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 59°F 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 4.4 inches of rainfall in the month.

59
59°F max day temperature
3
3 hours of sunshine per day
20
20 days with some rainfall
48
48°F min night temperature
13
13 hours of daylight per day
0
No heat & humidity
4.4
4.4 inches of monthly rainfall
3
3 (Moderate) UV index
57
57°F sea temperature

More about Ballycastle

Ballycastle by month

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Recommended for Northern Ireland

Great Little Breaks: Fully flexible holiday deals

Sale

Check out latest deals on flexible holidays in the UK
Fully refundable up to 7 days before arrival
Fully amendable up to 72 hours before arrival

Go to Great Little Breaks deal >>

View all Great Little Breaks offers

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) | Imperial (°F)

More about the UK

How warm is it in Ballycastle in September?

Daytime temperatures usually reach 59°F in Ballycastle in September, falling to 48°F 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 57°F.

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 4.4 inches.

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.

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec