Bangor weather in September 2025

Expect 16°C daytime maximum temperatures in the shade with on average 4 hours of sunshine per day in Bangor in September. Check more long-term weather averages for Bangor in September before you book your next holiday to Northern Ireland in 2025/2026.

  • 16°C maximum daytime temperature in September in Bangor16
    16°C max day temperature
  • 4 hours of sunshine per day
  • 17 days with some rainfall in September in Bangor17
    17 days with some rainfall
  • 9°C minimum night-time temperature in September in Bangor9
    9°C min night temperature
  • 13 hours of daylight per day in September in Bangor13
    13 hours of daylight per day
  • No heat & humidity in September in Bangor0
    No heat & humidity
  • 88 mm monthly rainfall in September in Bangor88
    88 mm of monthly rainfall
  • UV (maximum) index 3 (Moderate) in September in Bangor3
    3 (Moderate) UV index
  • 14°C sea temperature in September in Bangor14
    14°C sea temperature

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

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

How sunny is it in Bangor in September?

There are normally 4 hours of bright sunshine each day in Bangor in September - that's 30% of daylight hours.

How warm is the sea around Bangor in September?

The average sea temperature around Bangor in September is 14°C.

Does it rain in Bangor in September?

There are usually 17 days with some rain in Bangor in September and the average monthly rainfall is 88mm.

Bangor September sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 05:30 19:14
Monday, 15th September 2025 05:56 18:39
Tuesday, 30th September 2025 06:23 18:01

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