Castlerock Weather in September
What's the weather like in Castlerock (N Ireland) in September 2024?
The climate in Castlerock during September can be summarized as mild and damp.
September is in the fall / autumn in Castlerock and is typically the 4th warmest month of the year. Daytime maximum temperatures average around a cool 15°C (59°F), whilst at night 8°C (47°F) is normal.
| Daytime temperature | 15.2°C 59.4°F |
|---|---|
| Nightly temperature | 8.2°C 46.8°F |
| Average temperature | 11.7°C 53.1°F |
| Daily sunshine | 3.7 hrs |
| Avg rainfall | 109 mm 4.3 ins |
| Rainy days | 21 days |
| Sea temperature | 14°C 57.2°F |
| Humidity | 90% |
| Windspeed | 22kph 14 mph |
On average September is the 5th wettest month of the year in Castlerock with around 109mm 4.3 inches of rain making it a damp time to visit. This rainfall is typically spread over 21 days, although this may vary considerably.
On the flip side this corresponds to an average of 3.7 hours of sunshine per day.
September temperatures in Castlerock
September rainfall
September hourly sunshine
The data used in these monthly averages covers a period of over 100 years right up until last year. As such they are a valid prediction of what to expect for the weather in Castlerock in September 2024.
Other monthly averages
Best places to visit in September
Castlerock weather stats
| Hottest month: | July | 17.1°C 62.8°F |
|---|---|---|
| Driest month: | April | 69mm 2.7ins |
| Sunniest month: | May | 6.1hrs |
| Coldest month: | January | 6.2°C 43.2°F |
| Wettest month: | January | 128mm 5ins |
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