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Donegal weather in September 2025
Expect 15°C daytime maximum temperatures in the shade with on average 3 hours of sunshine per day in Donegal in September. Check more long-term weather averages for Donegal in September before you book your next holiday to Ireland in 2025/2026.
- 1515°C max day temperature
- 3 hours of sunshine per day
- 2222 days with some rainfall
- 88°C min night temperature
- 1313 hours of daylight per day
- 0No heat & humidity
- 145145 mm of monthly rainfall
- 33 (Moderate) UV index
- 1515°C sea temperature
More about Donegal
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Donegal by month
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Recommended for Ireland
The September weather guide for Ireland (Donegal) 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 Donegal in September?
Daytime temperatures usually reach 15°C in Donegal in September, falling to 8°C at night.
How sunny is it in Donegal in September?
There are normally 3 hours of bright sunshine each day in Donegal in September - that's 27% of daylight hours.
How warm is the sea around Donegal in September?
The average sea temperature around Donegal in September is 15°C.
Does it rain in Donegal in September?
There are usually 22 days with some rain in Donegal in September and the average monthly rainfall is 145mm.
Donegal September sunrise & sunset times
Browse the sunrise and sunset times for Donegal in September 2025. Select a month to view Donegal sunrise and sunset times for the next 12 months.
JanFebMarAprMayJunJulAugSepOctNovDec
Date | Sunrise times | Sunset times |
---|---|---|
Monday, 1st September 2025 | 05:40 | 19:24 |
Monday, 15th September 2025 | 06:05 | 18:49 |
Tuesday, 30th September 2025 | 06:33 | 18:10 |
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