Llanberis Weather in September

During September, Llanberis experiences moderate daytime temperatures of 17°C (63°F) and cooler nights around 11°C (52°F). Expect quite a bit of rainfall. Around 108 mm (4.3 in) is typical.

Rainfall in Llanberis in September

This month experiences about 17 days of rain according to historical data, averaging 108 mm (4.3 in). 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 Llanberis in September

Expect highs of 17°C (63°F) in Llanberis in September, with nights dropping to around 11°C (52°F). The difference between afternoon and evening temperatures is usually noticeable. At 11°C (52°F) overnight, it can feel quite a bit cooler after dark. Worth packing something warmer for evenings, but the cooler temperatures are ideal for sleeping.

Sunshine in Llanberis in September

The area enjoys a balanced 111 hours of sunlight, ensuring it's neither too overcast nor too sunny.

Should you favor a climate that's both dry and comfortably warm, June and July typically offer the most agreeable circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.