Swansea weather in December
Temperature, sea and sunshine in December: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in December
Poor
Best time to visit: June – September
What is the weather like in Swansea in December?
In December, Swansea is cold: daytime highs average 9 °C, and nights cool down to about 5 °C. The sea averages 9.8 °C – swimming is only for the hardy. The sun is scarce, with only about 2 hours a day. It rains often – on about 16 days, adding up to 133 mm. It is often windy, with gusts of around 30 km/h. All in all, December is not an ideal month for a holiday in Swansea.
December compared
How the weather changes from November to January. Tap a month to open it.
| NovemberNov | DecemberDec | JanuaryJan | |
|---|---|---|---|
| Score | 17 | 7 | 7 |
| Day | 11° | 9° | 8° |
| Night | 7° | 5° | 4° |
| Sea | 13° | 10° | 8° |
| Sun | 3 h | 2 h | 2 h |
| Rain days | 16 | 16 | 15 |
More details for December
- Daylight
- 7 h 51 min08:15 – 16:07
- UV index
- 0 · lowclear sky, noon (estimate)All months
- Muggy days
- 0 daysdew point 18 °C or moreAll months
- Wind
- 30 km/haverage daily peakAll months
- Cloud cover
- 73 %on averageAll months
- Hot days
- 0 days30 °C or more
- Time zone
- UTC+0Europe/London
How the score comes together
- Temperatureweight 50 %5 %
- Sunshineweight 20 %0 %
- Few rainy daysweight 30 %14 %
Each factor is rated from 0 to 100 % and weighted for the travel style “City break”.
What to pack in December
- Warm jacket
- Rain jacket or umbrella
- Windproof jacket
Swansea in December: quick answers
Is Swansea hot in December?
No. In December, Swansea is cold: daytime highs average 9 °C and nights drop to about 5 °C.
Can you swim in Swansea in December?
Only if you don't mind cold water: in December the sea averages just 9.8 °C. Comfortable swimming temperatures are not reached at any time of year.
Does it rain much in Swansea in December?
It rains often – on about 16 days, adding up to 133 mm.
Swansea month by month
The whole year in SwanseaAll destinations: United KingdomWhere to go in DecemberSea temperature in December
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences