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Storm Agnes to bring winds and rain
Storm Agnes has been named by the Met Office as the deep area of low-pressure that will impact much of the UK on Wednesday and into Thursday.
Read moreMountain Ash (Rhondda Cynon Taf) weather
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Forecast days
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Today. Maximum daytime temperature: 17 degrees Celsius; Minimum nighttime temperature: 13 degrees Celsius. Light rain. Sunrise: ; Sunset: . UV: Low; Pollution: Low; No pollen data.Today. Maximum daytime temperature: 17 degrees Celsius; Minimum nighttime temperature: 13 degrees Celsius. Light rain. Sunrise: ; Sunset: . UV: Low; Pollution: Low; No pollen data.
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Thursday 28 September. Maximum daytime temperature: 17 degrees Celsius; Minimum nighttime temperature: 12 degrees Celsius. Cloudy changing to light rain by early evening. Sunrise: ; Sunset: . UV: Low; Pollution: Low; No pollen data.Thursday 28 September. Maximum daytime temperature: 17 degrees Celsius; Minimum nighttime temperature: 12 degrees Celsius. Cloudy changing to light rain by early evening. Sunrise: ; Sunset: . UV: Low; Pollution: Low; No pollen data.
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Friday 29 September. Maximum daytime temperature: 17 degrees Celsius; Minimum nighttime temperature: 8 degrees Celsius. Clear changing to partly cloudy by nighttime. Sunrise: ; Sunset: . UV: Moderate; Pollution: Low; No pollen data.Friday 29 September. Maximum daytime temperature: 17 degrees Celsius; Minimum nighttime temperature: 8 degrees Celsius. Clear changing to partly cloudy by nighttime. Sunrise: ; Sunset: . UV: Moderate; Pollution: Low; No pollen data.
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Saturday 30 September. Maximum daytime temperature: 17 degrees Celsius; Minimum nighttime temperature: 14 degrees Celsius. Cloudy changing to sunny intervals by lunchtime. Sunrise: ; Sunset: . UV: Moderate; Pollution: Low; No pollen data.Saturday 30 September. Maximum daytime temperature: 17 degrees Celsius; Minimum nighttime temperature: 14 degrees Celsius. Cloudy changing to sunny intervals by lunchtime. Sunrise: ; Sunset: . UV: Moderate; Pollution: Low; No pollen data.
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Sunday 1 October. Maximum daytime temperature: 18 degrees Celsius; Minimum nighttime temperature: 12 degrees Celsius. Light rain changing to sunny intervals in the afternoon. Sunrise: ; Sunset: . UV: Moderate; Pollution: Low; No pollen data.Sunday 1 October. Maximum daytime temperature: 18 degrees Celsius; Minimum nighttime temperature: 12 degrees Celsius. Light rain changing to sunny intervals in the afternoon. Sunrise: ; Sunset: . UV: Moderate; Pollution: Low; No pollen data.
