Monthly 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
January, like December, is a chilly winter month in Saint Helier, Jersey, with average temperature fluctuating between 4.3°C (39.7°F) and 9.5°C (49.1°F). January is the coldest month, with an average high-temperature of 9.5°C (49.1°F) and an average low-temperature of 4.3°C (39.7°F). Weather in January »
The last month of the winter, February, is also a chilly month in Saint Helier, Jersey, with average temperature fluctuating between 4°C (39.2°F) and 9.7°C (49.5°F). The average high-temperature, is 9.7°C (49.5°F), while the average low-temperature is 4°C (39.2°F). Weather in February »

March, the first month of the spring, in Saint Helier, is a cool month, with average temperature varying between 10.9°C (51.6°F) and 5.4°C (41.7°F). In Saint Helier, in March, the average high-temperature is 10.9°C (51.6°F), and the average low-temperature is 5.4°C (41.7°F). Weather in March »

April is a mild spring month in Saint Helier, Jersey, with temperature in the range of an average high of 13.2°C (55.8°F) and an average low of 6.6°C (43.9°F). In April, the average high-temperature is 13.2°C (55.8°F), and the average low-temperature is 6.6°C (43.9°F). Weather in April »

The last month of the spring, May, is a comfortable month in Saint Helier, Jersey, with average temperature ranging between min. 9.4°C (48.9°F) and max. 16.6°C (61.9°F). In Saint Helier, Jersey, the average high-temperature is 16.6°C (61.9°F), and the average low-temperature is 9.4°C (48.9°F). Weather in May »

June, the first month of the summer, in Saint Helier, is still a comfortable month, with average temperature ranging between min. 11.8°C (53.2°F) and max. 19.2°C (66.6°F). In Saint Helier, in June, the average high-temperature is 19.2°C (66.6°F), and the average low-temperature is 11.8°C (53.2°F). Weather in June »

July is a pleasant summer month in Saint Helier, Jersey, with average temperature varying between 14°C (57.2°F) and 21.1°C (70°F). The average high-temperature, is 21.1°C (70°F), while the average low-temperature is 14°C (57.2°F). Weather in July »

The last month of the summer, August, is another pleasant month in Saint Helier, Jersey, with temperature in the range of an average low of 14.4°C (57.9°F) and an average high of 21.2°C (70.2°F). August is the warmest month, with an average high-temperature of 21.2°C (70.2°F) and an average low-temperature of 14.4°C (57.9°F). Weather in August »

September, the first month of the autumn, in Saint Helier, is still a comfortable month, with average temperature fluctuating between 19.3°C (66.7°F) and 12.9°C (55.2°F). The average high-temperature, in September, is 19.3°C (66.7°F), while the average low-temperature is 12.9°C (55.2°F). Weather in September »

October, the same as September, in Saint Helier, Jersey, is another mild autumn month, with temperature in the range of an average low of 10.6°C (51.1°F) and an average high of 15.7°C (60.3°F). In Saint Helier, in October, the average high-temperature is 15.7°C (60.3°F), and the average low-temperature is 10.6°C (51.1°F). Weather in October »

The last month of the autumn, November, is another cool month in Saint Helier, Jersey, with average temperature ranging between max. 11.9°C (53.4°F) and min. 7.4°C (45.3°F). In Saint Helier, Jersey, the average high-temperature is 11.9°C (53.4°F), and the average low-temperature is 7.4°C (45.3°F). Weather in November »

The first month of the winter, December, is still a cool month in Saint Helier, Jersey, with average temperature fluctuating between 5.5°C (41.9°F) and 10.4°C (50.7°F). In December, the average high-temperature is 10.4°C (50.7°F), and the average low-temperature is 5.5°C (41.9°F). Weather in December »

What is the coldest month in Saint Helier?

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.

How many days does it rain in Saint Helier?

In Saint Helier, Jersey, during the entire year, the rain falls for 176.4 days and collects up to 853.3mm (33.6") of precipitation.

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

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

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

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

When is the sea coldest in Saint Helier?

February and March, with an average sea temperature of 9°C (48.2°F), are months with the coldest seawater in Saint Helier. Swimming in 9°C (48.2°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.

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

Months with the most sunshine in Saint Helier are May through August, with an average of 8h of sunshine.

When are the longest days in Saint Helier?

June has the longest days of the year in Saint Helier, with an average of 16.2h of daylight.

When is the highest UV index in Saint Helier?

Months with the highest UV index are June and July, with an average maximum UV index of 7.

What is the driest month in Saint Helier?

The month with the least rainfall in Saint Helier is July when the rain falls for 9.9 days and typically collects 37mm (1.5") of precipitation.

What is the warmest month in Saint Helier?

August is the warmest month in Saint Helier, with an average high-temperature of 21.2°C (70.2°F) and an average low-temperature of 14.4°C (57.9°F).

What month is the sea warmest in Saint Helier?

The month with the warmest seawater is August, with an average sea temperature of 17°C (62.6°F). Swimming in 17°C (62.6°F) is not enjoyable for the majority. Controlling breathing becomes progressively more difficult as surface water temperature decreases below 21°C (69.8°F).

What is the wettest month in Saint Helier?

The month with the most rainfall is December when the rain falls for 19.5 days and typically aggregates up to 110.5mm (4.4") of precipitation.

What is the month with the shortest days in Saint Helier?

The month with the shortest days in Saint Helier, Jersey, is December, with an average of 8.3h of daylight.
Average temperature - Saint Helier, Jersey
Average rainfall - Saint Helier, Jersey

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

Average rainfall days - Saint Helier, Jersey

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 - Saint Helier, Jersey
Average daylight / Average sunshine - Saint Helier, Jersey

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

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 - Saint Helier, Jersey
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