Castletownbere weather in September 2025

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

  • 16°C maximum daytime temperature in September in Castletownbere16
    16°C max day temperature
  • 4 hours of sunshine per day
  • 19 days with some rainfall in September in Castletownbere19
    19 days with some rainfall
  • 10°C minimum night-time temperature in September in Castletownbere10
    10°C min night temperature
  • 13 hours of daylight per day in September in Castletownbere13
    13 hours of daylight per day
  • No heat & humidity in September in Castletownbere0
    No heat & humidity
  • 132 mm monthly rainfall in September in Castletownbere132
    132 mm of monthly rainfall
  • UV (maximum) index 4 (Moderate) in September in Castletownbere4
    4 (Moderate) UV index
  • 15°C sea temperature in September in Castletownbere15
    15°C sea temperature

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The September weather guide for Ireland (Castletownbere) 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 Ireland

How warm is it in Castletownbere in September?

Daytime temperatures usually reach 16°C in Castletownbere in September, falling to 10°C at night.

How sunny is it in Castletownbere in September?

There are normally 4 hours of bright sunshine each day in Castletownbere in September - that's 29% of daylight hours.

How warm is the sea around Castletownbere in September?

The average sea temperature around Castletownbere in September is 15°C.

Does it rain in Castletownbere in September?

There are usually 19 days with some rain in Castletownbere in September and the average monthly rainfall is 132mm.

Castletownbere September sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 05:52 19:26
Monday, 15th September 2025 06:15 18:54
Tuesday, 30th September 2025 06:39 18:19

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