Rosslare weather in September 2025

Expect 63°F daytime maximum temperatures in the shade with on average 5 hours of sunshine per day in Rosslare in September. Check more long-term weather averages for Rosslare in September before you book your next holiday to Ireland in 2025/2026.

  • 63°F maximum daytime temperature in September in Rosslare63
    63°F max day temperature
  • 5 hours of sunshine per day
  • 17 days with some rainfall in September in Rosslare17
    17 days with some rainfall
  • 52°F minimum night-time temperature in September in Rosslare52
    52°F 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
  • 3.1 inches monthly rainfall in September in Rosslare3.1
    3.1 inches of monthly rainfall
  • UV (maximum) index 4 (Moderate) in September in Rosslare4
    4 (Moderate) UV index
  • 59°F sea temperature in September in Rosslare59
    59°F 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)  |  Imperial (°F)

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More about Ireland

How warm is it in Rosslare in September?

Daytime temperatures usually reach 63°F in Rosslare in September, falling to 52°F 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 59°F.

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 3.1 inches.

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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