- Kids stay & eat for free at Marriot Bonvoy
- Destinations include Europe, Middle East & Africa
- Valid for up to 2 adults & 2 kids aged up to 12
Letterkenny weather in September 2025
Expect 15°C daytime maximum temperatures in the shade with on average 3 hours of sunshine per day in Letterkenny in September. Check more long-term weather averages for Letterkenny 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
- 120120 mm of monthly rainfall
- 33 (Moderate) UV index
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Recommended for Ireland
The September weather guide for Ireland (Letterkenny) 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 Letterkenny in September?
Daytime temperatures usually reach 15°C in Letterkenny in September, falling to 8°C at night.
How sunny is it in Letterkenny in September?
There are normally 3 hours of bright sunshine each day in Letterkenny in September - that's 27% of daylight hours.
Does it rain in Letterkenny in September?
There are usually 22 days with some rain in Letterkenny in September and the average monthly rainfall is 120mm.
Letterkenny September sunrise & sunset times
Browse the sunrise and sunset times for Letterkenny in September 2025. Select a month to view Letterkenny sunrise and sunset times for the next 12 months.
JanFebMarAprMayJunJulAugSepOctNovDec
Date | Sunrise times | Sunset times |
---|---|---|
Monday, 1st September 2025 | 05:38 | 19:23 |
Monday, 15th September 2025 | 06:04 | 18:47 |
Tuesday, 30th September 2025 | 06:32 | 18:09 |
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