Belfast weather in May 2025

Expect 14°C 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.

  • 14°C maximum daytime temperature in May in Belfast14
    14°C max day temperature
  • 6 hours of sunshine per day
  • 16 days with some rainfall in May in Belfast16
    16 days with some rainfall
  • 6°C minimum night-time temperature in May in Belfast6
    6°C 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
  • 65 mm monthly rainfall in May in Belfast65
    65 mm of monthly rainfall
  • UV (maximum) index 5 (Moderate) in May in Belfast5
    5 (Moderate) UV index
  • 9°C sea temperature in May in Belfast9
    9°C 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 / mm)  |  Imperial (°F / inches)

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More about the UK

How warm is it in Belfast in May?

Daytime temperatures usually reach 14°C in Belfast in May, falling to 6°C 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.

Is the sea cold around Belfast in May?

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

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 65mm.

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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