Ballycastle weather in September 2026

Q: How warm is it in Ballycastle in September?

Daytime temperatures usually reach 15°C in Ballycastle in September, falling to 9°C at night.

Q: How sunny is it in Ballycastle in September?

There are normally 3 hours of bright sunshine each day in Ballycastle in September - that's 27% of daylight hours.

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

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

Q: Does it rain in Ballycastle in September?

There are usually 20 days with some rain in Ballycastle in September and the average monthly rainfall is 113mm.

Expect daytime maximum temperatures of 15°C in Ballycastle, 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 113 mm of rainfall in the month.

15
15°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
113
113 mm of monthly rainfall
3
3 (Moderate) UV index
14
14°C sea temperature

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The September weather guide for Northern Ireland (Ballycastle) 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 Ballycastle in September?

Daytime temperatures usually reach 15°C in Ballycastle in September, falling to 9°C at night.

How sunny is it in Ballycastle in September?

There are normally 3 hours of bright sunshine each day in Ballycastle in September - that's 27% of daylight hours.

How warm is the sea around Ballycastle in September?

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

Does it rain in Ballycastle in September?

There are usually 20 days with some rain in Ballycastle in September and the average monthly rainfall is 113mm.

Ballycastle September sunrise & sunset times

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

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