Porthmadog (Gwynedd) weather
Find a forecast
Forecast days
-
Today. Maximum daytime temperature: 10 degrees Celsius; Minimum nighttime temperature: 3 degrees Celsius. Cloudy changing to clear by nighttime. Sunrise: ; Sunset: . UV: Moderate; Pollution: Low; Pollen: Moderate. Tide: Next high at .Today. Maximum daytime temperature: 10 degrees Celsius; Minimum nighttime temperature: 3 degrees Celsius. Cloudy changing to clear by nighttime. Sunrise: ; Sunset: . UV: Moderate; Pollution: Low; Pollen: Moderate. Tide: Next high at .
-
Friday 26 April. Maximum daytime temperature: 11 degrees Celsius; Minimum nighttime temperature: 5 degrees Celsius. Sunny changing to cloudy by lunchtime. Sunrise: ; Sunset: . UV: Moderate; Pollution: Low; Pollen: Moderate. Tide: First high at .Friday 26 April. Maximum daytime temperature: 11 degrees Celsius; Minimum nighttime temperature: 5 degrees Celsius. Sunny changing to cloudy by lunchtime. Sunrise: ; Sunset: . UV: Moderate; Pollution: Low; Pollen: Moderate. Tide: First high at .
-
Saturday 27 April. Maximum daytime temperature: 11 degrees Celsius; Minimum nighttime temperature: 4 degrees Celsius. Cloudy changing to sunny intervals by late morning. Sunrise: ; Sunset: . UV: Moderate; Pollution: Low; Pollen: Moderate. Tide: First high at .Saturday 27 April. Maximum daytime temperature: 11 degrees Celsius; Minimum nighttime temperature: 4 degrees Celsius. Cloudy changing to sunny intervals by late morning. Sunrise: ; Sunset: . UV: Moderate; Pollution: Low; Pollen: Moderate. Tide: First high at .
-
Sunday 28 April. Maximum daytime temperature: 11 degrees Celsius; Minimum nighttime temperature: 8 degrees Celsius. Sunny intervals changing to cloudy by late morning. Sunrise: ; Sunset: . UV: Moderate; Pollution: Low; Pollen: Moderate. Tide: First high at .Sunday 28 April. Maximum daytime temperature: 11 degrees Celsius; Minimum nighttime temperature: 8 degrees Celsius. Sunny intervals changing to cloudy by late morning. Sunrise: ; Sunset: . UV: Moderate; Pollution: Low; Pollen: Moderate. Tide: First high at .
-
Monday 29 April. Maximum daytime temperature: 12 degrees Celsius; Minimum nighttime temperature: 9 degrees Celsius. Light showers changing to cloudy by late morning. Sunrise: ; Sunset: . UV: Moderate; Pollution: Low; Pollen: Moderate. Tide: First high at .Monday 29 April. Maximum daytime temperature: 12 degrees Celsius; Minimum nighttime temperature: 9 degrees Celsius. Light showers changing to cloudy by late morning. Sunrise: ; Sunset: . UV: Moderate; Pollution: Low; Pollen: Moderate. Tide: First high at .
-
Tuesday 30 April. Maximum daytime temperature: 15 degrees Celsius; Minimum nighttime temperature: 9 degrees Celsius. Cloudy. Sunrise: ; Sunset: . UV: Moderate; Tide: First high at .Tuesday 30 April. Maximum daytime temperature: 15 degrees Celsius; Minimum nighttime temperature: 9 degrees Celsius. Cloudy. Sunrise: ; Sunset: . UV: Moderate; Tide: First high at .
-
Wednesday 1 May. Maximum daytime temperature: 15 degrees Celsius; Minimum nighttime temperature: 9 degrees Celsius. Cloudy changing to sunny intervals by early evening. Sunrise: ; Sunset: . UV: Moderate; Tide: First high at .Wednesday 1 May. Maximum daytime temperature: 15 degrees Celsius; Minimum nighttime temperature: 9 degrees Celsius. Cloudy changing to sunny intervals by early evening. Sunrise: ; Sunset: . UV: Moderate; Tide: First high at .
Seven day forecast for Porthmadog
| Time | 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 |
|
|
|
|
|
|
|
|
|
|
|
|
|
Chance of precipitation
|
10% | 10% | 10% | 10% | 10% | 20% | 10% | 10% | <5% | <5% | <5% | <5% |
|
|
9°
|
10°
|
9°
|
9°
|
9°
|
8°
|
8°
|
8°
|
8°
|
7°
|
6°
|
5°
|
|
|
7° | 7° | 7° | 7° | 7° | 6° | 7° | 7° | 6° | 5° | 4° | 3° |
|
|
NW
10
|
NW
10
|
NNW
10
|
NW
10
|
NNW
8
|
NNW
7
|
N
5
|
NE
5
|
NNE
5
|
NNE
5
|
NNE
5
|
NE
6
|
|
|
14 | 15 | 14 | 14 | 12 | 10 | 8 | 7 | 8 | 9 | 9 | 10 |
|
|
VG | VG | VG | VG | VG | VG | VG | VG | VG | VG | VG | VG |
|
Humidity
|
64% | 63% | 69% | 72% | 74% | 77% | 73% | 75% | 75% | 76% | 79% | 79% |
|
UV
|
3 | 4 | 3 | 3 | 3 | 2 | 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 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Chance of precipitation
|
<5% | <5% | <5% | <5% | <5% | <5% | <5% | <5% | <5% | <5% | <5% | <5% | <5% | 10% | <5% | 10% | 40% | 40% | 10% | <5% | <5% | <5% | 10% | <5% |
|
|
5°
|
5°
|
4°
|
4°
|
4°
|
4°
|
4°
|
4°
|
6°
|
7°
|
8°
|
9°
|
10°
|
10°
|
10°
|
10°
|
9°
|
9°
|
8°
|
8°
|
7°
|
7°
|
6°
|
6°
|
|
|
3° | 3° | 2° | 1° | 1° | 1° | 1° | 1° | 3° | 5° | 6° | 7° | 8° | 8° | 8° | 8° | 7° | 6° | 6° | 5° | 5° | 3° | 3° | 3° |
|
|
NE
6
|
NE
6
|
NE
7
|
NE
8
|
NE
8
|
NE
8
|
NE
9
|
NE
9
|
ENE
9
|
ENE
8
|
ENE
9
|
ENE
9
|
ENE
8
|
ENE
10
|
NE
11
|
NE
8
|
N
9
|
E
8
|
NE
10
|
NE
11
|
NE
10
|
NE
11
|
NE
10
|
NE
9
|
|
|
9 | 10 | 11 | 11 | 13 | 14 | 14 | 13 | 14 | 14 | 15 | 15 | 14 | 16 | 17 | 14 | 15 | 15 | 18 | 19 | 18 | 18 | 15 | 15 |
|
|
VG | VG | VG | VG | VG | VG | VG | VG | VG | VG | VG | E | E | VG | VG | VG | VG | G | VG | VG | VG | VG | VG | VG |
|
Humidity
|
81% | 79% | 81% | 83% | 84% | 85% | 83% | 80% | 72% | 62% | 55% | 51% | 48% | 48% | 50% | 51% | 56% | 63% | 64% | 66% | 68% | 74% | 75% | 78% |
|
UV
|
- | - | - | - | - | - | - | 1 | 2 | 2 | 3 | 4 | 5 | 5 | 5 | 4 | 3 | 2 | 2 | 1 | 1 | - | - | - |
| Time | 00:00 | 01:00 | 04:00 | 07:00 | 10:00 | 13:00 | 16:00 | 19:00 | 22:00 |
|---|---|---|---|---|---|---|---|---|---|
| Weather symbols |
|
|
|
|
|
|
|
|
|
|
Chance of precipitation
|
<5% | <5% | <5% | 10% | <5% | 10% | 10% | 10% | <5% |
|
|
6°
|
6°
|
5°
|
6°
|
9°
|
10°
|
10°
|
9°
|
7°
|
|
|
3° | 3° | 2° | 3° | 6° | 8° | 8° | 7° | 4° |
|
|
NE
9
|
NE
9
|
NE
9
|
NE
9
|
ENE
10
|
ENE
11
|
NE
10
|
NE
10
|
NE
8
|
|
|
15 | 15 | 15 | 16 | 18 | 19 | 18 | 18 | 14 |
|
|
VG | VG | VG | VG | VG | VG | VG | VG | G |
|
Humidity
|
79% | 79% | 83% | 83% | 67% | 58% | 60% | 67% | 81% |
|
UV
|
- | - | - | 1 | 3 | 5 | 3 | 1 | - |
| Time | 01:00 | 04:00 | 07:00 | 10:00 | 13:00 | 16:00 | 19:00 | 22:00 |
|---|---|---|---|---|---|---|---|---|
| Weather symbols |
|
|
|
|
|
|
|
|
|
Chance of precipitation
|
<5% | <5% | <5% | 10% | 10% | 10% | <5% | 10% |
|
|
6°
|
5°
|
6°
|
9°
|
10°
|
10°
|
10°
|
9°
|
|
|
4° | 4° | 5° | 7° | 8° | 8° | 7° | 6° |
|
|
NNE
6
|
NNE
5
|
N
5
|
NNW
9
|
WNW
10
|
W
11
|
SW
12
|
SW
13
|
|
|
10 | 9 | 9 | 18 | 19 | 21 | 20 | 21 |
|
|
VG | VG | G | VG | VG | VG | VG | VG |
|
Humidity
|
85% | 86% | 87% | 69% | 66% | 65% | 68% | 78% |
|
UV
|
- | - | 1 | 3 | 5 | 3 | 1 | - |
| Time | 01:00 | 04:00 | 07:00 | 10:00 | 13:00 | 16:00 | 19:00 | 22:00 |
|---|---|---|---|---|---|---|---|---|
| Weather symbols |
|
|
|
|
|
|
|
|
|
Chance of precipitation
|
10% | 10% | 40% | 20% | 20% | 50% | 50% | 50% |
|
|
9°
|
9°
|
9°
|
10°
|
11°
|
12°
|
11°
|
10°
|
|
|
6° | 5° | 6° | 7° | 8° | 8° | 8° | 7° |
|
|
SSW
14
|
SSW
15
|
SSW
17
|
S
19
|
S
21
|
S
20
|
S
18
|
SSE
17
|
|
|
23 | 24 | 28 | 32 | 37 | 35 | 31 | 28 |
|
|
VG | G | G | G | G | G | G | G |
|
Humidity
|
82% | 85% | 84% | 78% | 75% | 73% | 77% | 82% |
|
UV
|
- | - | 1 | 2 | 4 | 3 | 1 | - |
| Time | 01:00 | 04:00 | 07:00 | 10:00 | 13:00 | 16:00 | 19:00 | 22:00 |
|---|---|---|---|---|---|---|---|---|
| Weather symbols |
|
|
|
|
|
|
|
|
|
Chance of precipitation
|
20% | 10% | 10% | 20% | 20% | 20% | 20% | 10% |
|
|
10°
|
10°
|
10°
|
12°
|
14°
|
14°
|
13°
|
11°
|
|
|
7° | 7° | 7° | 9° | 11° | 12° | 12° | 9° |
|
|
SSE
17
|
SSE
16
|
SE
14
|
SE
13
|
SSE
13
|
SE
11
|
E
8
|
E
9
|
|
|
27 | 26 | 23 | 23 | 24 | 20 | 14 | 15 |
|
|
VG | VG | G | VG | VG | VG | VG | G |
|
Humidity
|
79% | 80% | 79% | 73% | 63% | 63% | 75% | 85% |
|
UV
|
- | - | 1 | 3 | 5 | 3 | 1 | - |
| Time | 01:00 | 04:00 | 07:00 | 10:00 | 13:00 | 16:00 | 19:00 | 22:00 |
|---|---|---|---|---|---|---|---|---|
| Weather symbols |
|
|
|
|
|
|
|
|
|
Chance of precipitation
|
10% | 10% | 10% | 10% | 10% | 10% | 10% | 10% |
|
|
10°
|
10°
|
10°
|
12°
|
14°
|
14°
|
14°
|
12°
|
|
|
9° | 8° | 9° | 11° | 13° | 12° | 12° | 10° |
|
|
E
8
|
ESE
7
|
ESE
7
|
SE
9
|
SE
10
|
SE
11
|
WNW
11
|
SSE
11
|
|
|
13 | 12 | 11 | 16 | 20 | 21 | 19 | 18 |
|
|
G | G | G | G | G | VG | VG | VG |
|
Humidity
|
91% | 93% | 92% | 84% | 77% | 77% | 80% | 86% |
|
UV
|
- | - | 1 | 3 | 4 | 2 | 1 | - |
Our weather symbols tell you the weather conditions for any given hour in the day or night. This means that the symbol for 9am shows you what you will see from 9am to 10am.
Chance of precipitation represents how likely it is that rain (or other types of precipitation, such as sleet, snow, hail or 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.
Forecast row information
UK video forecast
Wales weather forecast
Headline:
A chance of showers today and feeling rather cool.
Today:
Rather cold to begin the day with scattered showers, these perhaps heavy in the south. Turning much drier through the morning, leaving a bright afternoon. A cool breeze at times. Maximum temperature 13 °C.
Tonight:
Showers are possible in Pembrokeshire overnight but the rest of Wales will become dry and chilly with clear periods. Turning frosty in rural inland areas with patchy fog. Minimum temperature 3 °C.
Friday:
Dry, chilly and mostly sunny to start. Cloud bubbling up with a scattering of showers developing but many places remaining dry. Light winds but still feeling rather cool. Maximum temperature 12 °C.
Outlook for Saturday to Monday:
Cloudy but mainly dry on Saturday, showers possible later. Breezier on Sunday and wet with heavy rain at times. Drier and brighter on Monday. Rather cool for late April.
Updated:
UK long range weather forecast
The weekend's rain probably clearing east and northeast to leave a drier day on Monday, although the chance of showers and even thunderstorms remains. Cloudier, wetter weather is likely to quickly arrive into the west, and slide east across southern areas early next week, such that the majority of the week will be characterised by wetter weather in southern UK, drier weather in northern, especially northwestern UK, and a chance of rain or even thundery showers for a time in the east. Temperatures likely to trend upwards, with the chance of a warm to very warm spell in some southern and eastern parts, before conditions probably turn drier, cooler and more settled from the west towards the end of the period.
Updated:
In this period, the chances of unsettled weather are slightly less than usual in the north and about the same as usual further south. Therefore, some spells of wetter weather are likely for all, but perhaps especially southern areas with the driest conditions probably further north. Temperatures probably near average though with some cooler interludes possible. Also worth noting that average temperatures themselves rise by around 1C per week at this time of year.
Updated:
