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

More about Belfast

Belfast by month

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Recommended for Belfast

  • Search for dog friendly cottages in the UK
  • Book stays in Sussex, Shropshire, Somerset & more
  • Filter search by selecting holiday preferences

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)

Back to top

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

Related posts

Popular travel offers

Explore holidays in the sun for less

More holidays

Airport parking

More parking

Airport lounges

More lounges

Top ^