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 daytime maximum temperatures of 17°C in Portstewart, Northern Ireland in July based on long-term weather averages. There are 4 hours of sunshine per day on average with 18 days with some rainfall and typically 77 mm of rainfall in the month.

17
17°C max day temperature
4
4 hours of sunshine per day
18
18 days with some rainfall
10
10°C min night temperature
17
17 hours of daylight per day
0
No heat & humidity
77
77 mm of monthly rainfall
6
6 (High) UV index
13
13°C 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 / mm) | Imperial (°F / inches)