Saint Helier weather in January
Temperature, sea and sunshine in January: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in January
Poor
Best time to visit: June – September
What is the weather like in Saint Helier in January?
In January, Saint Helier is cold: daytime highs average 9 °C, and nights cool down to about 7 °C. The sea averages 9.7 °C – swimming is only for the hardy. The sun is scarce, with only about 2 hours a day. It rains often – on about 14 days, adding up to 85 mm. It is often windy, with gusts of around 32 km/h. All in all, January is not an ideal month for a holiday in Saint Helier.
January compared
How the weather changes from December to February. Tap a month to open it.
| DecemberDec | JanuaryJan | FebruaryFeb | |
|---|---|---|---|
| Score | 16 | 13 | 18 |
| Day | 10° | 9° | 9° |
| Night | 8° | 7° | 7° |
| Sea | 11° | 10° | 9° |
| Sun | 2 h | 2 h | 3 h |
| Rain days | 16 | 14 | 12 |
More details for January
- Daylight
- 8 h 38 min07:58 – 16:36
- 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 %10 %
- Sunshineweight 20 %0 %
- Few rainy daysweight 30 %26 %
Each factor is rated from 0 to 100 % and weighted for the travel style “City break”.
What to pack in January
- Warm jacket
- Rain jacket or umbrella
- Windproof jacket
Saint Helier in January: quick answers
Is Saint Helier hot in January?
No. In January, Saint Helier is cold: daytime highs average 9 °C and nights drop to about 7 °C.
Can you swim in Saint Helier in January?
Only if you don't mind cold water: in January the sea averages just 9.7 °C. Comfortable swimming temperatures are not reached at any time of year.
Does it rain much in Saint Helier in January?
It rains often – on about 14 days, adding up to 85 mm.
Saint Helier month by month
The whole year in Saint HelierAll destinations: JerseyWhere to go in JanuarySea temperature in January
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