Belfast weather in October 2025

Q: How warm is it in Belfast in October?

Daytime temperatures usually reach 13°C in Belfast in October, falling to 7°C at night.

Q: How sunny is it in Belfast in October?

There are normally 3 hours of bright sunshine each day in Belfast in October - that's 28% of daylight hours.

Q: How warm is the sea around Belfast in October?

The average sea temperature around Belfast in October is 13°C.

Q: Does it rain in Belfast in October?

There are usually 19 days with some rain in Belfast in October and the average monthly rainfall is 100mm.

Expect 13°C daytime maximum temperatures in the shade with on average 3 hours of sunshine per day in Belfast in October. Check more long-term weather averages for Belfast in October before you book your next holiday to Northern Ireland in 2025/2026.

13
13°C max day temperature
3
3 hours of sunshine per day
19
19 days with some rainfall
7
7°C min night temperature
10
10 hours of daylight per day
0
No heat & humidity
100
100 mm of monthly rainfall
2
2 (Low) UV index
13
13°C sea temperature

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The October 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)