Northern Ireland weather in January 2026

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 daytime maximum temperatures of 7°C in Northern Ireland, UK in January based on long-term weather averages. There are 2 hours of sunshine per day on average with 20 days with some rainfall and typically 101 mm of rainfall in the month.

7
7°C max day temperature
2
2 hours of sunshine per day
20
20 days with some rainfall
1
1°C min night temperature
8
8 hours of daylight per day
0
No heat & humidity
101
101 mm of monthly rainfall
0
No UV (Maximum) Index UV index
9
9°C sea temperature

More about Northern Ireland

Northern Ireland by month

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

Recommended for Northern Ireland

Rural Retreats: Special offers on cottage holidays

Sale

Save on holiday cottages in the UK & Ireland
Browse latest special offers on hand-picked cottages
Filter offers by facilities, activities & location

Go to Rural Retreats deal >>

View all Rural Retreats offers

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.

7
Belfast
6
Londonderry

All Northern Ireland destinations

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

More about the UK

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.

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.

Is the sea cold around Northern Ireland in January?

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

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.

Northern Ireland January sunrise & sunset times

Browse the sunrise and sunset times for Northern Ireland in January 2026. 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