Merthyr Tydfil Weather in May
What's the weather like in Merthyr Tydfil (Wales) in May 2025?
The climate in Merthyr Tydfil during May can be summarized as cool and damp.
May is in the spring in Merthyr Tydfil and is typically the 5th warmest month of the year. Daytime maximum temperatures average around a cool 14°C (57°F), whilst at night 6°C (42°F) is normal.
| Daytime temperature | 13.8°C 56.8°F |
|---|---|
| Nightly temperature | 5.8°C 42.4°F |
| Average temperature | 9.8°C 49.6°F |
| Daily sunshine | 6.1 hrs |
| Avg rainfall | 106 mm 4.2 ins |
| Rainy days | 16 days |
| Sea temperature | 11.2°C 52.2°F |
| Humidity | 83% |
| Windspeed | 16.9kph 11 mph |
On average May is the 4th driest month of the year in Merthyr Tydfil with around 106mm 4.2 inches of rain making it a damp 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 6.1 hours of sunshine per day.
May temperatures in Merthyr Tydfil
May rainfall
May 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 May 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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