Merthyr Tydfil Weather in July
What's the weather like in Merthyr Tydfil (Wales) in July 2025?
The climate in Merthyr Tydfil during July can be summarized as mild and a little damp.
July is in the summer in Merthyr Tydfil and is typically the warmest month of the year. Daytime maximum temperatures average around 19°C (65°F), whilst at night 11°C (51°F) is normal.
| Daytime temperature | 18.5°C 65.3°F |
|---|---|
| Nightly temperature | 10.5°C 50.9°F |
| Average temperature | 14.5°C 58.1°F |
| Daily sunshine | 6 hrs |
| Avg rainfall | 93 mm 3.7 ins |
| Rainy days | 14 days |
| Sea temperature | 15.1°C 59.1°F |
| Humidity | 85% |
| Windspeed | 15.5kph 10 mph |
On average July is the driest month of the year in Merthyr Tydfil with around 93mm 3.7 inches of rain making it a a little damp time to visit. This rainfall is typically spread over 14 days, although this may vary considerably.
On the flip side this corresponds to an average of 6 hours of sunshine per day.
July temperatures in Merthyr Tydfil
July rainfall
July 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 July 2025.
Other monthly averages
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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