Belfast weather in January
January in Belfast: cold, a little rain, with clean air — a good time to visit.
#11 of 12 months in Belfast · #628 of 897 destinations to visit in January · comfort 60/100 (tier C)
Updated June 2026 · climate normals from ERA5 reanalysis
Traveller notes on Belfast in January
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Belfast climate normals — January
| Daytime high | 8°C / 46°F | 🧥 cold |
|---|---|---|
| Nighttime low | 4°C / 40°F | |
| Rainfall | 54 mm / 2.1 in | 🌦 some rain |
| Rainy days | 10 days | |
| Humidity | 84% | 💦 very humid |
| Dew point | 4°C / 39°F | |
| Sunshine | 3.9 h/day | |
| Daylight | 8 h | |
| Wind | 23 km/h / 14 mph | |
| Snowfall | 0.9 cm / 0.4 in | |
| Air quality (US AQI) | 32 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Belfast in January — FAQ
- Is January a good time to visit Belfast?
- January in Belfast: cold, a little rain, with clean air — a good time to visit. It ranks #11 of 12 months for Belfast on SeasonMap's comfort score (60/100).
- What is the weather like in Belfast in January?
- In January, Belfast averages a daily high of 7.7°C and a low of 4.4°C, with about 53.7 mm of rain over roughly 10 rainy days.
- What is the air quality in Belfast in January?
- Belfast has a mean US Air Quality Index of about 32 in January.