Cardiff in December
In December, Cardiff averages 9°C (49°F) during the day and 5°C (41°F) at night, with frequent rain — about 18 days of the month see precipitation (139 mm total).
ShoulderConditions are cold — pack winter layers. Expect daily rain or showers, often in heavy bursts.
December is one of the wetter and less comfortable months in Cardiff. If your dates are flexible, consider a different time of year.
How December compares to the rest of the year in Cardiff
December is one of the coolest months in Cardiff (10th of 12) and one of the wettest months (1st of 12). Daytime temperature runs 5°C below the annual average (14°C). December runs 2°C cooler than November (11°C) and cools 1°C in January (8°C).
December sunrise & sunset in Cardiff
Times shown for Cardiff local time (Europe/London), calculated for the 15th of December. They shift by a few minutes day to day across the month.
Photography light in Cardiff — December
Golden-hour and blue-hour windows for the 15th of December, in Cardiff's local time. Use these for soft warm light (golden) or cool architectural twilight (blue).
📅 When to book — Cardiff in December
Travel writers usually only tell you when to go. Here's when to book flights and lodging for the best mix of price and availability, based on December's tier (Shoulder) and Cardiff's popularity.
Crowds & pricing — December in Cardiff
Cardiff is in a shoulder season month — fewer crowds, slightly lower prices, and a calmer atmosphere than peak weeks. Most major sights stay open with normal hours, though a handful of seasonal restaurants or boat trips may run reduced schedules. Many regulars consider these months the best time to visit because you trade a small amount of weather reliability for a much more pleasant on-the-ground experience.
Why this tier: Christmas / New Year travel surge
Sun & mosquito risk — December in Cardiff
UV is a clear-sky sea-level estimate — clouds, altitude, and reflective surfaces (snow, water) shift it ±30%. Mosquito risk is climate-derived only; for current disease advisories (dengue, malaria, zika) check the CDC or WHO travel pages before your trip.
Cardiff in other months
| Month | Avg high | Avg low | Rainfall | Rain days | Snow days |
|---|---|---|---|---|---|
| January | 8°C / 47°F | 3°C / 38°F | 111 mm | 17 | — |
| February | 9°C / 48°F | 3°C / 38°F | 102 mm | 14 | — |
| March | 10°C / 51°F | 4°C / 40°F | 97 mm | 16 | — |
| April | 13°C / 56°F | 5°C / 42°F | 61 mm | 10 | — |
| May | 16°C / 61°F | 9°C / 48°F | 82 mm | 12 | — |
| June | 19°C / 67°F | 12°C / 54°F | 67 mm | 13 | — |
| July | 21°C / 69°F | 14°C / 56°F | 80 mm | 14 | — |
| August | 20°C / 68°F | 13°C / 56°F | 105 mm | 15 | — |
| September | 18°C / 65°F | 12°C / 53°F | 87 mm | 12 | — |
| October | 15°C / 59°F | 10°C / 49°F | 134 mm | 15 | — |
| November | 11°C / 52°F | 6°C / 43°F | 114 mm | 16 | — |
| December | 9°C / 49°F | 5°C / 41°F | 139 mm | 18 | — |
Other cities with similar December weather
🌍 See the full ranked list of climate twins for Cardiff in December →
Frequently asked questions
How hot is Cardiff in December?
In December, Cardiff averages a high of 9°C (49°F) and a low of 5°C (41°F) — generally cool.
Does it rain a lot in Cardiff in December?
December is quite rainy in Cardiff, with about 18 rainy days on average.
Is December a good time to visit Cardiff?
December is cool but on the rainy side. It suits travelers who are comfortable with cool weather; check the month-by-month ranking to compare it against the rest of the year.
What should I pack for Cardiff in December?
Pack a warm jacket and layers, plus a compact umbrella or rain jacket. See the full December packing list for Cardiff for a complete, climate-based checklist.
Check the live 10-day forecast and sunrise/sunset.