Rosslare weather in September 2025

Expect daytime maximum temperatures of 17°C in Rosslare in September based on long-term weather averages. There are 5 hours of sunshine per day on average with 17 days with some rainfall and typically 80 mm of rainfall in the month.

  • 17°C maximum daytime temperature in September in Rosslare17
    17°C max day temperature
  • 5 hours of sunshine per day
  • 17 days with some rainfall in September in Rosslare17
    17 days with some rainfall
  • 11°C minimum night-time temperature in September in Rosslare11
    11°C min night temperature
  • 13 hours of daylight per day in September in Rosslare13
    13 hours of daylight per day
  • No heat & humidity in September in Rosslare0
    No heat & humidity
  • 80 mm monthly rainfall in September in Rosslare80
    80 mm of monthly rainfall
  • UV (maximum) index 4 (Moderate) in September in Rosslare4
    4 (Moderate) UV index
  • 15°C sea temperature in September in Rosslare15
    15°C sea temperature

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

Daytime temperatures usually reach 17°C in Rosslare in September, falling to 11°C at night.

How sunny is it in Rosslare in September?

There are normally 5 hours of bright sunshine each day in Rosslare in September - that's 36% of daylight hours.

How warm is the sea around Rosslare in September?

The average sea temperature around Rosslare in September is 15°C.

Does it rain in Rosslare in September?

There are usually 17 days with some rain in Rosslare in September and the average monthly rainfall is 80mm.

Rosslare September sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 05:37 19:13
Monday, 15th September 2025 06:00 18:40
Tuesday, 30th September 2025 06:25 18:05

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