Portlaoise weather in September 2025

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

  • 17°C maximum daytime temperature in September in Portlaoise17
    17°C max day temperature
  • 4 hours of sunshine per day
  • 17 days with some rainfall in September in Portlaoise17
    17 days with some rainfall
  • 8°C minimum night-time temperature in September in Portlaoise8
    8°C min night temperature
  • 13 hours of daylight per day in September in Portlaoise13
    13 hours of daylight per day
  • No heat & humidity in September in Portlaoise0
    No heat & humidity
  • 84 mm monthly rainfall in September in Portlaoise84
    84 mm of monthly rainfall
  • UV (maximum) index 4 (Moderate) in September in Portlaoise4
    4 (Moderate) UV index

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

Daytime temperatures usually reach 17°C in Portlaoise in September, falling to 8°C at night.

How sunny is it in Portlaoise in September?

There are normally 4 hours of bright sunshine each day in Portlaoise in September - that's 29% of daylight hours.

Does it rain in Portlaoise in September?

There are usually 17 days with some rain in Portlaoise in September and the average monthly rainfall is 84mm.

Portlaoise September sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 05:39 19:18
Monday, 15th September 2025 06:03 18:44
Tuesday, 30th September 2025 06:29 18:08

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