Cardiff weather in December 2025

Expect daytime maximum temperatures of 46°F in Cardiff, Wales in December based on long-term weather averages. There are 2 hours of sunshine per day on average with 19 days with some rainfall and typically 4.3 inches of rainfall in the month.

  • 46°F maximum daytime temperature in December in Cardiff46
    46°F max day temperature
  • 2 hours of sunshine per day
  • 19 days with some rainfall in December in Cardiff19
    19 days with some rainfall
  • 37°F minimum night-time temperature in December in Cardiff37
    37°F min night temperature
  • 8 hours of daylight per day in December in Cardiff8
    8 hours of daylight per day
  • No heat & humidity in December in Cardiff0
    No heat & humidity
  • 4.3 inches monthly rainfall in December in Cardiff4.3
    4.3 inches of monthly rainfall
  • No UV (maximum) index in December in Cardiff0
    No UV (Maximum) Index UV index
  • 48°F sea temperature in December in Cardiff48
    48°F sea temperature

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The December 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 December?

Daytime temperatures usually reach 46°F in Cardiff in December, falling to 37°F at night.

How sunny is it in Cardiff in December?

There are normally 2 hours of bright sunshine each day in Cardiff in December - that's 19% of daylight hours.

How warm is the sea around Cardiff in December?

The average sea temperature around Cardiff in December is 48°F.

Does it rain in Cardiff in December?

There are usually 19 days with some rain in Cardiff in December and the average monthly rainfall is 4.3 inches.

Cardiff December sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st December 2025 07:56 16:07
Tuesday, 16th December 2025 08:13 16:04
Wednesday, 31st December 2025 08:18 16:14

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