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Thunderstorms and heatwave conditions
Thunderstorm warnings continue across much of the UK until Monday, 17th August, with a risk of impacts from heavy rain, flash flooding, lightning and hail.
Read moreTreharris (Merthyr Tydfil) weather
Find a forecast
Forecast days
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Today. Maximum daytime temperature: 17 degrees Celsius; Minimum nighttime temperature: 16 degrees Celsius. Heavy rain changing to cloudy by early evening. Sunrise: 05:59; Sunset: 20:35. UV: Moderate; Pollution: Low; Pollen: Moderate.
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Sunday 16 August. Maximum daytime temperature: 21 degrees Celsius; Minimum nighttime temperature: 15 degrees Celsius. Drizzle changing to cloudy by late morning. Sunrise: 06:01; Sunset: 20:33. UV: Moderate; Pollution: Low; Pollen: Moderate.
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Monday 17 August. Maximum daytime temperature: 19 degrees Celsius; Minimum nighttime temperature: 15 degrees Celsius. Light showers changing to partly cloudy by nighttime. Sunrise: 06:02; Sunset: 20:31. UV: Moderate; Pollution: Low; Pollen: Moderate.
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Tuesday 18 August. Maximum daytime temperature: 20 degrees Celsius; Minimum nighttime temperature: 14 degrees Celsius. Cloudy changing to sunny intervals by late morning. Sunrise: 06:04; Sunset: 20:29. UV: High; Pollution: Low; Pollen: Moderate.
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Wednesday 19 August. Maximum daytime temperature: 20 degrees Celsius; Minimum nighttime temperature: 15 degrees Celsius. Cloudy changing to light rain in the afternoon. Sunrise: 06:06; Sunset: 20:27. UV: Moderate; Pollution: Low; Pollen: High.
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Thursday 20 August. Maximum daytime temperature: 20 degrees Celsius; Minimum nighttime temperature: 15 degrees Celsius. Heavy showers. Sunrise: 06:07; Sunset: 20:25. UV: Moderate;
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Friday 21 August. Maximum daytime temperature: 19 degrees Celsius; Minimum nighttime temperature: 14 degrees Celsius. Light showers changing to cloudy by nighttime. Sunrise: 06:09; Sunset: 20:23. UV: Moderate;
Seven day forecast for Treharris
Today (15 August 2020)
| Time | Now | 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% | 20% | 80% | 60% | 50% | 50% | 50% | 50% | 20% | 10% | 10% | 10% | 20% | 30% | 30% |
| Temperature (°C) |
15°
|
15°
|
15°
|
15°
|
16°
|
15°
|
16°
|
16°
|
16°
|
17°
|
17°
|
17°
|
17°
|
17°
|
17°
|
| Feels like temperature (°C) | 14° | 14° | 14° | 14° | 14° | 14° | 15° | 15° | 16° | 16° | 17° | 17° | 17° | 17° | 17° |
| Wind direction and speed (miles per hour) |
ENE
9
|
ENE
7
|
ENE
8
|
ENE
8
|
ENE
9
|
ENE
8
|
ENE
7
|
ENE
7
|
ENE
6
|
NE
7
|
NE
6
|
NE
5
|
NE
5
|
NE
5
|
NE
5
|
| Wind gust (miles per hour) | 19 | 18 | 19 | 18 | 19 | 18 | 17 | 16 | 14 | 14 | 13 | 12 | 12 | 11 | 11 |
| Visibility | VP | M | M | M | G | G | M | G | VG | G | VG | G | G | P | P |
| Humidity | 96% | 93% | 92% | 92% | 90% | 89% | 92% | 90% | 90% | 89% | 89% | 91% | 93% | 95% | 95% |
| UV | 2 | 2 | 3 | 4 | 4 | 4 | 3 | 2 | 2 | 1 | 1 | 1 | - | - | - |
Sunday (16 August 2020)
