Merthyr Tydfil Weather in August
What's the weather like in Merthyr Tydfil (Wales) in August 2025?
The climate in Merthyr Tydfil during August can be summarized as mild and wet.
August is in the summer in Merthyr Tydfil and is typically the 2nd warmest month of the year. Daytime maximum temperatures average around 18°C (65°F), whilst at night 11°C (51°F) is normal.
| Daytime temperature | 18.2°C 64.8°F |
|---|---|
| Nightly temperature | 10.6°C 51.1°F |
| Average temperature | 14.4°C 57.9°F |
| Daily sunshine | 5.8 hrs |
| Avg rainfall | 123 mm 4.9 ins |
| Rainy days | 16 days |
| Sea temperature | 16.2°C 61.2°F |
| Humidity | 86% |
| Windspeed | 15.8kph 10 mph |
On average August is the 5th driest month of the year in Merthyr Tydfil with around 123mm 4.9 inches of rain making it a wet time to visit. This rainfall is typically spread over 16 days, although this may vary considerably.
On the flip side this corresponds to an average of 5.8 hours of sunshine per day.
August temperatures in Merthyr Tydfil
August rainfall
August hourly sunshine
The data used in these monthly averages covers a period of over 100 years right up until last year. As such they are a valid prediction of what to expect for the weather in Merthyr Tydfil in August 2025.
Other monthly averages
Best places to visit in August
Merthyr Tydfil weather stats
| Hottest month: | July | 18.3°C 64.9°F |
|---|---|---|
| Driest month: | July | 93mm 3.7ins |
| Sunniest month: | June | 6.6hrs |
| Coldest month: | February | 5.2°C 41.4°F |
| Wettest month: | December | 212mm 8.3ins |
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