Belfast weather in January 2026

Q: How cold is it in Belfast in January?

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

Q: How sunny is it in Belfast in January?

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

Q: Is the sea cold around Belfast in January?

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

Q: Does it rain in Belfast in January?

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

Expect 7°C daytime maximum temperatures in the shade with on average 2 hours of sunshine per day in Belfast in January based on long-term weather averages. There is usually 20 days with some rainfall and 101 mm of average monthly rainfall in January.

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

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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.

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