Northern Ireland weather in December 2025

Q: 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.

Q: 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.

Q: Is the sea cold around Northern Ireland in December?

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

Q: 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.

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
8°C max day temperature
1
1 hour of sunshine per day
20
20 days with some rainfall
2
2°C min night temperature
7
7 hours of daylight per day
0
No heat & humidity
94
94 mm of monthly rainfall
0
No UV (Maximum) Index UV index
10
10°C sea temperature

More about Northern Ireland

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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.

8
Belfast
7
Londonderry

All Northern Ireland destinations

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

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.

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