Monthly climate guide
Cardiff weather in December
December in Cardiff is typically cool, with average daytime highs around 9°C (48°F) and night-time lows near 5°C (41°F). The month usually brings about 124 mm of rain (wet) and is often cloudy. Daytime highs are 2°C cooler than November and about the same as January.
What stands out in December
- Cardiff is usually about 2°C cooler than Tenby, 110 km away, in December.
- It's one of the greyest months, with cloud cover near 83%.
- Days and nights are close, only about 4°C apart.
- December is among Cardiff's three coolest months.
It's usually the wettest month of the year.
Avg high
9°C
48°F
Avg low
5°C
41°F
Rainfall
124 mm
wet
Humidity
93%
relative
Sky
83%
cloud · often cloudy
Cardiff weather by month
Show the monthly averages as a table
| Month | Avg high | Avg low | Rain | Humidity | Cloud cover |
|---|---|---|---|---|---|
| January | 7°C / 45°F | 3°C / 38°F | 97 mm | 93% | 80% |
| February | 8°C / 46°F | 3°C / 37°F | 77 mm | 91% | 79% |
| March | 9°C / 49°F | 3°C / 38°F | 68 mm | 89% | 74% |
| April | 12°C / 54°F | 5°C / 41°F | 56 mm | 85% | 69% |
| May | 15°C / 60°F | 8°C / 46°F | 62 mm | 82% | 68% |
| June | 18°C / 64°F | 11°C / 52°F | 83 mm | 82% | 71% |
| July | 20°C / 68°F | 13°C / 55°F | 66 mm | 81% | 66% |
| August | 20°C / 67°F | 13°C / 55°F | 96 mm | 84% | 74% |
| September | 18°C / 64°F | 11°C / 52°F | 73 mm | 85% | 69% |
| October | 14°C / 58°F | 9°C / 48°F | 98 mm | 89% | 76% |
| November | 10°C / 51°F | 6°C / 42°F | 104 mm | 92% | 80% |
| December | 9°C / 48°F | 5°C / 41°F | 124 mm | 93% | 83% |
What to pack for December
- A proper insulated winter coat
- A hat, scarf and gloves
- A compact umbrella or packable rain jacket
- Water-resistant shoes
Is December a good time to visit Cardiff?
Compare the months in the chart above to find your ideal window.
Best time to visit Cardiff →Other United Kingdom cities in December
Cite or embed this data
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Cardiff weather in December. WeatherCompare, 2026 (NASA POWER / ERA5, 2011–2020 monthly averages). https://weathercompare.eu/weather/uk/cardiff/december
<a href="https://weathercompare.eu/weather/uk/cardiff/december">Cardiff weather in December</a> (WeatherCompare)
<iframe src="https://weathercompare.eu/embed/uk/cardiff" width="300" height="160" style="border:0;border-radius:12px" loading="lazy" title="Cardiff weather in December"></iframe> <p style="font-size:12px"><a href="https://weathercompare.eu/weather/uk/cardiff/december">Cardiff weather in December</a> – WeatherCompare</p>
Cardiff in December: quick answers
Is December a good time to visit Cardiff?
December is cool in Cardiff, with highs around 9°C. Better for museums and city walks than the beach, and usually quieter.
How warm is Cardiff in December?
Average highs are about 9°C (48°F) and average lows about 5°C (41°F), based on 10 years of daily data.
Does it rain a lot in Cardiff in December?
Cardiff typically gets around 124 mm of rain in December — wet. It's usually the wettest month of the year.
Figures are long-term averages for the area around Cardiff (NASA POWER / ERA5, 2011–2020), not a forecast for a specific year. For upcoming days, see the live multi-source forecast.