Caernarfon Weather in September

September in Caernarfon sees daytime temperatures around 18°C (64°F) and lows of 11°C (52°F) at night. With around 109 mm (4.3 in) of rainfall expected, it's worth packing a rain jacket.

Rainfall in Caernarfon in September

Rain is expected on roughly 17 days, totalling around 109 mm (4.3 in) for the month. This is a wet month with frequent and often heavy showers. Both the number of rain days and the total rainfall are high.

Temperature in Caernarfon in September

September in Caernarfon sees highs of 18°C (64°F) and lows of 11°C (52°F) overnight. September is typically considered a summer month. This creates a mild day-to-night pattern that is generally easy to manage with the right clothing. With lows of 11°C (52°F), nights are cool. If you're out after dark, an extra layer will keep you comfortable. The cooler air at night is also great for getting a good rest.

Sunshine in Caernarfon in September

The city usually sees around 111 hours of sunlight, indicating a moderately sunny period.

If your ideal day consists of dry skies and pleasant temperatures, July typically offers the best circumstances for Caernarfon.

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For a detailed overview over the year and the best time to visit the United Kingdom, check out our Caernarfon's climate page.

Caernarfon Temperature in September

Min Temperature 11°C (52°F)  

Max Temperature 18°C (64°F)  

Chance of Rain 56%  

Precipitation 109 mm (4.3 in)  

Rainy days 17 days  

Sunshine 111 hours *  

Percentage Sunshine *  

* Data from: Bala, the United Kingdom (51 KM, 32 Miles).

What to Wear in Caernarfon in September

Comfortable temperatures call for an easy wardrobe in September. Pack summer basics like t-shirts and shorts, but include a light jacket for cooler moments. A pair of comfortable walking shoes is essential. Expect heavy rainfall, so bring good rain protection and waterproof bags. Bring sunglasses since you'll have some sunny periods throughout the month

What To Do in Caernarfon in September

We rated the following activities from 1 (least suitable) to 10 (best) to do.

Swimming

6/10

Cycling

5/10

Walking

5/10

Camping

6/10

Outdoor sports

9/10

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit the United Kingdom, check out our Caernarfon's climate page.

More climate data for Caernarfon

Temperature Rainfall Sunshine

See the full Caernarfon climate overview or explore weather in the United Kingdom.