) | 10.1 km to 20 km |
| VG (Very Good) | 20.1 km to 40 km |
| E (Excellent) | Greater than 40 km |
Humidity is the amount of water vapor in the air. If there is a lot of water vapour, the humidity will be high. The higher the percentage of humidity, the wetter it will feel outside.
UV exposure index and the protection required to help keep you safe:
No risk of UV - It’s safe to stay outside. Low - You can safely stay outside. Consider sunscreen in direct sunlight. Moderate - Take care during midday hours and do not spend too much time in the sun unprotected. Sunscreen advised. High - Seek shade during midday hours, cover up and wear sunscreen. Very high - Spend time in the shade between 11am and 3pm. Shirt, sunscreen and hat are essential. Extreme - Avoid being outside during midday hours. Shirt, sunscreen and hat essential.
This is the average height of the waves, 1-2 miles out to sea. The height of the waves can vary. The individual waves out to sea or at the beach can be higher than this number. If you are close to the water, keep an eye on the waves to stop you or your belongings being swept away.
Read more about calculating the expected height of the waves at the beach.
This is the average number of seconds between one wave and the next, 1-2 miles out to sea. A long wave period (more than 10 seconds) means the waves at the beach may be more powerful. Lifeguards can give you advice on waves if you’re planning to go into the water.
Read more about the period of waves.
The arrow shows the average direction of the waves 1-2 miles out to sea. It indicates how sheltered the beach will be from these waves. If the arrow points towards land, most of the waves’ power will reach the beach. If the arrow is parallel to or pointing away from land, the wave height is likely to be lower on the beach than it is offshore.
Lifeguards can give you advice on waves if you’re planning to go into the water.
Porthmadog weather map
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WARNING
Flood alerts in force
for Wales
Flood alerts in force
for Wales
Wales weather forecast
Headline:
Milder and windier with some heavy rain at times.
Today:
Dull with pulses of rain, particularly heavy over south-facing hills and coastal areas. Perhaps turning drier in the west later in the afternoon. Windy with gales on many coasts. Milder. Maximum temperature 9 °C.
Tonight:
Clear spells and frequent showers overnight, these often heavy, especially in the west. Winds easing this evening before strengthening overnight. Turning quite chilly in places but staying generally frost free. Minimum temperature 3 °C.
Friday:
Often cloudy with showers or longer periods of heavy rain, most persistent in the south and west. Milder than of late but very windy with gales in coastal areas. Maximum temperature 10 °C.
Outlook for Saturday to Monday:
Often cloudy with showers or longer periods of heavy rain, most persistent in the south and west. Milder than of late but very windy with gales in coastal areas.
Updated:
UK long range weather forecast
This period is likely to often be unsettled with areas of low pressure tracking northeastwards close to or over the UK. This means bands of rain moving in from the west or southwest, interspersed with brighter showery conditions. As such, the wettest weather is likely to be across western high ground, though all parts could see some heavy rain at times. There is a greater than normal likelihood of periods of very windy weather too. Potential for a drier spell of weather to develop for a time around mid-month, particularly in the south, with frost and fog more prevalent. Overall, a relatively mild period for the UK, with above average temperatures more likely than not, especially so in the south and west.
Updated:
Most likely to be unsettled with further bands of rain crossing the UK with brighter conditions and showers in between. The wettest and windiest conditions are most likely in the west and northwest. The chance of a colder spell of weather, with hazard such as snow and ice, does increase later in December and into the New Year period. However, conditions are more likely to remain generally mild and wet.
Updated:
