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

More about Dublin

Dublin by month

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Recommended for Dublin

  • Search for dog friendly cottages in the UK
  • Book stays in Sussex, Shropshire, Somerset & more
  • Filter search by selecting holiday preferences

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)

Back to top

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

Related posts

Popular travel offers

Explore holidays in the sun for less

More holidays

Airport parking

More parking

Airport lounges

More lounges

Top ^