Porth Tywyn Mawr (Sandy Beach) (Isle of Anglesey) weather
Find a forecast
Here are our top tips to keep you, your friends and family safe at the beach with links to Royal National Lifeboat Institution (RNLI) and Met Office advice.
- Head to a lifeguarded beach; check the RNLI lifeguarded beach tool
- Follow RNLI Float to Live advice if you find yourself struggling in the water
- Know what to do if you get caught in a rip current (RNLI)
- Check the tide times to avoid getting cut off by the tide coming in
- Call 999 and ask for the coastguard in an emergency
- Learn more about staying safe at the beach
Forecast days
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Today. Maximum daytime temperature: 16 degrees Celsius; Minimum nighttime temperature: 14 degrees Celsius. Heavy rain. Sunrise: ; Sunset: . UV: Low; Pollution: Low; No pollen data.Today. Maximum daytime temperature: 16 degrees Celsius; Minimum nighttime temperature: 14 degrees Celsius. Heavy rain. Sunrise: ; Sunset: . UV: Low; Pollution: Low; No pollen data.
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Friday 29 September. Maximum daytime temperature: 16 degrees Celsius; Minimum nighttime temperature: 12 degrees Celsius. Clear changing to partly cloudy by early evening. Sunrise: ; Sunset: . UV: Moderate; Pollution: Low; No pollen data.Friday 29 September. Maximum daytime temperature: 16 degrees Celsius; Minimum nighttime temperature: 12 degrees Celsius. Clear changing to partly cloudy by early evening. Sunrise: ; Sunset: . UV: Moderate; Pollution: Low; No pollen data.
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Saturday 30 September. Maximum daytime temperature: 16 degrees Celsius; Minimum nighttime temperature: 15 degrees Celsius. Cloudy changing to heavy rain by lunchtime. Sunrise: ; Sunset: . UV: Low; Pollution: Low; No pollen data.Saturday 30 September. Maximum daytime temperature: 16 degrees Celsius; Minimum nighttime temperature: 15 degrees Celsius. Cloudy changing to heavy rain by lunchtime. Sunrise: ; Sunset: . UV: Low; Pollution: Low; No pollen data.
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Sunday 1 October. Maximum daytime temperature: 17 degrees Celsius; Minimum nighttime temperature: 14 degrees Celsius. Partly cloudy changing to sunny intervals by late morning. Sunrise: ; Sunset: . UV: Moderate; Pollution: Low; No pollen data.Sunday 1 October. Maximum daytime temperature: 17 degrees Celsius; Minimum nighttime temperature: 14 degrees Celsius. Partly cloudy changing to sunny intervals by late morning. Sunrise: ; Sunset: . UV: Moderate; Pollution: Low; No pollen data.
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Monday 2 October. Maximum daytime temperature: 16 degrees Celsius; Minimum nighttime temperature: 13 degrees Celsius. Cloudy changing to light rain in the afternoon. Sunrise: ; Sunset: . UV: Low; Pollution: Low; No pollen data.Monday 2 October. Maximum daytime temperature: 16 degrees Celsius; Minimum nighttime temperature: 13 degrees Celsius. Cloudy changing to light rain in the afternoon. Sunrise: ; Sunset: . UV: Low; Pollution: Low; No pollen data.
