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Sligo weather in September 2025
Expect 16°C daytime maximum temperatures in the shade with on average 3 hours of sunshine per day in Sligo in September. Check more long-term weather averages for Sligo in September before you book your next holiday to Ireland in 2025/2026.
- 1616°C max day temperature
- 3 hours of sunshine per day
- 2121 days with some rainfall
- 88°C min night temperature
- 1313 hours of daylight per day
- 0No heat & humidity
- 123123 mm of monthly rainfall
- 33 (Moderate) UV index
- 1515°C sea temperature
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Recommended for Ireland
The September weather guide for Ireland (Sligo) 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)
More about Ireland
How warm is it in Sligo in September?
Daytime temperatures usually reach 16°C in Sligo in September, falling to 8°C at night.
How sunny is it in Sligo in September?
There are normally 3 hours of bright sunshine each day in Sligo in September - that's 26% of daylight hours.
How warm is the sea around Sligo in September?
The average sea temperature around Sligo in September is 15°C.
Does it rain in Sligo in September?
There are usually 21 days with some rain in Sligo in September and the average monthly rainfall is 123mm.
Sligo September sunrise & sunset times
Browse the sunrise and sunset times for Sligo in September 2025. Select a month to view Sligo sunrise and sunset times for the next 12 months.
JanFebMarAprMayJunJulAugSepOctNovDec
Date | Sunrise times | Sunset times |
---|---|---|
Monday, 1st September 2025 | 05:42 | 19:24 |
Monday, 15th September 2025 | 06:07 | 18:50 |
Tuesday, 30th September 2025 | 06:34 | 18:12 |
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