Ballycastle weather in September 2026

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°C maximum daytime temperature in September in Ballycastle15
    15°C max day temperature
  • 3 hours of sunshine per day
  • 20 days with some rainfall in September in Ballycastle20
    20 days with some rainfall
  • 9°C minimum night-time temperature in September in Ballycastle9
    9°C 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
  • 113 mm monthly rainfall in September in Ballycastle113
    113 mm of monthly rainfall
  • UV (maximum) index 3 (Moderate) in September in Ballycastle3
    3 (Moderate) UV index
  • 14°C sea temperature in September in Ballycastle14
    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)

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More about the UK

How warm is it in Ballycastle in September?

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

How sunny is it in Ballycastle in September?

There are normally 4 hours of bright sunshine each day in Ballycastle in September - that's 30% 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 17 days with some rain in Ballycastle in September and the average monthly rainfall is 94mm.

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.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Tuesday, 1st September 2026 05:31 19:18
Tuesday, 15th September 2026 05:57 18:42
Wednesday, 30th September 2026 06:25 18:03

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