Portstewart weather in June 2025

Q: How warm is it in Portstewart in June?

Daytime temperatures usually reach 16°C in Portstewart in June, falling to 8°C at night.

Q: How sunny is it in Portstewart in June?

There are normally 5 hours of bright sunshine each day in Portstewart in June - that's 31% of daylight hours.

Q: Is the sea cold around Portstewart in June?

The average sea temperature around Portstewart in June is 11°C.

Q: Does it rain in Portstewart in June?

There are usually 16 days with some rain in Portstewart in June and the average monthly rainfall is 70mm.

Expect 16°C daytime maximum temperatures in the shade with on average 5 hours of sunshine per day in Portstewart in June. Check more long-term weather averages for Portstewart in June before you book your next holiday to Northern Ireland in 2025/2026.

16
16°C max day temperature
5
5 hours of sunshine per day
16
16 days with some rainfall
8
8°C min night temperature
17
17 hours of daylight per day
0
No heat & humidity
70
70 mm of monthly rainfall
5
5 (Moderate) UV index
11
11°C sea temperature

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The June 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)