Caernarfon Weather in May
What's the weather like in Caernarfon (Wales) in May 2025?
The climate in Caernarfon during May can be summarized as mild and a little damp.
May is in the spring in Caernarfon and is typically the 6th warmest month of the year. Daytime maximum temperatures average around a cool 14°C (57°F), whilst at night 7°C (44°F) is normal.
| Daytime temperature | 14.1°C 57.3°F |
|---|---|
| Nightly temperature | 6.6°C 43.8°F |
| Average temperature | 10.3°C 50.5°F |
| Daily sunshine | 6.9 hrs |
| Avg rainfall | 90 mm 3.5 ins |
| Rainy days | 16 days |
| Sea temperature | 10.2°C 50.4°F |
| Humidity | 81% |
| Windspeed | 18kph 11 mph |
On average May is the driest month of the year in Caernarfon with around 90mm 3.5 inches of rain making it a a little 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 6.9 hours of sunshine per day.
May temperatures in Caernarfon
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 Caernarfon in May 2025.
Other monthly averages
Caernarfon weather stats
| Hottest month: | July | 17.9°C 64.2°F |
|---|---|---|
| Driest month: | May | 90mm 3.5ins |
| Sunniest month: | May | 6.9hrs |
| Coldest month: | February | 6.6°C 43.9°F |
| Wettest month: | November | 184mm 7.2ins |
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