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Dundalk weather in September 2025
Expect 17°C daytime maximum temperatures in the shade with on average 4 hours of sunshine per day in Dundalk in September. Check more long-term weather averages for Dundalk in September before you book your next holiday to Ireland in 2025/2026.
- 1717°C max day temperature
- 4 hours of sunshine per day
- 1616 days with some rainfall
- 99°C min night temperature
- 1313 hours of daylight per day
- 0No heat & humidity
- 7979 mm of monthly rainfall
- 44 (Moderate) UV index
- 1414°C sea temperature
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Dundalk by month
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Recommended for Ireland
The September weather guide for Ireland (Dundalk) 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 Dundalk in September?
Daytime temperatures usually reach 17°C in Dundalk in September, falling to 9°C at night.
How sunny is it in Dundalk in September?
There are normally 4 hours of bright sunshine each day in Dundalk in September - that's 30% of daylight hours.
How warm is the sea around Dundalk in September?
The average sea temperature around Dundalk in September is 14°C.
Does it rain in Dundalk in September?
There are usually 16 days with some rain in Dundalk in September and the average monthly rainfall is 79mm.
Dundalk September sunrise & sunset times
Browse the sunrise and sunset times for Dundalk in September 2025. Select a month to view Dundalk sunrise and sunset times for the next 12 months.
JanFebMarAprMayJunJulAugSepOctNovDec
Date | Sunrise times | Sunset times |
---|---|---|
Monday, 1st September 2025 | 05:34 | 19:16 |
Monday, 15th September 2025 | 05:59 | 18:41 |
Tuesday, 30th September 2025 | 06:26 | 18:04 |
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