Castlerock weather in September (Londonderry County, United Kingdom)

What should you pack for a trip to Castlerock in September? See what weather conditions to anticipate this month with our guide.

Temperatures

In September, the weather in Castlerock generally includes moderate temperatures and high rainfall. Expect daytime highs to reach approximately 16°C, with nighttime lows dipping to around 12°C.

Precipitation

Castlerock in September usually receives high rainfall, averaging around 106 mm for the month. Analyzing past climate data, one can expect approximately 21 days of rain.

Average sunshine

The month experiences a moderate amount of sunlight, with 118 hours hours. A nice balance between sunshine and clouds.

If you prefer dry days with pleasant temperatures, June typically offers the best circumstances. While January, February, March, November and December tend to showcase less optimal conditions.

For an in-depth look at the yearly conditions, visit our specialized Castlerock climate page with graphs.

 

Castlerock, monthly averages in September

Min Temperature 12°C  

Max Temperature 16°C  

Chance of Rain 68%  

Precipitation 106 mm  

Rainy days 21 days  

Sunshine 118 hours *  

Percentage Sunshine *  

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

Where to go in the United Kingdom in September

Find out more about the weather in the United Kingdom and which places have the best travel conditions in this month.

Weather conditions Weather

Temperatures

Precipitation

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Legend perfect weather pleasant tolerable unpleasant poor

Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C and 29°C and not too much precipitation (less than 90 mm a month).

So, what should you wear in this month?

For visitors traveling to Castlerock, we recommend wearing layers. So maybe a skirt, t-shirt, shorts for during the day and jeans and a warm jacket for some days and evenings. Bring a rain jacket in case it rains during your stay. Plan on layering your clothes.

What To Do

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

Interested in more climate information?

This site provides you with all the information you need about the climate in Castlerock.

Our site offers climate and forecast data for every country in the world. Are you going to the United Kingdom? On this website you can find historical weather averages for many cities in the United Kingdom. Not sure yet where to go? We now have a tool which recommends destinations that suit your ideal travel conditions. Find out where to go with our weather planner.