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Monday 2 October. Maximum daytime temperature: 17 degrees Celsius; Minimum nighttime temperature: 9 degrees Celsius. Cloudy changing to sunny intervals in the afternoon. Sunrise: ; Sunset: . UV: Moderate;Monday 2 October. Maximum daytime temperature: 17 degrees Celsius; Minimum nighttime temperature: 9 degrees Celsius. Cloudy changing to sunny intervals in the afternoon. Sunrise: ; Sunset: . UV: Moderate;
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Tuesday 3 October. Maximum daytime temperature: 16 degrees Celsius; Minimum nighttime temperature: 8 degrees Celsius. Cloudy changing to sunny by late morning. Sunrise: ; Sunset: . UV: Moderate;Tuesday 3 October. Maximum daytime temperature: 16 degrees Celsius; Minimum nighttime temperature: 8 degrees Celsius. Cloudy changing to sunny by late morning. Sunrise: ; Sunset: . UV: Moderate;
Seven day forecast for Mountain Ash
| 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Weather symbol |
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Chance of precipitation
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50% | 10% | 50% | 50% | 50% | 50% | 60% | 10% | 40% | 70% | 90% | 60% | 50% |
|
|
15°
|
16°
|
16°
|
16°
|
17°
|
17°
|
17°
|
16°
|
16°
|
15°
|
15°
|
15°
|
15°
|
|
|
14° | 15° | 15° | 15° | 15° | 15° | 15° | 14° | 13° | 12° | 12° | 12° | 12° |
|
|
SSE
12
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SSE
12
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SSE
12
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SSE
13
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SSE
13
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SSE
13
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S
13
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SSW
14
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SSW
14
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SW
16
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SW
16
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SW
15
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WSW
14
|
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|
30 | 29 | 31 | 32 | 30 | 31 | 33 | 37 | 36 | 38 | 38 | 37 | 35 |
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M | G | G | G | G | G | M | VG | E | VG | G | G | VG |
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Humidity
|
96% | 93% | 92% | 89% | 89% | 88% | 91% | 83% | 78% | 82% | 86% | 86% | 84% |
|
UV
|
1 | 1 | 1 | 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 symbol |
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Chance of precipitation
|
50% | 10% | 10% | <5% | <5% | <5% | <5% | <5% | <5% | <5% | <5% | <5% | <5% | 10% | <5% | <5% | 10% | 20% | 60% | 60% | 60% | 80% | 80% | 80% |
|
|
15°
|
15°
|
14°
|
14°
|
14°
|
13°
|
13°
|
13°
|
13°
|
14°
|
14°
|
15°
|
16°
|
16°
|
16°
|
17°
|
16°
|
16°
|
15°
|
15°
|
15°
|
15°
|
15°
|
15°
|
|
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12° | 12° | 12° | 12° | 12° | 12° | 12° | 12° | 12° | 13° | 13° | 13° | 14° | 14° | 14° | 15° | 15° | 15° | 14° | 14° | 14° | 14° | 14° | 14° |
|
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WSW
14
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WSW
12
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WSW
12
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WSW
11
|
WSW
10
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WSW
9
|
WSW
9
|
SW
7
|
SW
6
|
SSW
6
|
SSW
8
|
SSW
10
|
SSW
11
|
SSW
11
|
SSW
11
|
SSW
11
|
SSW
10
|
S
8
|
S
8
|
S
8
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S
8
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S
8
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S
8
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S
6
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|
35 | 31 | 30 | 28 | 26 | 25 | 23 | 21 | 19 | 18 | 20 | 22 | 23 | 24 | 24 | 24 | 22 | 19 | 20 | 20 | 20 | 20 | 20 | 17 |
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VG | E | E | E | E | VG | VG | VG | VG | VG | VG | VG | VG | VG | VG | VG | VG | G | G | G | M | M | G | M |
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Humidity
|
82% | 81% | 79% | 77% | 78% | 78% | 79% | 79% | 80% | 82% | 80% | 74% | 70% | 69% | 69% | 69% | 71% | 75% | 81% | 86% | 89% | 92% | 93% | 94% |
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UV
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- | - | - | - | - | - | - | - | 1 | 1 | 1 | 2 | 2 | 2 | 2 | 1 | 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
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80% | 80% | 40% | 10% | <5% | <5% | <5% | <5% | <5% |
|
|
15°
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15°
|
14°
|
12°
|
14°
|
17°
|
17°
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14°
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11°
|
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15° | 14° | 13° | 11° | 13° | 15° | 15° | 13° | 10° |
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S
6
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S
7
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WNW
7
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WNW
7
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WNW
9
|
W
10
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W
11
|
W
7
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WNW
4
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15 | 16 | 16 | 16 | 19 | 21 | 22 | 14 | 9 |
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G | G | VG | VG | VG | VG | VG | VG | VG |
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Humidity
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95% | 95% | 93% | 91% | 83% | 64% | 61% | 75% | 88% |
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UV
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- | - | - | - | 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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Chance of precipitation
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<5% | 10% | 10% | 10% | <5% | 10% | 10% | 40% |
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10°
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8°
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9°
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13°
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16°
