Portrush weather in August 2025

Q: How warm is it in Portrush in August?

Daytime temperatures usually reach 17°C in Portrush in August, falling to 10°C at night.

Q: How sunny is it in Portrush in August?

There are normally 4 hours of bright sunshine each day in Portrush in August - that's 28% of daylight hours.

Q: How warm is the sea around Portrush in August?

The average sea temperature around Portrush in August is 14°C.

Q: Does it rain in Portrush in August?

There are usually 19 days with some rain in Portrush in August and the average monthly rainfall is 92mm.

Expect 17°C daytime maximum temperatures in the shade with on average 4 hours of sunshine per day in Portrush in August. Check more long-term weather averages for Portrush in August before you book your next holiday to Northern Ireland in 2025/2026.

17
17°C max day temperature
4
4 hours of sunshine per day
19
19 days with some rainfall
10
10°C min night temperature
15
15 hours of daylight per day
0
No heat & humidity
92
92 mm of monthly rainfall
5
5 (Moderate) UV index
14
14°C sea temperature

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The August weather guide for Northern Ireland (Portrush) 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)