Ireland weather in September 2025

Expect 17°C daytime maximum temperatures in the shade with on average 4 hours of sunshine per day in Ireland in September. Check more long-term weather averages for Ireland in September before you book your next holiday to Ireland in 2025/2026.

  • 17°C maximum daytime temperature in September in Ireland (Dublin)17
    17°C max day temperature
  • 4 hours of sunshine per day
  • 15 days with some rainfall in September in Ireland (Dublin)15
    15 days with some rainfall
  • 10°C minimum night-time temperature in September in Ireland (Dublin)10
    10°C min night temperature
  • 13 hours of daylight per day in September in Ireland (Dublin)13
    13 hours of daylight per day
  • No heat & humidity in September in Ireland (Dublin)0
    No heat & humidity
  • 64 mm monthly rainfall in September in Ireland (Dublin)64
    64 mm of monthly rainfall
  • UV (maximum) index 4 (Moderate) in September in Ireland (Dublin)4
    4 (Moderate) UV index
  • 14°C sea temperature in September in Ireland (Dublin)14
    14°C sea temperature

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The September weather guide for Ireland (Dublin) 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.

Top Ireland destinations

Below are average maximum temperatures at popular countries, regions and places in Ireland in September. Select a holiday destination to see more weather parameters.

All Ireland destinations

Metric (°C / mm)  |  Imperial (°F / inches)

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More about Ireland

How warm is it in Ireland in September?

Daytime temperatures usually reach 17°C in Dublin, Ireland in September, falling to 10°C at night.

How sunny is it in Ireland in September?

There are normally 4 hours of bright sunshine each day in Dublin, Ireland in September - that's 33% of daylight hours.

How warm is the sea around Ireland in September?

The average sea temperature around Dublin, Ireland in September is 14°C.

Does it rain in Ireland in September?

There are usually 15 days with some rain in Dublin, Ireland in September and the average monthly rainfall is 64mm.

Ireland September sunrise & sunset times

Browse the sunrise and sunset times for Ireland in September 2025. Select a month to view Ireland sunrise and sunset times for the next 12 months. The Ireland sunrise and sunset times shown below are for Dublin.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 05:35 19:14
Monday, 15th September 2025 05:59 18:40
Tuesday, 30th September 2025 06:25 18:04

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