Galway weather in September 2025

Expect 17°C daytime maximum temperatures in the shade with on average 3 hours of sunshine per day in Galway in September. Check more long-term weather averages for Galway in September before you book your next holiday to Ireland in 2025/2026.

  • 17°C maximum daytime temperature in September in Galway17
    17°C max day temperature
  • 3 hours of sunshine per day
  • 20 days with some rainfall in September in Galway20
    20 days with some rainfall
  • 9°C minimum night-time temperature in September in Galway9
    9°C min night temperature
  • 13 hours of daylight per day in September in Galway13
    13 hours of daylight per day
  • No heat & humidity in September in Galway0
    No heat & humidity
  • 104 mm monthly rainfall in September in Galway104
    104 mm of monthly rainfall
  • UV (maximum) index 4 (Moderate) in September in Galway4
    4 (Moderate) UV index
  • 15°C sea temperature in September in Galway15
    15°C sea temperature

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The September weather guide for Ireland (Galway) 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 Galway in September?

Daytime temperatures usually reach 17°C in Galway in September, falling to 9°C at night.

How sunny is it in Galway in September?

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

How warm is the sea around Galway in September?

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

Does it rain in Galway in September?

There are usually 20 days with some rain in Galway in September and the average monthly rainfall is 104mm.

Galway September sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 05:46 19:25
Monday, 15th September 2025 06:10 18:51
Tuesday, 30th September 2025 06:36 18:15

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