Portstewart weather in August 2025

Q: How warm is it in Portstewart in August?

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

Q: 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.

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

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

Q: 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 92mm.

Expect daytime maximum temperatures of 63°F in Portstewart, Northern Ireland in August based on long-term weather averages. There are 4 hours of sunshine per day on average with 19 days with some rainfall and typically 3.6 inches of rainfall in the month.

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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