Llantwit Major Weather in December
What's the weather like in Llantwit Major (Wales) in December 2025?
The climate in Llantwit Major during December can be summarized as cool and damp.
December is in the winter in Llantwit Major and is typically the 3rd coldest month of the year. Daytime maximum temperatures average around a cool 8°C (47°F), whilst at night 3°C (38°F) is normal.
| Daytime temperature | 8.4°C 47°F |
|---|---|
| Nightly temperature | 3.1°C 37.5°F |
| Average temperature | 5.7°C 42.3°F |
| Daily sunshine | 1.8 hrs |
| Avg rainfall | 109 mm 4.3 ins |
| Rainy days | 20 days |
| Sea temperature | 11.6°C 52.9°F |
| Humidity | 92% |
| Windspeed | 19.8kph 12 mph |
On average December is the 2nd wettest month of the year in Llantwit Major with around 109mm 4.3 inches of rain making it a damp time to visit. This rainfall is typically spread over 20 days, although this may vary considerably.
On the flip side this corresponds to an average of 1.8 hours of sunshine per day.
December temperatures in Llantwit Major
December rainfall
December 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 Llantwit Major in December 2025.
Other monthly averages
Best places to visit in December
Llantwit Major weather stats
| Hottest month: | July | 19.9°C 67.8°F |
|---|---|---|
| Driest month: | April | 59mm 2.3ins |
| Sunniest month: | August | 6.4hrs |
| Coldest month: | February | 7.1°C 44.8°F |
| Wettest month: | November | 109mm 4.3ins |
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