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17°
|
15°
|
15°
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9° | 8° | 8° | 12° | 14° | 15° | 14° | 13° |
|
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WNW
4
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WNW
3
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WNW
2
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SSE
4
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SSE
8
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S
10
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S
10
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S
11
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6 | 5 | 4 | 9 | 18 | 22 | 21 | 22 |
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G | M | M | G | VG | VG | G | G |
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Humidity
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94% | 97% | 98% | 90% | 73% | 69% | 80% | 89% |
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UV
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- | - | - | 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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Chance of precipitation
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50% | 50% | 50% | 40% | 30% | 10% | 10% | 10% |
|
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15°
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16°
|
15°
|
16°
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18°
|
18°
|
15°
|
14°
|
|
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14° | 14° | 14° | 15° | 16° | 16° | 15° | 13° |
|
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SSW
10
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SSW
10
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SW
9
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SW
10
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WSW
10
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WSW
10
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SW
7
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WSW
7
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21 | 21 | 19 | 20 | 22 | 21 | 15 | 13 |
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G | M | G | G | G | VG | G | G |
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Humidity
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92% | 94% | 95% | 91% | 81% | 74% | 85% | 91% |
|
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
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10% | 10% | 10% | 10% | 20% | 10% | 10% | 10% |
|
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13°
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13°
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13°
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15°
|
16°
|
16°
|
14°
|
13°
|
|
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13° | 13° | 12° | 14° | 15° | 15° | 13° | 12° |
|
|
WSW
6
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WSW
5
|
WSW
5
|
WSW
7
|
W
9
|
W
9
|
W
7
|
W
6
|
|
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12 | 10 | 10 | 14 | 19 | 19 | 14 | 12 |
|
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G | G | G | G | G | VG | VG | VG |
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Humidity
|
93% | 94% | 94% | 88% | 76% | 71% | 80% | 85% |
|
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% | <5% | 10% | 10% | 10% | 10% |
|
|
12°
|
11°
|
10°
|
13°
|
15°
|
16°
|
13°
|
11°
|
|
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11° | 10° | 9° | 12° | 14° | 14° | 12° | 11° |
|
|
W
6
|
WNW
6
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NW
5
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NNW
6
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NNW
7
|
W
7
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WNW
5
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WNW
4
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11 | 10 | 9 | 12 | 16 | 14 | 9 | 7 |
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G | G | G | VG | VG | VG | VG | G |
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Humidity
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89% | 90% | 92% | 83% | 67% | 64% | 78% | 86% |
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UV
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- | - | - | 2 | 3 | 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.
Mountain Ash weather map
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Wales weather forecast
Headline:
Becoming very windy on Wednesday with outbreaks of rain.
Today:
A settled start though winds soon strengthening with the arrival of Storm Agnes. Severe gales possible, especially along the coasts and hills, accompanied by outbreaks of heavy rain at times. Maximum temperature 20 °C.
Tonight:
Remaining very windy into the evening with further outbreaks of rain at times. Turning drier overnight to leave clearer intervals with winds gradually easing. Minimum temperature 12 °C.
Thursday:
Largely dry with the occasional bright spell and perhaps the odd shower, though still with a breeze around. Further rain arriving by the evening and overnight. Maximum temperature 19 °C.
Outlook for Friday to Sunday:
Mostly dry and settled with sunny spells on Friday and Saturday with the odd shower. Some rain overnight into Sunday then mostly dry. Breezy at times.
Updated:
UK long range weather forecast
Sunday will bring a day of sunshine and showers with brisk winds, strongest in the north, with lighter winds further south. This autumnal trend of changeable conditions is set to continue through the first half of this period. However, with time, it looks like we will see lengthier drier spells between Atlantic frontal systems later into the period, perhaps more so further south and east. By way of contrast, areas further north and west will probably remain more unsettled with occasional rain and stronger winds at times. There is a chance of a more widely settled spell towards the end of the period, potentially bringing drier conditions further north, Temperatures likely to be above average, with a chance of chilly nights accompanied by mist or fog patches in settled conditions.
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:
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