Caernarfon Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Caernarfon.
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 February 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. 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, February.
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
Daily hours of sunshine
Best Time to Visit Caernarfon
Rainfall during this time ranges from 94 mm (3.7 in) in July to 109 mm (4.3 in) in September. This means you can expect a mix of sunny days and occasional showers. Wondering where to travel based on your weather preferences? Our recommendation tool helps you find destinations with your ideal climate conditions. Use our weather planner to find your perfect destination.
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.
What temperatures can I expect in Caernarfon?
Daytime highs range from 9°C (48°F) in February 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 3-Day Forecast
Caernarfon on the map
Caernarfon is highlighted — select any city to see its climate.
Popular this month
Where to go in July — average daytime high across popular destinations.
London
23°C (73°F) Bath22°C (72°F) York22°C (72°F) Manchester
21°C (70°F) Edinburgh
19°C (66°F) Glasgow19°C (66°F) Torquay20°C (68°F) Blackpool19°C (66°F) 
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