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.

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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 Castlerock's climate page.

Castlerock Temperature in September

Min Temperature 12°C (54°F)  

Max Temperature 16°C (61°F)  

Chance of Rain 68%  

Precipitation 106 mm (4.2 in)  

Rainy days 21 days  

Sunshine 118 hours *  

Percentage Sunshine *  

* Data from: Derry, Ireland (38 KM, 23 Miles).

What to Wear in Castlerock 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 Castlerock in September

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

Swimming

5/10

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 Castlerock's climate page.

More climate data for Castlerock

Temperature Rainfall Sunshine

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