Portstewart weather in August 2025

Expect 63°F daytime maximum temperatures in the shade with on average 4 hours of sunshine per day in Portstewart in August. Check more long-term weather averages for Portstewart in August before you book your next holiday to Northern Ireland in 2025/2026.

63
63°F max day temperature
4
4 hours of sunshine per day
19
19 days with some rainfall
50
50°F min night temperature
15
15 hours of daylight per day
0
No heat & humidity
3.6
3.6 inches of monthly rainfall
5
5 (Moderate) UV index
57
57°F sea temperature

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The August weather guide for Northern Ireland (Portstewart) 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) | Imperial (°F)

More about the UK

How warm is it in Portstewart in August?

Daytime temperatures usually reach 63°F in Portstewart in August, falling to 50°F at night.

How sunny is it in Portstewart in August?

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

How warm is the sea around Portstewart in August?

The average sea temperature around Portstewart in August is 57°F.

Does it rain in Portstewart in August?

There are usually 19 days with some rain in Portstewart in August and the average monthly rainfall is 3.6 inches.

Portstewart August sunrise & sunset times

Browse the sunrise and sunset times for Portstewart in August 2025. Select a month to view Portstewart sunrise and sunset times for the next 12 months.

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