Northern Ireland weather in January 2025

Q: How cold is it in Northern Ireland in January?

Daytime temperatures usually reach 7°C in Belfast, Northern Ireland in January, falling to 1°C at night.

Q: How sunny is it in Northern Ireland in January?

There are normally 2 hours of bright sunshine each day in Belfast, Northern Ireland in January - that's 20% of daylight hours.

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

The average sea temperature around Belfast, Northern Ireland in January is 9°C.

Q: Does it rain in Northern Ireland in January?

There are usually 20 days with some rain in Belfast, Northern Ireland in January and the average monthly rainfall is 101mm.

Expect 45°F daytime maximum temperatures in the shade with on average 2 hours of sunshine per day in Northern Ireland in January. Check more long-term weather averages for Northern Ireland in January before you book your next holiday to Northern Ireland in 2025/2026.

45
45°F max day temperature
2
2 hours of sunshine per day
20
20 days with some rainfall
34
34°F min night temperature
8
8 hours of daylight per day
0
No heat & humidity
4.0
4.0 inches of monthly rainfall
0
No UV (Maximum) Index UV index
48
48°F sea temperature

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The January 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 January. Select a holiday destination to see more weather parameters.

45
Belfast
43
Londonderry

All Northern Ireland destinations

Metric (°C) | Imperial (°F)

More about the UK

How cold is it in Northern Ireland in January?

Daytime temperatures usually reach 45°F in Belfast, Northern Ireland in January, falling to 34°F at night.

How sunny is it in Northern Ireland in January?

There are normally 2 hours of bright sunshine each day in Belfast, Northern Ireland in January - that's 20% of daylight hours.

How warm is the sea around Northern Ireland in January?

The average sea temperature around Belfast, Northern Ireland in January is 48°F.

Does it rain in Northern Ireland in January?

There are usually 20 days with some rain in Belfast, Northern Ireland in January and the average monthly rainfall is 4.0 inches.

Northern Ireland January sunrise & sunset times

Browse the sunrise and sunset times for Northern Ireland in January 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.

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