Londonderry weather in September 2025

Expect 15°C daytime maximum temperatures in the shade with on average 3 hours of sunshine per day in Londonderry in September. Check more long-term weather averages for Londonderry in September before you book your next holiday to Northern Ireland in 2025/2026.

  • 15°C maximum daytime temperature in September in Londonderry15
    15°C max day temperature
  • 3 hours of sunshine per day
  • 21 days with some rainfall in September in Londonderry21
    21 days with some rainfall
  • 8°C minimum night-time temperature in September in Londonderry8
    8°C min night temperature
  • 13 hours of daylight per day in September in Londonderry13
    13 hours of daylight per day
  • No heat & humidity in September in Londonderry0
    No heat & humidity
  • 109 mm monthly rainfall in September in Londonderry109
    109 mm of monthly rainfall
  • UV (maximum) index 3 (Moderate) in September in Londonderry3
    3 (Moderate) UV index

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Londonderry by month

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Recommended for Northern Ireland

  • Save 25% on breaks with National Trust Holidays
  • Discover stays acoss Devon, North Wales & more
  • Travel before 30th November 2024 (inclusive)

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

Daytime temperatures usually reach 15°C in Londonderry in September, falling to 8°C at night.

How sunny is it in Londonderry in September?

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

Does it rain in Londonderry in September?

There are usually 21 days with some rain in Londonderry in September and the average monthly rainfall is 109mm.

Londonderry September sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 05:36 19:21
Monday, 15th September 2025 06:02 18:46
Tuesday, 30th September 2025 06:30 18:07

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