Caernarfon weather in December 2025

Expect daytime maximum temperatures of 8°C in Caernarfon in December based on long-term weather averages. There is 1 hour of sunshine per day on average with 20 days with some rainfall and typically 183 mm of rainfall in the month.

  • 8°C maximum daytime temperature in December in Caernarfon8
    8°C max day temperature
  • 1 hour of sunshine per day
  • 20 days with some rainfall in December in Caernarfon20
    20 days with some rainfall
  • 3°C minimum night-time temperature in December in Caernarfon3
    3°C min night temperature
  • 8 hours of daylight per day in December in Caernarfon8
    8 hours of daylight per day
  • No heat & humidity in December in Caernarfon0
    No heat & humidity
  • 183 mm monthly rainfall in December in Caernarfon183
    183 mm of monthly rainfall
  • No UV (maximum) index in December in Caernarfon0
    No UV (Maximum) Index UV index
  • 10°C sea temperature in December in Caernarfon10
    10°C sea temperature

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The December weather guide for Wales (Caernarfon) 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)

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More about Wales

How warm is it in Caernarfon in December?

Daytime temperatures usually reach 8°C in Caernarfon in December, falling to 3°C at night.

How sunny is it in Caernarfon in December?

There are normally 1 hour of bright sunshine each day in Caernarfon in December - that's 16% of daylight hours.

Is the sea cold around Caernarfon in December?

The average sea temperature around Caernarfon in December is 10°C.

Does it rain in Caernarfon in December?

There are usually 20 days with some rain in Caernarfon in December and the average monthly rainfall is 183mm.

Caernarfon December sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st December 2025 08:08 16:04
Tuesday, 16th December 2025 08:26 16:00
Wednesday, 31st December 2025 08:31 16:09

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