Northern Ireland weather in May 2025

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

  • 57°F maximum daytime temperature in May in Northern Ireland (Belfast)57
    57°F max day temperature
  • 6 hours of sunshine per day
  • 16 days with some rainfall in May in Northern Ireland (Belfast)16
    16 days with some rainfall
  • 43°F minimum night-time temperature in May in Northern Ireland (Belfast)43
    43°F min night temperature
  • 16 hours of daylight per day in May in Northern Ireland (Belfast)16
    16 hours of daylight per day
  • No heat & humidity in May in Northern Ireland (Belfast)0
    No heat & humidity
  • 2.6 inches monthly rainfall in May in Northern Ireland (Belfast)2.6
    2.6 inches of monthly rainfall
  • UV (maximum) index 5 (Moderate) in May in Northern Ireland (Belfast)5
    5 (Moderate) UV index
  • 48°F sea temperature in May in Northern Ireland (Belfast)48
    48°F sea temperature

More about Northern Ireland

Northern Ireland by month

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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.

Top Northern Ireland destinations

Below are average maximum temperatures at popular countries, regions and places in Northern Ireland in May. Select a holiday destination to see more weather parameters.

All Northern Ireland destinations

Metric (°C)  |  Imperial (°F)

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More about the UK

How warm is it in Northern Ireland in May?

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

How sunny is it in Northern Ireland in May?

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

How warm is the sea around Northern Ireland in May?

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

Does it rain in Northern Ireland in May?

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

Northern Ireland May sunrise & sunset times

Browse the sunrise and sunset times for Northern Ireland in May 2025. Select a month to view Northern Ireland sunrise and sunset times for the next 12 months. The Northern Ireland sunrise and sunset times shown below are for Belfast.

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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