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Northern Ireland weather in August 2025
Expect 18°C daytime maximum temperatures in the shade with on average 5 hours of sunshine per day in Northern Ireland in August. Check more long-term weather averages for Northern Ireland in August before you book your next holiday to Northern Ireland in 2025/2026.
- 1818°C max day temperature
- 5 hours of sunshine per day
- 1717 days with some rainfall
- 1111°C min night temperature
- 1515 hours of daylight per day
- 0No heat & humidity
- 8989 mm of monthly rainfall
- 55 (Moderate) UV index
- 1313°C sea temperature
More about Northern Ireland
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Northern Ireland by month
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Recommended for Northern Ireland
The August weather guide for Northern Ireland (Belfast) 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.
Top Northern Ireland destinations
Below are average maximum temperatures at popular countries, regions and places in Northern Ireland in August. Select a holiday destination to see more weather parameters.
All Northern Ireland destinations
- Antrim
- Armagh
- Ballycastle
- Ballymena
- Ballymoney
- Bangor
- Belfast
- Carrickfergus
- Coleraine
- Downpatrick
- Dungannon
- Enniskillen
- Hillsborough
- Kilkeel
- Larne
- Londonderry
- Magherafelt
- Newcastle
- Newry
- Omagh
- Portrush
- Portstewart
- Strabane
Metric (°C / mm) | Imperial (°F / inches)
More about the UK
How hot is it in Northern Ireland in August?
Daytime temperatures usually reach 18°C in Belfast, Northern Ireland in August, falling to 11°C at night.
How sunny is it in Northern Ireland in August?
There are normally 5 hours of bright sunshine each day in Belfast, Northern Ireland in August - that's 32% of daylight hours.
How warm is the sea around Northern Ireland in August?
The average sea temperature around Belfast, Northern Ireland in August is 13°C.
Does it rain in Northern Ireland in August?
There are usually 17 days with some rain in Belfast, Northern Ireland in August and the average monthly rainfall is 89mm.
Northern Ireland August sunrise & sunset times
Browse the sunrise and sunset times for Northern Ireland in August 2025. Select a month to view Northern Ireland sunrise and sunset times for the next 12 months. The Northern Ireland sunrise and sunset times shown below are for Belfast.
JanFebMarAprMayJunJulAugSepOctNovDec
Date | Sunrise times | Sunset times |
---|---|---|
Friday, 1st August 2025 | 04:35 | 20:24 |
Saturday, 16th August 2025 | 05:02 | 19:53 |
Sunday, 31st August 2025 | 05:29 | 19:17 |
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