Castlerock Weather in September

During September, Castlerock experiences moderate daytime temperatures of 16°C (61°F) and cooler nights around 12°C (54°F). Expect quite a bit of rainfall. Around 106 mm (4.2 in) is typical.

Rainfall in Castlerock in September

Expect around 21 days of rain based on historical data, with 106 mm (4.2 in) average. Expect frequent rainfall this month, and not just light drizzle. When it rains, it tends to come down hard.

Temperature in Castlerock in September

Temperatures in Castlerock in September top out at 16°C (61°F) and drop to 12°C (54°F) overnight. A light jacket or extra layer can be useful, especially outside the warmest hours of the day. With lows of 12°C (54°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 Castlerock in September

The area enjoys a balanced 118 hours of sunlight, ensuring it's neither too overcast nor too sunny.

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