Northern Ireland weather in December 2025

Expect daytime maximum temperatures of 8°C in Northern Ireland, UK 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 94 mm of rainfall in the month.

  • 8°C maximum daytime temperature in December in Northern Ireland (Belfast)8
    8°C max day temperature
  • 1 hour of sunshine per day
  • 20 days with some rainfall in December in Northern Ireland (Belfast)20
    20 days with some rainfall
  • 2°C minimum night-time temperature in December in Northern Ireland (Belfast)2
    2°C min night temperature
  • 7 hours of daylight per day in December in Northern Ireland (Belfast)7
    7 hours of daylight per day
  • No heat & humidity in December in Northern Ireland (Belfast)0
    No heat & humidity
  • 94 mm monthly rainfall in December in Northern Ireland (Belfast)94
    94 mm of monthly rainfall
  • No UV (maximum) index in December in Northern Ireland (Belfast)0
    No UV (Maximum) Index UV index
  • 10°C sea temperature in December in Northern Ireland (Belfast)10
    10°C sea temperature

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The December weather guide for Northern Ireland (Belfast) 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 Northern Ireland destinations

Below are average maximum temperatures at popular countries, regions and places in Northern Ireland in December. Select a holiday destination to see more weather parameters.

All Northern Ireland destinations

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

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More about the UK

How warm is it in Northern Ireland in December?

Daytime temperatures usually reach 8°C in Belfast, Northern Ireland in December, falling to 2°C at night.

How sunny is it in Northern Ireland in December?

There are normally 1 hour of bright sunshine each day in Belfast, Northern Ireland in December - that's 18% of daylight hours.

Is the sea cold around Northern Ireland in December?

The average sea temperature around Belfast, Northern Ireland in December is 10°C.

Does it rain in Northern Ireland in December?

There are usually 20 days with some rain in Belfast, Northern Ireland in December and the average monthly rainfall is 94mm.

Northern Ireland December sunrise & sunset times

Browse the sunrise and sunset times for Northern Ireland in December 2025. Select a month to view Northern Ireland sunrise and sunset times for the next 12 months. The Northern Ireland sunrise and sunset times shown below are for Belfast.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st December 2025 08:23 16:03
Tuesday, 16th December 2025 08:41 15:58
Wednesday, 31st December 2025 08:46 16:08

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