Ballycastle weather in September 2025

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 15°C daytime maximum temperatures in the shade with on average 3 hours of sunshine per day in Ballycastle in September. Check more long-term weather averages for Ballycastle in September before you book your next holiday to Northern Ireland in 2025/2026.

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

More about Ballycastle

Ballycastle by month

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

Recommended for Northern Ireland

National Trust Holidays: up to 35% off 10+ night stays

Discount Code

Save up to 35% on 10+ night stays with National Trust Holidays
Discover breaks to Cornwall, Devon , Wales & Nothern Ireland
Stay between 1 Oct & 30 Nov or 1 Jan & 28 Feb 2025

Show discount code

******NAF

Redeem National Trust Holidays discount code >>

Expires at 23:59 on Friday 28th Feb 2025 · View all National Trust Holidays 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 / 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 2025. 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