Belfast weather in May 2025

Expect 57°F daytime maximum temperatures in the shade with on average 6 hours of sunshine per day in Belfast in May. Check more long-term weather averages for Belfast in May before you book your next holiday to Northern Ireland in 2025/2026.

  • 57°F maximum daytime temperature in May in Belfast57
    57°F max day temperature
  • 6 hours of sunshine per day
  • 16 days with some rainfall in May in Belfast16
    16 days with some rainfall
  • 43°F minimum night-time temperature in May in Belfast43
    43°F min night temperature
  • 16 hours of daylight per day in May in Belfast16
    16 hours of daylight per day
  • No heat & humidity in May in Belfast0
    No heat & humidity
  • 2.6 inches monthly rainfall in May in Belfast2.6
    2.6 inches of monthly rainfall
  • UV (maximum) index 5 (Moderate) in May in Belfast5
    5 (Moderate) UV index
  • 48°F sea temperature in May in Belfast48
    48°F sea temperature

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The May weather guide for Northern Ireland (Belfast) 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)

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More about the UK

How warm is it in Belfast in May?

Daytime temperatures usually reach 57°F in Belfast in May, falling to 43°F at night.

How sunny is it in Belfast in May?

There are normally 6 hours of bright sunshine each day in Belfast in May - that's 37% of daylight hours.

How warm is the sea around Belfast in May?

The average sea temperature around Belfast in May is 48°F.

Does it rain in Belfast in May?

There are usually 16 days with some rain in Belfast in May and the average monthly rainfall is 2.6 inches.

Belfast May sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Thursday, 1st May 2025 04:45 19:58
Friday, 16th May 2025 04:16 20:25
Saturday, 31st May 2025 03:56 20:48

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