Coleraine weather in September 2026

Q: How warm is it in Coleraine in September?

Daytime temperatures usually reach 16°C in Coleraine in September, falling to 9°C at night.

Q: How sunny is it in Coleraine in September?

There are normally 4 hours of bright sunshine each day in Coleraine in September - that's 30% of daylight hours.

Q: How warm is the sea around Coleraine in September?

The average sea temperature around Coleraine in September is 14°C.

Q: Does it rain in Coleraine in September?

There are usually 17 days with some rain in Coleraine in September and the average monthly rainfall is 94mm.

Expect daytime maximum temperatures of 16°C in Coleraine, Northern Ireland in September based on long-term weather averages. There are 3 hours of sunshine per day on average with 20 days with some rainfall and typically 97 mm of rainfall in the month.

16
16°C max day temperature
3
3 hours of sunshine per day
20
20 days with some rainfall
9
9°C min night temperature
13
13 hours of daylight per day
0
No heat & humidity
97
97 mm of monthly rainfall
3
3 (Moderate) UV index

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The September weather guide for Northern Ireland (Coleraine) shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

Metric (°C / mm) | Imperial (°F / inches)

More about the UK

How warm is it in Coleraine in September?

Daytime temperatures usually reach 16°C in Coleraine in September, falling to 9°C at night.

How sunny is it in Coleraine in September?

There are normally 4 hours of bright sunshine each day in Coleraine in September - that's 30% of daylight hours.

How warm is the sea around Coleraine in September?

The average sea temperature around Coleraine in September is 14°C.

Does it rain in Coleraine in September?

There are usually 17 days with some rain in Coleraine in September and the average monthly rainfall is 94mm.

Coleraine September sunrise & sunset times

Browse the sunrise and sunset times for Coleraine in September 2026. Select a month to view Coleraine sunrise and sunset times for the next 12 months.

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