| 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 | 40% | 30% | 30% | 30% | 30% | 30% | 30% | 30% | 30% | 10% | 10% | 20% | 30% | 30% | 30% | 30% | 50% | 30% | 30% | 30% | 30% | 30% | 30% | 30% |
| Temperature (°C) |
17°
|
16°
|
16°
|
16°
|
16°
|
16°
|
16°
|
16°
|
16°
|
17°
|
17°
|
18°
|
19°
|
20°
|
20°
|
21°
|
20°
|
20°
|
20°
|
19°
|
18°
|
17°
|
17°
|
17°
|
| Feels like temperature (°C) | 17° | 17° | 16° | 16° | 16° | 16° | 16° | 16° | 16° | 17° | 18° | 18° | 19° | 20° | 21° | 21° | 20° | 20° | 20° | 20° | 19° | 18° | 18° | 17° |
| Wind direction and speed (miles per hour) |
NE
5
|
NE
5
|
NE
5
|
NE
5
|
NE
6
|
NE
5
|
NE
5
|
ENE
5
|
ENE
6
|
E
6
|
E
6
|
E
6
|
ESE
5
|
E
6
|
E
4
|
ESE
6
|
SE
5
|
SE
4
|
SSE
4
|
SSE
4
|
SE
3
|
NE
3
|
N
3
|
NNE
4
|
| Wind gust (miles per hour) | 11 | 11 | 11 | 11 | 12 | 12 | 12 | 11 | 11 | 11 | 10 | 11 | 11 | 11 | 10 | 11 | 11 | 9 | 9 | 7 | 7 | 6 | 6 | 6 |
| Visibility | M | VP | VP | VP | VP | VP | VP | P | P | M | M | M | G | G | G | G | G | G | G | G | G | G | G | G |
| Humidity | 95% | 96% | 97% | 97% | 97% | 97% | 97% | 97% | 96% | 93% | 92% | 90% | 85% | 81% | 78% | 74% | 75% | 77% | 77% | 80% | 85% | 90% | 92% | 92% |
| UV | - | - | - | - | - | - | - | 1 | 1 | 1 | 2 | 3 | 4 | 5 | 5 | 4 | 3 | 2 | 1 | 1 | 1 | - | - | - |
Monday (17 August 2020)
| 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 | 30% | 30% | 30% | 40% | 60% | 50% | 70% | 60% | 10% |
| Temperature (°C) |
16°
|
16°
|
15°
|
15°
|
17°
|
18°
|
18°
|
18°
|
16°
|
| Feels like temperature (°C) | 16° | 16° | 16° | 16° | 17° | 18° | 18° | 17° | 15° |
| Wind direction and speed (miles per hour) |
NNE
3
|
NNW
3
|
WSW
3
|
W
3
|
NW
4
|
SSW
7
|
W
8
|
W
7
|
WSW
5
|
| Wind gust (miles per hour) | 6 | 7 | 6 | 6 | 9 | 14 | 17 | 14 | 10 |
| Visibility | G | M | P | M | G | G | G | G | G |
| Humidity | 94% | 95% | 97% | 96% | 90% | 81% | 81% | 85% | 94% |
| UV | - | - | - | 1 | 3 | 4 | 3 | 1 | - |
Tuesday (18 August 2020)
| 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% | 20% | 10% | 40% | 40% | 30% | <5% |
| Temperature (°C) |
15°
|
15°
|
15°
|
17°
|
19°
|
19°
|
18°
|
16°
|
| Feels like temperature (°C) | 15° | 15° | 15° | 16° | 17° | 17° | 17° | 15° |
| Wind direction and speed (miles per hour) |
WSW
6
|
WSW
5
|
SW
6
|
WSW
9
|
WSW
10
|
WSW
11
|
WSW
10
|
WSW
6
|
| Wind gust (miles per hour) | 12 | 11 | 12 | 18 | 23 | 24 | 19 | 12 |
| Visibility | G | G | M | G | G | G | G | G |
| Humidity | 95% | 95% | 95% | 88% | 78% | 76% | 81% | 93% |
| UV | - | - | 1 | 3 | 6 | 3 | 1 | - |
Wednesday (19 August 2020)
| 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% | 20% | 50% | 80% | 80% |
| Temperature (°C) |
15°
|
15°
|
15°
|
17°
|
18°
|
19°
|
18°
|
17°
|
| Feels like temperature (°C) | 15° | 14° | 15° | 16° | 17° | 17° | 16° | 15° |
| Wind direction and speed (miles per hour) |
WSW
5
|
SW
4
|
SSW
4
|
S
7
|
S
10
|
S
12
|
SSE
12
|
SSE
12
|
| Wind gust (miles per hour) | 9 | 8 | 8 | 16 | 22 | 25 | 24 | 24 |
| Visibility | G | M | M | G | G | G | G | M |
| Humidity | 95% | 97% | 96% | 87% | 77% | 76% | 87% | 93% |
| UV | - | - | 1 | 3 | 4 | 2 | 1 | - |
Thursday (20 August 2020)
| Time | 01:00 | 04:00 | 07:00 | 10:00 | 13:00 | 16:00 | 19:00 | 22:00 |
|---|---|---|---|---|---|---|---|---|
| Weather symbol |
|
|
|
|
|
|
|
|
| Chance of precipitation | 80% | 60% | 60% | 40% | 40% | 40% | 40% | 30% |
