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Caernarfon Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Caernarfon.
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Climate overview of Caernarfon
Caernarfon, Gwynedd, United Kingdom, experiences moderate temperature changes through the seasons. July is the warmest month with daytime highs of 19°C (66°F), while January is the coolest at 9°C (48°F).
The city receives considerable rainfall, with around 1339 mm (53 in) annually. December is the wettest month. It has pleasant summers and cold winters. May is the sunniest month, averaging 5.6 hours of sunshine per day.
Caernarfon Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Caernarfon - and find the best time to visit.
Monthly Temperature in Caernarfon
In Caernarfon, seasonal changes bring about a moderate variation in temperatures. Typically, average maximum daytime temperatures range from a pleasant 19°C (66°F) in July to a chilly 9°C (48°F) in the coolest month, January.
Nights vary from 13°C (55°F) in July to around 4°C (39°F) during the colder months.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Caernarfon
Caernarfon has a relatively rainy climate with high precipitation levels, averaging 1339 mm (53 in) of rainfall annually. Caernarfon offers a pleasant mix of wetter and slightly drier months. The difference in precipitation between the wettest month December (144 mm (5.7 in)) and the driest month May (86 mm (3.4 in)) is not too significant. For more details, please visit our Caernarfon Precipitation page.
The mean monthly precipitation over the year, including rain, hail, and snow
The average number of days each month with precipitation
Sunshine Hours in Caernarfon
For those who appreciate different seasons, Caernarfon serves as an ideal destination. Expect longer, more sun-filled days in May with an average of 5.6 hours of sunshine daily, and embrace the darker days in December, offering only 0.9 hours of daily sunlight.
Visit our detailed sunshine hours page for more information.
Monthly hours of sunshine
Data from: Bala, the United Kingdom (51 KM, 32 Miles).
Daily hours of sunshine
Data from: Bala, the United Kingdom (51 KM, 32 Miles).
Best Time to Visit Caernarfon
For comfortable weather, consider visiting Caernarfon in July. Conditions are usually least favourable in January, February, March, November and December.
Monthly ratings reflect general weather comfort, based on daytime temperature and rainfall. Swimming and winter conditions are highlighted separately where relevant.
Jan
wet
Feb
wet
Mar
cold
Apr
mixed
May
good
Jun
good
Jul
very good
Aug
good
Sep
good
Oct
mixed
Nov
wet
Dec
wet
- Best overall: July
- Warmest weather: July, August and September
- Most sunshine: May
- Seasonal pattern: Pleasant summers and cold winters
Frequently asked questions about the climate in Caernarfon
What is the best time to visit Caernarfon?
July typically offers the most optimal weather in Caernarfon. In contrast, January, February, March, November and December tend to have less optimal conditions. Caernarfon has pleasant summers and cold winters.
What temperatures can I expect in Caernarfon?
Daytime highs range from 9°C (48°F) in January to 19°C (66°F) in July. Nighttime lows range from 4°C (39°F) to 13°C (55°F).
How much rain does Caernarfon get?
Annual rainfall is around 1339 mm (53 in). December is the wettest month with 144 mm (5.7 in), while May is the driest with 86 mm (3.4 in).
How sunny is Caernarfon?
Caernarfon receives around 1,192 hours of sunshine per year. May is the sunniest month with 169 hours, while December is the cloudiest with just 26 hours.
Caernarfon 3-Day Forecast
Caernarfon on the map
Caernarfon is highlighted - select any city to see its climate.
Popular in October
Where to go in October - average daytime high across popular destinations.
London
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