Portstewart weather in May 2025

Q: How warm is it in Portstewart in May?

Daytime temperatures usually reach 13°C in Portstewart in May, falling to 6°C at night.

Q: How sunny is it in Portstewart in May?

There are normally 6 hours of bright sunshine each day in Portstewart in May - that's 35% of daylight hours.

Q: Is the sea cold around Portstewart in May?

The average sea temperature around Portstewart in May is 9°C.

Q: Does it rain in Portstewart in May?

There are usually 17 days with some rain in Portstewart in May and the average monthly rainfall is 66mm.

Expect daytime maximum temperatures of 13°C in Portstewart, Northern Ireland in May based on long-term weather averages. There are 6 hours of sunshine per day on average with 17 days with some rainfall and typically 66 mm of rainfall in the month.

13
13°C max day temperature
6
6 hours of sunshine per day
17
17 days with some rainfall
6
6°C min night temperature
16
16 hours of daylight per day
0
No heat & humidity
66
66 mm of monthly rainfall
5
5 (Moderate) UV index
9
9°C sea temperature

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The May 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)