Saint Helier 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 Saint Helier in December?
In December, Saint Helier is cool: daytime highs average 10 °C, and nights cool down to about 8 °C. The sea averages 11.3 °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 103 mm. It is often windy, with gusts of around 32 km/h. All in all, December is not an ideal month for a holiday in Saint Helier.
December compared
How the weather changes from November to January. Tap a month to open it.
| NovemberNov | DecemberDec | JanuaryJan | |
|---|---|---|---|
| Score | 27 | 16 | 13 |
| Day | 12° | 10° | 9° |
| Night | 10° | 8° | 7° |
| Sea | 14° | 11° | 10° |
| Sun | 3 h | 2 h | 2 h |
| Rain days | 16 | 16 | 14 |
More details for December
- Daylight
- 8 h 14 min07:56 – 16:11
- UV index
- 1 · lowclear sky, noon (estimate)All months
- Muggy days
- 0 daysdew point 18 °C or moreAll months
- Wind
- 32 km/haverage daily peakAll months
- Cloud cover
- 75 %on averageAll months
- Hot days
- 0 days30 °C or more
- Time zone
- UTC+0Europe/Jersey
How the score comes together
- Temperatureweight 50 %22 %
- Sunshineweight 20 %0 %
- Few rainy daysweight 30 %16 %
Each factor is rated from 0 to 100 % and weighted for the travel style “City break”.
What to pack in December
- A jumper for the evenings
- Rain jacket or umbrella
- Windproof jacket
Saint Helier in December: quick answers
Is Saint Helier hot in December?
No. In December, Saint Helier is cool: daytime highs average 10 °C and nights drop to about 8 °C.
Can you swim in Saint Helier in December?
Only if you don't mind cold water: in December the sea averages just 11.3 °C. Comfortable swimming temperatures are not reached at any time of year.
Does it rain much in Saint Helier in December?
It rains often – on about 16 days, adding up to 103 mm.
Saint Helier month by month
The whole year in Saint HelierAll destinations: JerseyWhere 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