Ballycastle weather in September 2025

Expect 59°F 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.

  • 59°F maximum daytime temperature in September in Ballycastle59
    59°F max day temperature
  • 3 hours of sunshine per day
  • 20 days with some rainfall in September in Ballycastle20
    20 days with some rainfall
  • 48°F minimum night-time temperature in September in Ballycastle48
    48°F min night temperature
  • 13 hours of daylight per day in September in Ballycastle13
    13 hours of daylight per day
  • No heat & humidity in September in Ballycastle0
    No heat & humidity
  • 4.4 inches monthly rainfall in September in Ballycastle4.4
    4.4 inches of monthly rainfall
  • UV (maximum) index 3 (Moderate) in September in Ballycastle3
    3 (Moderate) UV index
  • 57°F sea temperature in September in Ballycastle57
    57°F 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)  |  Imperial (°F)

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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 2025. Select a month to view Ballycastle sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 05:31 19:17
Monday, 15th September 2025 05:58 18:42
Tuesday, 30th September 2025 06:26 18:03

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