Cardiff weather in December
December in Cardiff: cold, rainy, with clean air — a fair time to visit.
#12 of 12 months in Cardiff · #712 of 897 destinations to visit in December · comfort 54/100 (tier D)
Updated June 2026 · climate normals from ERA5 reanalysis
Traveller notes on Cardiff in December
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Cardiff climate normals — December
| Daytime high | 9°C / 47°F | 🧥 cold |
|---|---|---|
| Nighttime low | 5°C / 41°F | |
| Rainfall | 132 mm / 5.2 in | 🌧 rainy |
| Rainy days | 18 days | |
| Humidity | 89% | 💦 very humid |
| Dew point | 5°C / 40°F | |
| Sunshine | 3.2 h/day | |
| Daylight | 7.9 h | |
| Wind | 27 km/h / 17 mph | |
| Snowfall | 0.2 cm / 0.1 in | |
| Air quality (US AQI) | 34 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Cardiff in December — FAQ
- Is December a good time to visit Cardiff?
- December in Cardiff: cold, rainy, with clean air — a fair time to visit. It ranks #12 of 12 months for Cardiff on SeasonMap's comfort score (54/100).
- What is the weather like in Cardiff in December?
- In December, Cardiff averages a daily high of 8.6°C and a low of 4.8°C, with about 132.3 mm of rain over roughly 17.6 rainy days.
- What is the air quality in Cardiff in December?
- Cardiff has a mean US Air Quality Index of about 34 in December.