Climate - Jersey (United Kingdom)

The climate of Jersey is oceanic, cool and humid throughout the year.
Jersey is the largest of the Channel islands, which are found a short distance from the French coast of Lower Normandy, and belong to Great Britain. The main islands are Jersey, Guernsey and Alderney.
The climate of Jersey is very similar to that of the neighboring island of Guernsey, although it is slightly more exposed to both cold and heat, since it is closer to the continent.
The average temperature ranges from 6.5 °C (43.7 °F) in February to 17.5 °C (63.5 °F) in August. Here are the average temperatures.

Precipitation amounts to 865 millimeters (34 inches) per year. The relatively wettest season is autumn, the least rainy is summer. Here is the average precipitation.

Winter, from December to February, is quite cold: temperatures are not so low, but wind and humidity can increase the sensation of cold. The sky is often cloudy, and rainfall is frequent. Sometimes, intense Atlantic depressions can cause wind storms.
Snowfalls are relatively rare and not abundant. Usually, cold spells are not intense and do not last long. The temperature rarely drops below -5 °C (23 °F), however, the coldest record is -10.9 °C (12.4 °F) and was set in January 1963.

In spring, from March to May, the temperature slowly rises, and Atlantic fronts become a bit less frequent. In May, it is often still quite cold, especially in the first half of the month.

Summer, from June to August, is cool, with quite frequent rains, but also with a bit of good weather. Sometimes fog can form.
Hot days are rare: the temperature may not reach 25 °C (77 °F) for an entire month. However, it can sometimes exceed 30 °C (86 °F). The highest record is 36 °C (96.8 °F) and was set in July 2019.

Autumn, from September to November, is gray, cloudy and rainy, and with each passing week, it gets progressively colder. In November, the wind is often moderate or strong.



The sun in Jersey does not shine often from October to March (although it can come out between one disturbance and another), while from April to September, it shines for an acceptable number of hours. In one year, there are 1,900 hours of sunshine: we are at the levels of the English south coast, which is the highest in Great Britain. Here are the average sunshine hours per day.

The sea is cold all year round, however, from July to September the water temperature reaches 17/18 °C (62/64 °F). Here are the average sea temperatures.

Best Time

The best time to visit Jersey runs from June to mid-September. July and August are the warmest months, or the least cool, however, it's better to bring a sweatshirt and a light jacket also in midsummer.

Jersey - Weather by month

Based on the period 1991-2020

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In January, the weather in Jersey is usually quite mild. The average temperature is of 6.7 °C (44 °F), with a minimum of 4.7 °C (40.4 °F) and a maximum of 8.6 °C (47.6 °F).
On the coldest nights of the month, the temperature usually drops to around -1 °C (30 °F). However, it dropped to -6.5 °C (20.3 °F) in January 1997.
On the warmest days of the month, the temperature usually reaches around 12 °C (54 °F). However, it reached 13.4 °C (56.1 °F) in January 1993.
Precipitation amounts to 95 mm (3.7 in), distributed over 15 days.
The day lasts on average 8 hours and 40 minutes.
There are on average 2 hours of sunshine per day. So, the sun shines 25% of the time.
The average humidity is 86%. Hence, the air is normally humid.
The average wind speed is 25 kph (15 mph).
The average sea temperature is of 10 °C (50 °F). Therefore, the sea is very cold for swimming.

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In February, the coldest month of the year, the weather in Jersey is usually quite cold. The average temperature is of 6.5 °C (44 °F), with a minimum of 4.3 °C (39.7 °F) and a maximum of 8.8 °C (47.8 °F).
On the coldest nights of the month, the temperature usually drops to around -1 °C (30 °F). However, it dropped to -8.7 °C (16.3 °F) in February 1991.
On the warmest days of the month, the temperature usually reaches around 12.5 °C (54.5 °F). However, it reached 16.6 °C (61.9 °F) in February 2019.
Precipitation amounts to 70 mm (2.8 in), distributed over 12 days.
The day lasts on average 10 hours and 10 minutes.
There are on average 3.5 hours of sunshine per day. So, the sun shines 32% of the time.
The average humidity is 84%. Hence, the air is normally humid.
The average wind speed is 23 kph (14 mph).
The average sea temperature is of 9 °C (48 °F). Therefore, the sea is very cold for swimming.