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Tuesday 3 October. Maximum daytime temperature: 15 degrees Celsius; Minimum nighttime temperature: 12 degrees Celsius. Clear changing to light showers by lunchtime. Sunrise: ; Sunset: . UV: Moderate;Tuesday 3 October. Maximum daytime temperature: 15 degrees Celsius; Minimum nighttime temperature: 12 degrees Celsius. Clear changing to light showers by lunchtime. Sunrise: ; Sunset: . UV: Moderate;
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Wednesday 4 October. Maximum daytime temperature: 15 degrees Celsius; Minimum nighttime temperature: 13 degrees Celsius. Cloudy. Sunrise: ; Sunset: . UV: Low;Wednesday 4 October. Maximum daytime temperature: 15 degrees Celsius; Minimum nighttime temperature: 13 degrees Celsius. Cloudy. Sunrise: ; Sunset: . UV: Low;
Seven day forecast for Porth Tywyn Mawr (Sandy Beach)
| Time | 19:00 | 20:00 | 21:00 | 22:00 | 23:00 |
|---|---|---|---|---|---|
| Weather symbol |
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Chance of precipitation
|
80% | 90% | 90% | 20% | 50% |
|
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14°
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15°
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14°
|
15°
|
15°
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|
|
11° | 11° | 11° | 12° | 12° |
|
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SSW
19
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SSW
20
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SSW
17
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SSW
17
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SW
17
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30 | 28 | 25 | 24 | 24 |
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1.1 | 1.1 | 1.1 | 0.9 | 0.8 |
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8 | 8 | 8 | 7 | 7 |
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Direction of waves offshore
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VG | E | VG | E | VG |
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Humidity
|
93% | 87% | 93% | 91% | 88% |
|
UV
|
- | - | - | - | - |
| 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 symbol |
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Chance of precipitation
|
30% | <5% | <5% | <5% | <5% | <5% | <5% | <5% | <5% | <5% | <5% | <5% | <5% | <5% | <5% | <5% | <5% | <5% | <5% | <5% | <5% | <5% | <5% | <5% |
|
|
15°
|
15°
|
14°
|
14°
|
14°
|
14°
|
14°
|
14°
|
14°
|
14°
|
15°
|
15°
|
15°
|
15°
|
16°
|
16°
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16°
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16°
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16°
|
15°
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15°
|
15°
|
15°
|
15°
|
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|
12° | 12° | 11° | 11° | 11° | 11° | 10° | 11° | 11° | 11° | 11° | 11° | 11° | 12° | 12° | 13° | 13° | 13° | 13° | 13° | 13° | 13° | 13° | 13° |
|
|
WSW
17
|
W
17
|
W
18
|
W
18
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W
19
|
W
19
|
W
20
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WSW
19
|
WSW
19
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WSW
20
|
WSW
21
|
WSW
21
|
WSW
20
|
WSW
20
|
WSW
20
|
WSW
18
|
WSW
16
|
WSW
16
|
WSW
15
|
SW
14
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WSW
14
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WSW
13
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WSW
13
|
W
12
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22 | 21 | 22 | 22 | 24 | 24 | 25 | 25 | 25 | 26 | 27 | 27 | 26 | 26 | 26 | 24 | 23 | 22 | 21 | 21 | 20 | 18 | 18 | 16 |
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|
0.8 | 0.8 | 0.8 | 0.9 | 1.0 | 1.0 | 1.0 | 1.1 | 1.1 | 1.1 | 1.2 | 1.1 | 1.1 | 1.1 | 1.1 | 1.0 | 1.0 | 0.9 | 0.8 | 0.8 | 0.8 | 0.8 | 0.7 | 0.7 |
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6 | 6 | 4 | 4 | 4 | 4 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 6 | 6 | 5 | 5 |
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Direction of waves offshore
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VG | E | E | E | E | E | E | E | E | E | E | E | E | E | E | E | E | E | E | E | E | E | E | E |
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Humidity
|
87% | 78% | 80% | 82% | 82% | 81% | 80% | 81% | 81% | 80% | 80% | 78% | 76% | 73% | 70% | 69% | 69% | 70% | 74% | 78% | 78% | 78% | 79% | 77% |
|
UV
|
- | - | - | - | - | - | - | - | 1 | 1 | 2 | 2 | 3 | 3 | 3 | 2 | 1 | 1 | 1 | - | - | - | - | - |
| Time | 00:00 | 01:00 | 04:00 | 07:00 | 10:00 | 13:00 | 16:00 | 19:00 | 22:00 |
|---|---|---|---|---|---|---|---|---|---|
| Weather symbol |
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Chance of precipitation
|
<5% | <5% | 10% | 10% | 60% | 90% | 90% | 90% | 80% |
|
|
15°
|
14°
|
13°
|
13°
|
14°
|
14°
|
14°
|
16°
|
17°
|
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|
13° | 13° | 12° | 12° | 12° | 11° | 11° | 11° | 12° |
|
|
W
11
|
W
10
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SSW
6
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S
8
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SSE
13
|
S
18
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SSE
20
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SSW
27
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SSW
25
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14 | 12 | 8 | 14 | 20 | 28 | 32 | 42 | 39 |
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0.6 | 0.6 | 0.5 | 0.4 | 0.5 | 0.7 | 0.6 | 1.2 | 1.3 |
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5 | 5 | 8 | 9 | 7 | 3 | 5 | 6 | 8 |
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Direction of waves offshore
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E | E | VG | VG | G | M | M | M | G |
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Humidity
|
78% | 78% | 82% | 90% | 84% | 85% | 87% | 91% | 92% |
|
UV
|
- | - | - | - | 1 | 1 | 1 | - | - |
| Time | 01:00 | 04:00 | 07:00 | 10:00 | 13:00 | 16:00 | 19:00 | 22:00 |
|---|---|---|---|---|---|---|---|---|
| Weather symbol |
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Chance of precipitation
|
20% | 20% | 10% | 10% | 10% | 10% | 10% | 10% |
|
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16°
|
16°
|
16°
|
16°
|
16°
|
16°
|
16°
|
15°
|
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|
13° | 13° | 13° | 13° | 14° | 14° | 13° | 13° |
|
|
SSW
21
|
SW
18
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SW
17
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SW
17
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SW
16
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SW
16
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SSW
15
|
SW
14
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33 | 28 | 26 | 27 | 27 | 26 | 24 | 22 |
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1.1 | 1.0 | 0.9 | 1.0 | 1.0 | 0.8 | 0.8 | 0.8 |
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8 | 9 | 8 | 5 | 5 | 5 | 5 | 5 |
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Direction of waves offshore
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G | G | G | VG | VG | VG | VG | VG |
|
Humidity
|
94% | 94% | 93% | 90% | 83% | 82% | 90% | 92% |
|
UV
|
- | - | - | 1 | 3 | 1 | - | - |
| Time | 01:00 | 04:00 | 07:00 | 10:00 | 13:00 | 16:00 | 19:00 | 22:00 |
|---|---|---|---|---|---|---|---|---|
| Weather symbol |
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Chance of precipitation
|
10% | 10% | 10% | 10% | 20% | 40% | 10% | 10% |
|
|
15°
|
15°
|
14°
|
15°
|
15°
|
15°
|
15°
|
14°
|
|
|
13° | 13° | 13° | 13° | 13° | 13° | 12° | 12° |
|
|
SW
12
|
SSW
10
|
SSW
11
|
SSW
13
|
S
13
|
SSW
14
|
WSW
14
|
W
16
|
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18 | 15 | 16 | 20 | 21 | 22 | 20 | 24 |
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0.7 | 0.5 | 0.4 | 0.3 | 0.2 | 0.2 | 0.2 | 0.4 |
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5 | 5 | 6 | 7 | 9 | 9 | 9 | 3 |
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Direction of waves offshore
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G | VG | G | G | G | G | G | VG |
|
Humidity
|
91% | 91% | 92% | 85% | 80% | 81% | 87% | 85% |
|
UV
|
- | - | - | 1 | 2 | 1 | - | - |
| Time | 01:00 | 04:00 | 07:00 | 10:00 | 13:00 | 16:00 | 19:00 | 22:00 |
|---|---|---|---|---|---|---|---|---|
| Weather symbol |
|
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|
|
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Chance of precipitation
|
<5% | <5% | <5% | 10% | 30% | <5% | <5% | <5% |
|
|
14°
|
13°
|
13°
|
14°
|
15°
|
15°
|
15°
|
14°
|
|
|
11° | 10° | 10° | 10° | 11° | 12° | 12° | 12° |
|
|
W
18
|
W
20
|
W
21
|
W
21
|
W
20
|
W
18
|
W
15
|
W
15
|
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27 | 29 | 31 | 33 | 33 | 29 | 22 | 21 |
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0.8 | 1.1 | 1.4 | 1.6 | 1.8 | 1.5 | 1.2 | 1.3 |
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4 | 5 | 5 | 6 | 6 | 6 | 6 | 5 |
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Direction of waves offshore
|
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VG | VG | VG | VG | VG | VG | VG | VG |
|
Humidity
|
83% | 84% | 84% | 78% | 72% | 69% | 78% | 82% |
|
UV
|
- | - | - | 2 | 3 | 1 | - | - |
| Time | 01:00 | 04:00 | 07:00 | 10:00 | 13:00 | 16:00 | 19:00 | 22:00 |
|---|---|---|---|---|---|---|---|---|
| Weather symbol |
|
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|
|
|
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Chance of precipitation
|
<5% | 10% | 10% | 10% | 10% | 10% | 10% | 10% |
|
|
14°
|
13°
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13°
|
14°
|
15°
|
15°
|
14°
|
14°
|
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11° | 11° | 11° | 12° | 12° | 12° | 12° | 11° |
|
|
W
14
|
WSW
13
|
WSW
12
|
SW
14
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SW
15
|
SW
16
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SSW
16
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SSW
16
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19 | 18 | 18 | 21 | 25 | 25 | 24 | 25 |
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1.3 | – | – | – | – | – | – | – |
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5 | – | – | – | – | – | – | – |
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Direction of waves offshore
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– | – | – | – | – | – | – |
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VG | VG | VG | VG | VG | VG | VG | VG |
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Humidity
|
87% | 89% | 89% | 81% | 74% | 74% | 84% | 86% |
|
UV
|
- | - | - | 1 | 2 | 1 | - | - |
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.
Tide times
Time © Crown Copyright and database right.
Tide times
© Crown Copyright and database right.
Tide times
© Crown Copyright and database right.
Tide times
© Crown Copyright and database right.
Tide times
© Crown Copyright and database right.
Tide times
© Crown Copyright and database right.
Tide times
© Crown Copyright and database right.
Tide times
© Crown Copyright and database right.
Tide times
© Crown Copyright and database right.
Tide times
© Crown Copyright and database right.
Tide times
© Crown Copyright and database right.
UK video forecast
Wales weather forecast
Headline:
Rain overnight clearing to sunny spells Friday.
This Evening and Tonight:
Wet end to Thursday as outbreaks of rain spread across the country that could be heavy in places, particularly further south. Becoming drier through the early hours with some clearer spells developing. Turning chillier once skies clear. Minimum temperature 10 °C.
Friday:
A largely dry day with sunny spells, though an isolated shower may pop up. Breezy by day and feeling fresher, but winds easing into the evening. Maximum temperature 18 °C.
Outlook for Saturday to Monday:
Chilly but fine start to Saturday ahead of rain arriving later with winds strengthening again. Brighter intervals Sunday, primarily further north. Cloudy with outbreaks of rain on Monday. Turning milder.
Updated:
UK long range weather forecast
The period is expected to begin with a cool west to northwesterly flow, with sunshine and showers, these most frequent in the northwest with drier conditions elsewhere. Winds are likely to gradually turn southwesterly, with a settled interlude (a small chance this could develop into a prolonged settled spell), most likely deteriorating into further periods of changeable or even unsettled weather by the weekend of the 7th and 8th. Towards the end of this period, signals show a potential trend towards drier weather in the north, and wetter conditions in the south, although precisely when is, typically for the forecast range, very low confidence. Temperatures likely to be above average overall, perhaps very warm at times in the south, though some cool nights and chance of early fog.
Updated:
A slowly evolving weather pattern is considered more likely through this period, though with a typical mix of settled and unsettled spells of weather. Within the more settled periods it is possible that northern parts will receive below average rainfall, with the south possibly receiving above average rainfall. Temperatures are more likely to be above average than below average overall, but with chilly nights in settled conditions.
Updated:
