News
An autumnal week ahead
Cool and unsettled weather is expected throughout this week across the UK, with the windiest and wettest weather anticipated on Friday.
Read moreSt-Athan (Vale of Glamorgan) weather
Find a forecast
Forecast days
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Today. Maximum daytime temperature: 15 degrees Celsius; Minimum nighttime temperature: 9 degrees Celsius. Cloudy changing to light rain by early evening. Sunrise: 07:07; Sunset: 19:02. UV: Moderate; Pollution: Low; No pollen data.
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Wednesday 28 September. Maximum daytime temperature: 15 degrees Celsius; Minimum nighttime temperature: 9 degrees Celsius. Sunny intervals changing to cloudy by lunchtime. Sunrise: 07:09; Sunset: 18:59. UV: Moderate; Pollution: Low; No pollen data.
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Thursday 29 September. Maximum daytime temperature: 18 degrees Celsius; Minimum nighttime temperature: 7 degrees Celsius. Clear. Sunrise: 07:10; Sunset: 18:57. UV: Moderate; Pollution: Low; No pollen data.
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Friday 30 September. Maximum daytime temperature: 17 degrees Celsius; Minimum nighttime temperature: 13 degrees Celsius. Cloudy changing to light rain by lunchtime. Sunrise: 07:12; Sunset: 18:55. UV: Low; Pollution: Low; No pollen data.
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Saturday 1 October. Maximum daytime temperature: 17 degrees Celsius; Minimum nighttime temperature: 11 degrees Celsius. Partly cloudy changing to light showers by late morning. Sunrise: 07:14; Sunset: 18:52. UV: Low; Pollution: Low; No pollen data.
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Sunday 2 October. Maximum daytime temperature: 17 degrees Celsius; Minimum nighttime temperature: 10 degrees Celsius. Clear changing to cloudy in the afternoon. Sunrise: 07:15; Sunset: 18:50. UV: Moderate;
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Monday 3 October. Maximum daytime temperature: 18 degrees Celsius; Minimum nighttime temperature: 12 degrees Celsius. Cloudy. Sunrise: 07:17; Sunset: 18:48. UV: Low;
Seven day forecast for St-Athan
| Time | 15:00 | 16:00 | 17:00 | 18:00 | 19:00 | 20:00 | 21:00 | 22:00 | 23:00 |
|---|---|---|---|---|---|---|---|---|---|
| Weather symbol |
|
|
|
|
|
|
|
|
|
|
Chance of precipitation
|
20% | 10% | 10% | 50% | 50% | 50% | <5% | 10% | <5% |
|
|
14°
|
13°
|
14°
|
13°
|
12°
|
12°
|
11°
|
11°
|
10°
|
|
|
11° | 10° | 11° | 10° | 10° | 10° | 10° | 9° | 9° |
|
|
WNW
13
|
WNW
14
|
WNW
14
|
NW
12
|
NW
11
|
NW
10
|
NW
8
|
NW
8
|
NW
8
|
|
|
26 | 25 | 26 | 22 | 22 | 22 | 18 | 19 | 18 |
|
|
G | G | G | M | G | G | G | G | G |
|
Humidity
|
72% | 75% | 75% | 80% | 80% | 82% | 83% | 82% | 83% |
|
UV
|
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 symbol |
|
|
|
|
|
|
|
|
|
|
|
|
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|
|
|
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|
|
|
|
Chance of precipitation
|
<5% | <5% | <5% | <5% | <5% | <5% | <5% | <5% | <5% | <5% | <5% | 10% | <5% | 10% | 10% | 40% | <5% | <5% | <5% | <5% | <5% | <5% | <5% | <5% |
|
|
10°
|
10°
|
9°
|
9°
|
10°
|
9°
|
9°
|
9°
|
9°
|
11°
|
12°
|
13°
|
14°
|
14°
|
14°
|
15°
|
14°
|
14°
|
13°
|
12°
|
11°
|
10°
|
10°
|
9°
|
|
|
8° | 8° | 7° | 7° | 7° | 7° | 7° | 7° | 7° | 9° | 10° | 11° | 12° | 11° | 12° | 12° | 12° | 11° | 11° | 10° | 9° | 8° | 8° | 8° |
|
|
NW
8
|
NW
9
|
NW
7
|
NW
7
|
NW
8
|
NW
9
|
NW
9
|
NW
8
|
NW
7
|
NW
9
|
NW
10
|
NW
10
|
NW
10
|
NW
12
|
NW
10
|
NW
12
|
NW
11
|
NNW
11
|
NW
10
|
NW
9
|
NW
9
|
NW
8
|
NW
9
|
NW
8
|
|
|
18 | 21 | 20 | 19 | 20 | 19 | 21 | 19 | 17 | 16 | 16 | 17 | 17 | 19 | 17 | 19 | 18 | 18 | 18 | 19 | 18 | 18 | 18 | 17 |
|
|
VG | VG | VG | VG | VG | VG | VG | VG | VG | VG | VG | E | E | VG | E | E | VG | E | VG | VG | VG | VG | VG | VG |
|
Humidity
|
84% | 81% | 83% | 84% | 84% | 85% | 84% | 85% | 84% | 79% | 72% | 65% | 61% | 62% | 64% | 60% | 61% | 65% | 66% | 70% | 74% | 77% | 81% | 81% |
|
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 |
|
|
|
|
|
|
|
|
|
|
Chance of precipitation
|
<5% | <5% | 20% | <5% | <5% | <5% | 10% | <5% | <5% |
|
|
9°
|
10°
|
10°
|
10°
|
13°
|
16°
|
17°
|
14°
|
11°
|
|
|
8° | 8° | 8° | 8° | 11° | 14° | 15° | 13° | 10° |
|
|
NW
8
|
NW
8
|
NW
10
|
NW
8
|
N
11
|
N
12
|
N
10
|
N
7
|
N
6
|
|
|
18 | 18 | 21 | 16 | 20 | 21 | 18 | 11 | 10 |
|
|
VG | VG | VG | VG | VG | VG | VG | VG | VG |
|
Humidity
|
81% | 82% | 83% | 88% | 74% | 60% | 57% | 72% | 81% |
|
UV
|
- | - | - | - | 2 | 3 | 1 | - | - |
| Time | 01:00 | 04:00 | 07:00 | 10:00 | 13:00 | 16:00 | 19:00 | 22:00 |
|---|---|---|---|---|---|---|---|---|
| Weather symbol |
|
|
|
|
|
|
|
|
|
Chance of precipitation
|
<5% | <5% | 10% | 10% | 60% | 90% | 90% | 80% |
|
|
10°
|
9°
|
10°
|
13°
|
15°
|
15°
|
16°
|
15°
|
|
|
9° | 9° | 9° | 12° | 12° | 12° | 12° | 12° |
|
|
N
4
|
NNW
3
|
SE
5
|
SSW
9
|
SSW
14
|
SSW
15
|
SW
18
|
W
16
|
|
|
8 | 7 | 9 | 17 | 26 | 28 | 33 | 30 |
|
|
VG | G | M | G | G | M | M | G |
|
Humidity
|
86% | 89% | 89% | 83% | 79% | 85% | 89% | 88% |
|
UV
|
- | - | - | 1 | 1 | 1 | - | - |
| Time | 01:00 | 04:00 | 07:00 | 10:00 | 13:00 | 16:00 | 19:00 | 22:00 |
|---|---|---|---|---|---|---|---|---|
| Weather symbol |
|
|
|
|
|
|
|
|
|
Chance of precipitation
|
70% | 30% | 10% | 30% | 60% | 60% | 20% | 10% |
|
|
14°
|
14°
|
13°
|
15°
|
15°
|
15°
|
15°
|
14°
|
|
|
11° | 11° | 11° | 12° | 12° | 12° | 11° | 11° |
|
|
W
14
|
W
13
|
W
12
|
W
14
|
W
16
|
W
15
|
W
16
|
W
14
|
|
|
26 | 24 | 23 | 27 | 30 | 29 | 29 | 26 |
|
|
G | VG | G | G | G | G | VG | VG |
|
Humidity
|
87% | 86% | 85% | 83% | 82% | 80% | 82% | 82% |
|
UV
|
- | - | - | 1 | 2 | 1 | - | - |
| Time | 01:00 | 04:00 | 07:00 | 10:00 | 13:00 | 16:00 | 19:00 | 22:00 |
|---|---|---|---|---|---|---|---|---|
| Weather symbol |
|
|
|
|
|
|
|
|
|
Chance of precipitation
|
<5% | <5% | <5% | <5% | <5% | 10% | <5% | 10% |
|
|
13°
|
12°
|
12°
|
14°
|
16°
|
16°
|
14°
|
13°
|
|
|
10° | 10° | 10° | 12° | 13° | 13° | 12° | 12° |
|
|
WNW
13
|
WNW
13
|
WNW
12
|
WNW
13
|
W
14
|
W
14
|
W
12
|
W
10
|
|
|
25 | 24 | 22 | 25 | 27 | 26 | 20 | 17 |
|
|
VG | VG | VG | VG | VG | VG | VG | VG |
|
Humidity
|
82% | 84% | 84% | 78% | 68% | 67% | 76% | 81% |
|
UV
|
- | - | - | 2 | 3 | 1 | - | - |
| Time | 01:00 | 04:00 | 07:00 | 10:00 | 13:00 | 16:00 | 19:00 | 22:00 |
|---|---|---|---|---|---|---|---|---|
| Weather symbol |
|
|
|
|
|
|
|
|
|
Chance of precipitation
|
10% | 10% | 10% | 10% | 10% | 10% | 20% | 10% |
|
|
12°
|
12°
|
12°
|
14°
|
16°
|
16°
|
15°
|
14°
|
|
|
11° | 11° | 11° | 13° | 15° | 15° | 14° | 13° |
|
|
WNW
9
|
S
8
|
WSW
8
|
SW
10
|
SW
12
|
SW
11
|
WSW
10
|
WSW
9
|
|
|
15 | 14 | 14 | 18 | 21 | 19 | 17 | 16 |
|
|
VG | G | G | VG | VG | VG | VG | VG |
|
Humidity
|
85% | 87% | 88% | 82% | 75% | 78% | 81% | 85% |
|
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.
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 (Medium) | 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.
weather map
St-Athan
Detailed weather map
Forecast for HH:mm, EEE
Updated HH:mm (ZZZZ) on EEE dd MMM yyyy
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WARNING
Flood alerts in force
for Wales
Flood alerts in force
for Wales
Wales weather forecast
Headline:
Feeling autumnal with some showers and blustery winds.
Today:
Some sunny breaks but often cloudy with spells of showery rain, feeding in on the blustery northwesterly winds. Feeling autumnal again, especially in the wind. Maximum temperature 15 °C.
Tonight:
Some showers continuing, mainly towards northern and western coasts. Turning chilly under clear spells in between the showers with easing winds. Minimum temperature 4 °C.
Wednesday:
After a mostly dry and bright but chilly start, it is likely to turn cloudier through the morning with the some shower, most likely around coasts. Lighter winds than recently. Maximum temperature 16 °C.
Outlook for Thursday to Saturday:
Some showery rain on Thursday before clear skies mean a chilly night with a localised frost. Wind and rain spreading from the west on Friday, clearing to showers on Saturday.
Updated:
UK long range weather forecast
A mixture of sunny spells and showers or longer periods of rain are expected at the start of October. Showers are likely to be heaviest and most frequent across the north and whilst southern and eastern areas may see some rain at times, these areas likely seeing the best of the drier conditions. Winds generally light, but strong in the north and along eastern coasts. Later in the period, we may see a shift towards drier and more settled weather. Some spells of wetter weather remain likely at times; these are most probable in the northwest but could possibly spread to other areas too. Temperatures likely to be close to average throughout or perhaps slightly above average by the end of the period.
Updated:
Confidence is low through this period, but the most likely scenario is for drier and more settled conditions. Some periods of wetter weather remain likely, these most probable in the northwest, but also possibly spreading further south at times. Temperatures most likely to be near normal or slightly above normal.
Updated:
Nearest forecasts
- Llantwit Major 1.9 miles
- Fontygary Bay (Beach) 3.6 miles
- Cowbridge 3.9 miles
- Cardiff International Airport 4.0 miles
- Cold Knap, Barry (Beach) 6.2 miles
- Dyffryn House Gardens 6.2 miles
- Barry 6.9 miles
- Whitmore Bay, Barry (Beach) 7.2 miles
- Barry Island Pleasure Park 7.6 miles
- Southerndown (Beach) 7.7 miles