Cardiff weather in January
January in Cardiff: cold, rainy, with clean air — a fair time to visit.
#11 of 12 months in Cardiff · #655 of 897 destinations to visit in January · comfort 57/100 (tier D)
Updated June 2026 · climate normals from ERA5 reanalysis
Traveller notes on Cardiff in January
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Cardiff climate normals — January
| Daytime high | 8°C / 46°F | 🧥 cold |
|---|---|---|
| Nighttime low | 3°C / 38°F | |
| Rainfall | 83 mm / 3.3 in | 🌧 rainy |
| Rainy days | 12 days | |
| Humidity | 86% | 💦 very humid |
| Dew point | 3°C / 38°F | |
| Sunshine | 3.9 h/day | |
| Daylight | 8.4 h | |
| Wind | 24 km/h / 15 mph | |
| Snowfall | 1.3 cm / 0.5 in | |
| Air quality (US AQI) | 31 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Cardiff in January — FAQ
- Is January a good time to visit Cardiff?
- January in Cardiff: cold, rainy, with clean air — a fair time to visit. It ranks #11 of 12 months for Cardiff on SeasonMap's comfort score (57/100).
- What is the weather like in Cardiff in January?
- In January, Cardiff averages a daily high of 7.6°C and a low of 3.2°C, with about 82.7 mm of rain over roughly 12.4 rainy days.
- What is the air quality in Cardiff in January?
- Cardiff has a mean US Air Quality Index of about 31 in January.
- Does it snow in Cardiff in January?
- Cardiff sees roughly 1.3 cm of snowfall in January.