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.