Cardiff weather in May 2025

Expect 61°F daytime maximum temperatures in the shade with on average 6 hours of sunshine per day in Cardiff in May. Check more long-term weather averages for Cardiff in May before you book your next holiday to Wales in 2025/2026.

  • 61°F maximum daytime temperature in May in Cardiff61
    61°F max day temperature
  • 6 hours of sunshine per day
  • 15 days with some rainfall in May in Cardiff15
    15 days with some rainfall
  • 45°F minimum night-time temperature in May in Cardiff45
    45°F min night temperature
  • 16 hours of daylight per day in May in Cardiff16
    16 hours of daylight per day
  • No heat & humidity in May in Cardiff0
    No heat & humidity
  • 2.6 inches monthly rainfall in May in Cardiff2.6
    2.6 inches of monthly rainfall
  • UV (maximum) index 5 (Moderate) in May in Cardiff5
    5 (Moderate) UV index
  • 54°F sea temperature in May in Cardiff54
    54°F 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.

Metric (°C)  |  Imperial (°F)

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More about Wales

How warm is it in Cardiff in May?

Daytime temperatures usually reach 61°F in Cardiff in May, falling to 45°F at night.

How sunny is it in Cardiff in May?

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

How warm is the sea around Cardiff in May?

The average sea temperature around Cardiff in May is 54°F.

Does it rain in Cardiff in May?

There are usually 15 days with some rain in Cardiff in May and the average monthly rainfall is 2.6 inches.

Cardiff May sunrise & sunset times

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

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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