Coleraine weather in September 2025

Expect 16°C daytime maximum temperatures in the shade with on average 3 hours of sunshine per day in Coleraine in September. Check more long-term weather averages for Coleraine in September before you book your next holiday to Northern Ireland in 2025/2026.

  • 16°C maximum daytime temperature in September in Coleraine16
    16°C max day temperature
  • 3 hours of sunshine per day
  • 20 days with some rainfall in September in Coleraine20
    20 days with some rainfall
  • 9°C minimum night-time temperature in September in Coleraine9
    9°C min night temperature
  • 13 hours of daylight per day in September in Coleraine13
    13 hours of daylight per day
  • No heat & humidity in September in Coleraine0
    No heat & humidity
  • 97 mm monthly rainfall in September in Coleraine97
    97 mm of monthly rainfall
  • UV (maximum) index 3 (Moderate) in September in Coleraine3
    3 (Moderate) UV index

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

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

How sunny is it in Coleraine in September?

There are normally 3 hours of bright sunshine each day in Coleraine in September - that's 26% of daylight hours.

Does it rain in Coleraine in September?

There are usually 20 days with some rain in Coleraine in September and the average monthly rainfall is 97mm.

Coleraine September sunrise & sunset times

Browse the sunrise and sunset times for Coleraine in September 2025. Select a month to view Coleraine sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 05:33 19:19
Monday, 15th September 2025 05:59 18:43
Tuesday, 30th September 2025 06:28 18:04

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