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In March, the weather in Jersey is usually quite mild. The average temperature is of 8.0 °C (46 °F), with a minimum of 5.4 °C (41.7 °F) and a maximum of 10.7 °C (51.2 °F).
On the coldest nights, which normally occur at the beginning of the month, the temperature usually drops to around 1 °C (34 °F). However, it dropped to -3.4 °C (25.9 °F) in March 2018.
On the warmest days, which normally occur at the end of the month, the temperature usually reaches around 16 °C (61 °F). However, it reached 20.3 °C (68.5 °F) in March 2012.
Precipitation amounts to 65 mm (2.6 in), distributed over 12 days.
The day lasts on average 12 hours and 0 minutes.
There are on average 4.5 hours of sunshine per day. So, the sun shines 36% of the time.
The average humidity is 82%. Hence, the air is normally humid.
The average wind speed is 22 kph (14 mph).
The average sea temperature is of 9 °C (48 °F). Therefore, the sea is very cold for swimming.

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In April, the weather in Jersey is usually mild. The average temperature is of 10.0 °C (50 °F), with a minimum of 6.8 °C (44.3 °F) and a maximum of 13.1 °C (55.5 °F).
On the coldest nights, which normally occur at the beginning of the month, the temperature usually drops to around 3 °C (37 °F). However, it dropped to -0.7 °C (30.7 °F) in April 2013.
On the warmest days, which normally occur at the end of the month, the temperature usually reaches around 20 °C (68 °F). However, it reached 25.2 °C (77.4 °F) in April 2020.
Precipitation amounts to 55 mm (2.2 in), distributed over 10 days.
The day lasts on average 13 hours and 50 minutes.
There are on average 6.5 hours of sunshine per day. So, the sun shines 47% of the time.
The average humidity is 80%. Hence, the air is normally humid.
The average wind speed is 20 kph (13 mph).
The average sea temperature is of 10 °C (50 °F). Therefore, the sea is very cold for swimming.

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In May, the weather in Jersey is usually mild. The average temperature is of 12.6 °C (55 °F), with a minimum of 9.4 °C (48.9 °F) and a maximum of 15.9 °C (60.6 °F).
On the coldest nights, which normally occur at the beginning of the month, the temperature usually drops to around 5.5 °C (41.5 °F). However, it dropped to 1.7 °C (35.1 °F) in May 2010.
On the warmest days, which normally occur at the end of the month, the temperature usually reaches around 23.5 °C (74.5 °F). However, it reached 27.6 °C (81.7 °F) in May 2017.
Precipitation amounts to 55 mm (2.2 in), distributed over 9 days.
The day lasts on average 15 hours and 25 minutes. So the days are long.
There are on average 7.5 hours of sunshine per day. So, the sun shines 50% of the time.
The average humidity is 80%. Hence, the air is normally humid.
The average wind speed is 19 kph (12 mph).
The average sea temperature is of 12 °C (53.5 °F). Therefore, the sea is very cold for swimming.

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In June, the weather in Jersey is usually very mild. The average temperature is of 15.2 °C (59 °F), with a minimum of 11.9 °C (53.5 °F) and a maximum of 18.6 °C (65.4 °F).
On the coldest nights, which normally occur at the beginning of the month, the temperature usually drops to around 8.5 °C (47.5 °F). However, it dropped to 6.5 °C (43.7 °F) in June 1991.
On the warmest days, which normally occur at the end of the month, the temperature usually reaches around 27 °C (80.5 °F). However, it reached 32.5 °C (90.5 °F) in June 2017.
Precipitation amounts to 50 mm (2 in), distributed over 8 days.
The day lasts on average 16 hours and 10 minutes. So the days are long. June 21, the summer solstice, is the longest day of the year in the Northern Hemisphere.
There are on average 8 hours of sunshine per day. So, the sun shines 51% of the time.
The average humidity is 81%. Hence, the air is normally humid.
The average wind speed is 18 kph (11 mph).
The average sea temperature is of 14 °C (57 °F). Therefore, the sea is very cold for swimming.

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In July, the weather in Jersey is usually very mild. The average temperature is of 17.1 °C (63 °F), with a minimum of 13.9 °C (57 °F) and a maximum of 20.4 °C (68.7 °F).
On the coldest nights of the month, the temperature usually drops to around 11 °C (51.5 °F). However, it dropped to 9.3 °C (48.7 °F) in July 2013.
On the warmest days of the month, the temperature usually reaches around 27.5 °C (81.5 °F). However, it reached 36 °C (96.8 °F) in July 2019.
Precipitation amounts to 45 mm (1.8 in), distributed over 7 days.
The day lasts on average 15 hours and 40 minutes. So the days are long.
There are on average 8 hours of sunshine per day. So, the sun shines 52% of the time.
The average humidity is 81%. Hence, the air is normally humid.
The average wind speed is 18 kph (11 mph).
The average sea temperature is of 17 °C (62.5 °F). