January weather forecast and climate
Saint Helier, Jersey

A shot of the Elizabeth Castle found on Tidal Island in Saint Helier Parish, Jersey
A shot of the Elizabeth Castle found on Tidal Island in Saint Helier Parish, Jersey

Temperature

With an average high-temperature of 9.5°C (49.1°F) and an average low-temperature of 4.3°C (39.7°F), January is the coldest month.

Rainfall

In Saint Helier, in January, during 19 rainfall days, 90.4mm (3.6") of precipitation is typically accumulated. Throughout the year, in Saint Helier, there are 176.4 rainfall days, and 853.3mm (33.6") of precipitation is accumulated.

Sea temperature

In Saint Helier, Jersey, the average seawater temperature is 10°C (50°F). Swimming in 10°C (50°F) is considered life-threatening. Even a few minutes in 13°C (55.4°F) water is uncomfortable, and swimming below 10°C (50°F) may cause total loss of breathing control and cold shock, depending on a person's physique.

Daylight

The average length of the day is 8.8h.

Sunshine

January and December, with an average of 2h of sunshine, are months with the least sunshine.

UV index

January, November and December, with an average UV index of 1, are months with the lowest UV index.

What is the coldest month in Saint Helier?

The coldest month is January, with an average high-temperature of 9.5°C (49.1°F) and an average low-temperature of 4.3°C (39.7°F).

What is the temperature in January in Saint Helier?

In Saint Helier, in January, the average high-temperature is 9.5°C (49.1°F), and the average low-temperature is 4.3°C (39.7°F).

How much does it rain in Saint Helier in January?

In Saint Helier, Jersey, during January, the rain falls for 19 days and regularly aggregates up to 90.4mm (3.6") of precipitation.

What is the water temperature in January in Saint Helier?

In Saint Helier, Jersey, in January, the average water temperature is 10°C (50°F). Swimming in 10°C (50°F) is considered dangerous. Unprotected immersion in temperatures below 10°C (50°F) causes quickly maximum intensity cold shock with hyperventilation.

What is the average length of the day in January in Saint Helier?

The average length of the day in January in Saint Helier is 8.8h.

What is the month with the least sunshine in Saint Helier?

Months with the least sunshine in Saint Helier are January and December, with an average of 2h of sunshine.

How long on average sun shines in January in Saint Helier?

The average sunshine in January in Saint Helier is 2h.

What are the months with the lowest UV index in Saint Helier?

Months with the lowest UV index in Saint Helier are January, November and December, with an average UV index of 1.

What is the UV index intensity in January in Saint Helier?

In January, the average UV index in Saint Helier is 1.
Average temperature in January - Saint Helier, Jersey
  • 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).

  • 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).

Average rainfall in January - Saint Helier, Jersey
  • 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).

Average rainfall days in January - Saint Helier, Jersey
  • 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).

Average sea temperature in January - Saint Helier, Jersey
  • 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).

Average daylight in January / Average sunshine in January - Saint Helier, Jersey
  • Average daylight in January: 8.8h

The month with the longest days is June (Average daylight: 16.2h).
The month with shortest days is December (Average daylight: 8.3h).

  • 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).

Average UV index in January - Saint Helier, Jersey
  • 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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