Portstewart weather in July 2025

Q: How warm is it in Portstewart in July?

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

Q: How sunny is it in Portstewart in July?

There are normally 4 hours of bright sunshine each day in Portstewart in July - that's 25% of daylight hours.

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

The average sea temperature around Portstewart in July is 13°C.

Q: Does it rain in Portstewart in July?

There are usually 18 days with some rain in Portstewart in July and the average monthly rainfall is 77mm.

Expect 63°F daytime maximum temperatures in the shade with on average 4 hours of sunshine per day in Portstewart in July. Check more long-term weather averages for Portstewart in July 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
18
18 days with some rainfall
50
50°F min night temperature
17
17 hours of daylight per day
0
No heat & humidity
3.0
3.0 inches of monthly rainfall
6
6 (High) UV index
55
55°F sea temperature

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The July 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)