Dublin weather in September 2025

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

  • 17°C maximum daytime temperature in September in Dublin17
    17°C max day temperature
  • 4 hours of sunshine per day
  • 15 days with some rainfall in September in Dublin15
    15 days with some rainfall
  • 10°C minimum night-time temperature in September in Dublin10
    10°C min night temperature
  • 13 hours of daylight per day in September in Dublin13
    13 hours of daylight per day
  • No heat & humidity in September in Dublin0
    No heat & humidity
  • 64 mm monthly rainfall in September in Dublin64
    64 mm of monthly rainfall
  • UV (maximum) index 4 (Moderate) in September in Dublin4
    4 (Moderate) UV index
  • 14°C sea temperature in September in Dublin14
    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.

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

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More about Ireland

How warm is it in Dublin in September?

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

How sunny is it in Dublin in September?

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

How warm is the sea around Dublin in September?

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

Does it rain in Dublin in September?

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

Dublin September sunrise & sunset times

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

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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