Antrim weather in September 2025

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

  • 16°C maximum daytime temperature in September in Antrim16
    16°C max day temperature
  • 4 hours of sunshine per day
  • 19 days with some rainfall in September in Antrim19
    19 days with some rainfall
  • 8°C minimum night-time temperature in September in Antrim8
    8°C min night temperature
  • 13 hours of daylight per day in September in Antrim13
    13 hours of daylight per day
  • No heat & humidity in September in Antrim0
    No heat & humidity
  • 91 mm monthly rainfall in September in Antrim91
    91 mm of monthly rainfall
  • UV (maximum) index 3 (Moderate) in September in Antrim3
    3 (Moderate) UV index

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

Daytime temperatures usually reach 16°C in Antrim in September, falling to 8°C at night.

How sunny is it in Antrim in September?

There are normally 4 hours of bright sunshine each day in Antrim in September - that's 28% of daylight hours.

Does it rain in Antrim in September?

There are usually 19 days with some rain in Antrim in September and the average monthly rainfall is 91mm.

Antrim September sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 05:32 19:16
Monday, 15th September 2025 05:58 18:41
Tuesday, 30th September 2025 06:26 18:03

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