Dundalk weather in September 2025

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

  • 17°C maximum daytime temperature in September in Dundalk17
    17°C max day temperature
  • 4 hours of sunshine per day
  • 16 days with some rainfall in September in Dundalk16
    16 days with some rainfall
  • 9°C minimum night-time temperature in September in Dundalk9
    9°C min night temperature
  • 13 hours of daylight per day in September in Dundalk13
    13 hours of daylight per day
  • No heat & humidity in September in Dundalk0
    No heat & humidity
  • 79 mm monthly rainfall in September in Dundalk79
    79 mm of monthly rainfall
  • UV (maximum) index 4 (Moderate) in September in Dundalk4
    4 (Moderate) UV index
  • 14°C sea temperature in September in Dundalk14
    14°C sea temperature

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

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

How sunny is it in Dundalk in September?

There are normally 4 hours of bright sunshine each day in Dundalk in September - that's 30% of daylight hours.

How warm is the sea around Dundalk in September?

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

Does it rain in Dundalk in September?

There are usually 16 days with some rain in Dundalk in September and the average monthly rainfall is 79mm.

Dundalk September sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 05:34 19:16
Monday, 15th September 2025 05:59 18:41
Tuesday, 30th September 2025 06:26 18:04

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