Wales weather in May 2025

Expect 16°C daytime maximum temperatures in the shade with on average 6 hours of sunshine per day in Wales in May. Check more long-term weather averages for Wales in May before you book your next holiday to Wales in 2025/2026.

  • 16°C maximum daytime temperature in May in Wales (Cardiff)16
    16°C max day temperature
  • 6 hours of sunshine per day
  • 15 days with some rainfall in May in Wales (Cardiff)15
    15 days with some rainfall
  • 7°C minimum night-time temperature in May in Wales (Cardiff)7
    7°C min night temperature
  • 16 hours of daylight per day in May in Wales (Cardiff)16
    16 hours of daylight per day
  • No heat & humidity in May in Wales (Cardiff)0
    No heat & humidity
  • 65 mm monthly rainfall in May in Wales (Cardiff)65
    65 mm of monthly rainfall
  • UV (maximum) index 5 (Moderate) in May in Wales (Cardiff)5
    5 (Moderate) UV index
  • 12°C sea temperature in May in Wales (Cardiff)12
    12°C sea temperature

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The May weather guide for Wales (Cardiff) 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 Wales destinations

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

All Wales regions

All Wales destinations

Metric (°C / mm)  |  Imperial (°F / inches)

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More about Wales

How warm is it in Wales in May?

Daytime temperatures usually reach 16°C in Cardiff, Wales in May, falling to 7°C at night.

How sunny is it in Wales in May?

There are normally 6 hours of bright sunshine each day in Cardiff, Wales in May - that's 41% of daylight hours.

How warm is the sea around Wales in May?

The average sea temperature around Cardiff, Wales in May is 12°C.

Does it rain in Wales in May?

There are usually 15 days with some rain in Cardiff, Wales in May and the average monthly rainfall is 65mm.

Wales May sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Thursday, 1st May 2025 04:44 19:36
Friday, 16th May 2025 04:19 20:00
Saturday, 31st May 2025 04:02 20:19

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