Rosslare weather in September 2026

Q: How warm is it in Rosslare in September?

Daytime temperatures usually reach 17°C in Rosslare in September, falling to 10°C at night.

Q: How sunny is it in Rosslare in September?

There are normally 4 hours of bright sunshine each day in Rosslare in September - that's 33% of daylight hours.

Q: How warm is the sea around Rosslare in September?

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

Q: Does it rain in Rosslare in September?

There are usually 15 days with some rain in Rosslare in September and the average monthly rainfall is 64mm.

Expect daytime maximum temperatures of 17°C in Rosslare, Ireland 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
17°C max day temperature
5
5 hours of sunshine per day
17
17 days with some rainfall
11
11°C min night temperature
13
13 hours of daylight per day
0
No heat & humidity
80
80 mm of monthly rainfall
4
4 (Moderate) UV index
15
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)