December · United Kingdom
Best time to visit Cardiff in December Weather, crowds & prices
Weather in Cardiff in December
Average temperature 7°C, 115 mm of rain, about 0 days with 6+ hours of sunshine and 94% humidity — based on the five most recent complete years of ERA5 data (2021–2025).
December score
3.6/10
Ranked #12 of 12 months
- Avg temp
- 7°C
- Rainfall
- 115 mm
- Humidity
- 94%
- Days with 6h+ sun
- 0
- Crowd Density
- Quiet / Uncrowded
- Average Expenses
- $ · Budget Friendly ($)
December in Cardiff scores 3.6/10 for sightseeing and cultural travel - ranked #12 of 12. Expect around 7°C, 115 mm of rain, and roughly 0 days with 6+ hours of sunshine this month.
Cardiff mixes a Victorian arcades core, Cardiff Castle, and bay regeneration with easy access to Welsh coast and valleys. Best window: late spring through early autumn.
December in Cardiff — off-season conditions
Expect 7°C (44°F) in December. A good month for city streets, viewpoints and long meals; leave swimming for another season.
115 mm of rain signals a properly wet month, with only almost no days with 6+ hours of sunshine to count on — build indoor options into the schedule.
That is 3.6/10 on the same scale — 12th of 12 months, versus 9/10 for the best month here.
Pack a mid-weight jacket, long sleeves and shoes you can walk 15 km in, a proper rain shell rather than an umbrella.
Expect low-season pricing, and crowds are light for this destination.
If your dates are flexible, June is materially better in Cardiff — 5.4 points higher on the same scale.
Frequently asked
- What is the weather like in Cardiff in December?
- In December, Cardiff averages 7°C, 115 mm of rain, and about 0 days with 6+ hours of sunshine. Its climate-comfort score is 3.6/10.
- Is December a good time to visit Cardiff?
- December earns a 3.6/10 climate-comfort score. Use the year-round chart to weigh the weather against your budget and crowd preferences.
- How much does it rain in Cardiff in December?
- Expect about 115 mm of rain in December. Average humidity is 94% and there are about 0 days with 6+ hours of sunshine.
Curated in Cardiff
Tickets & experiences
Things to do in Cardiff
Cardiff, United Kingdom. Live activities and tours from GetYourGuide, matched to this destination.