Portstewart weather in May 2025

Expect 13°C daytime maximum temperatures in the shade with on average 6 hours of sunshine per day in Portstewart in May. Check more long-term weather averages for Portstewart in May before you book your next holiday to Northern Ireland in 2025/2026.

  • 13°C maximum daytime temperature in May in Portstewart13
    13°C max day temperature
  • 6 hours of sunshine per day
  • 17 days with some rainfall in May in Portstewart17
    17 days with some rainfall
  • 6°C minimum night-time temperature in May in Portstewart6
    6°C min night temperature
  • 16 hours of daylight per day in May in Portstewart16
    16 hours of daylight per day
  • No heat & humidity in May in Portstewart0
    No heat & humidity
  • 66 mm monthly rainfall in May in Portstewart66
    66 mm of monthly rainfall
  • UV (maximum) index 5 (Moderate) in May in Portstewart5
    5 (Moderate) UV index
  • 9°C sea temperature in May in Portstewart9
    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)

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More about the UK

How warm is it in Portstewart in May?

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

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.

Is the sea cold around Portstewart in May?

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

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.

Portstewart May sunrise & sunset times

Browse the sunrise and sunset times for Portstewart in May 2025. Select a month to view Portstewart sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Thursday, 1st May 2025 04:46 20:03
Friday, 16th May 2025 04:16 20:31
Saturday, 31st May 2025 03:55 20:55

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