Cardiff weather in December 2025

Expect daytime maximum temperatures of 8°C in Cardiff 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 109 mm of rainfall in the month.

  • 8°C maximum daytime temperature in December in Cardiff8
    8°C max day temperature
  • 2 hours of sunshine per day
  • 19 days with some rainfall in December in Cardiff19
    19 days with some rainfall
  • 3°C minimum night-time temperature in December in Cardiff3
    3°C 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
  • 109 mm monthly rainfall in December in Cardiff109
    109 mm of monthly rainfall
  • No UV (maximum) index in December in Cardiff0
    No UV (Maximum) Index UV index
  • 9°C sea temperature in December in Cardiff9
    9°C sea temperature

More about Cardiff

Cardiff by month

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

Recommended for Wales

Away Resorts: Weekend break deals

  • Book weekend breaks with Away Resorts
  • Discover stays in Dorset, Essex & beyond
  • Travel before 31st December 2025 (inclusive)
Go to Away Resorts deal >>

Expires at 23:59 on Sunday 31st Aug 2025 · View all Away Resorts offers

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 / mm)  |  Imperial (°F / inches)

Back to top

More about Wales

How warm is it in Cardiff in December?

Daytime temperatures usually reach 8°C in Cardiff in December, falling to 3°C 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.

Is the sea cold around Cardiff in December?

The average sea temperature around Cardiff in December is 9°C.

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 109mm.

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

Related posts

Popular travel offers

Explore holidays in the sun for less

More holidays

Airport parking

More parking

Airport lounges

More lounges

Top ^