Caernarfon Weather in July
What's the weather like in Caernarfon (Wales) in July 2025?
The climate in Caernarfon during July can be summarized as mild and a little damp.
July is in the summer in Caernarfon and is typically the 2nd warmest month of the year. Daytime maximum temperatures average around 18°C (65°F), whilst at night 11°C (52°F) is normal.
| Daytime temperature | 18.1°C 64.6°F |
|---|---|
| Nightly temperature | 11.1°C 52°F |
| Average temperature | 14.6°C 58.3°F |
| Daily sunshine | 6 hrs |
| Avg rainfall | 99 mm 3.9 ins |
| Rainy days | 14 days |
| Sea temperature | 14.5°C 58°F |
| Humidity | 84% |
| Windspeed | 16.6kph 10 mph |
On average July is the 4th driest month of the year in Caernarfon with around 99mm 3.9 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 Caernarfon
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 Caernarfon in July 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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