| Temperature (°C) |
17°
|
17°
|
16°
|
17°
|
19°
|
19°
|
18°
|
16°
|
| Feels like temperature (°C) | 15° | 15° | 14° | 15° | 16° | 16° | 15° | 14° |
| Wind direction and speed (miles per hour) |
S
13
|
S
12
|
SSW
12
|
SSW
15
|
SSW
17
|
SSW
17
|
SSW
14
|
SSW
13
|
| Wind gust (miles per hour) | 26 | 23 | 23 | 30 | 34 | 33 | 28 | 25 |
| Visibility | M | M | G | G | G | VG | VG | G |
| Humidity | 94% | 95% | 94% | 84% | 72% | 72% | 78% | 88% |
| UV | - | - | 1 | 3 | 5 | 3 | 1 | - |
Friday (21 August 2020)
| Time | 01:00 | 04:00 | 07:00 | 10:00 | 13:00 | 16:00 | 19:00 | 22:00 |
|---|---|---|---|---|---|---|---|---|
| Weather symbol |
|
|
|
|
|
|
|
|
| Chance of precipitation | 30% | 20% | 40% | 40% | 40% | 40% | 40% | 20% |
| Temperature (°C) |
15°
|
15°
|
15°
|
17°
|
18°
|
18°
|
17°
|
16°
|
| Feels like temperature (°C) | 13° | 13° | 13° | 14° | 15° | 15° | 15° | 14° |
| Wind direction and speed (miles per hour) |
SSW
13
|
SSW
13
|
SSW
13
|
SSW
17
|
SW
19
|
SW
18
|
SW
15
|
SW
13
|
| Wind gust (miles per hour) | 26 | 26 | 27 | 33 | 38 | 37 | 30 | 25 |
| Visibility | G | G | G | G | G | G | G | G |
| Humidity | 91% | 92% | 92% | 87% | 79% | 78% | 85% | 91% |
| UV | - | - | 1 | 3 | 5 | 2 | 1 | - |
Wales weather forecast
Headline:
Sunny spells in the north, showers in the south.
Today:
A rather cloudy start across many parts of Wales, with showers affecting the southern half of Wales. Across the northern half of Wales early cloud will clear and it will stay dry with warm sunny spells. Maximum temperature 23 °C.
Tonight:
The cloud and showers in the south will spread northwards through the evening and overnight, with the showers possibly turning heavy and thundery at times. Mild with light winds. Minimum temperature 12 °C.
Sunday:
A cloudy start to the day with showers turning thundery at times. Sunny spells developing in the south for the afternoon. Staying warm and muggy with light winds. Maximum temperature 24 °C.
Outlook for Monday to Wednesday:
Thundery showers and sunny spells on Monday and Tuesday. Less humid on Wednesday with a few light showers and sunny spells.
Updated:
UK long range weather forecast
The beginning of this period is likely to be generally unsettled with showers and longer spells of rain at times, potentially becoming heavy in places. There is also a chance that there could be some further thundery weather, although this would most likely be confined towards the east and southeast of the UK. It is likely to be windier than of late, especially in the south and west where there is also a risk of gales. Temperatures should start rather warm for many, despite the spells of unsettled weather. However, temperatures may cool slightly by the end of this period with freshening winds from the northwest likely to create a more widespread risk of gales.
Updated:
Although confidence is low for this period, it is likely that conditions will become more changeable with drier and brighter days interspersed with periods of rain and strengthening winds. Temperatures should be around the average for this time of year. Towards the end of this period, there are some tentative signs that high pressure could begin to dominate, especially across the south of the UK, with a return to more settled conditions.
Updated:
