Saint Helier
Jersey
Long-term weather forecast
Long-term weather forecast
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January weather forecast and Climate
Saint Helier, Jersey

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A shot of the Elizabeth Castle found on the Tidal Island in Saint Helier Parish, Jersey
A shot of the Elizabeth Castle found on the Tidal Island in Saint Helier Parish, Jersey
  • The average high temperature in January: 9.5°C

The warmest month (with the highest average high temperature) is August (21.2°C).
The month with the lowest average high temperature is January (9.5°C).

  • The average low temperature in January: 4.3°C

The month with the highest average low temperature is August (14.4°C).
The coldest month (with the lowest average low temperature) is February (4°C).

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  • The average rainfall in January: 90.4mm

The wettest month (with the highest rainfall) is December (110.5mm).
The driest month (with the lowest rainfall) is July (37mm).

  • The average rainfall days in January: 19 days

The month with the highest number of rainy days is December (19.5 days).
The month with the lowest number of rainy days is July (9.9 days).

  • The average sea temperature in January: 10°C

The best month for swimming (with the highest average sea temperature) is August (17°C).
Coldest months (with the lowest average sea temperature) are February and March (9°C).

  • The average daylight in January: 9h

Months with the longest days are June and July (Average daylight: 16h).
The month with shortest days is December (Average daylight: 8h).

  • The average sunshine in January: 2h

Months with most sunshine are May, June, July and August (Average sunshine: 8h).
Months with least sunshine are January and December (Average sunshine: 2).

  • The average UV index in January: 1

Months with the highest UV index are June and July (UV index 7).
Months with the lowest UV index are January, November and December (UV index 1).

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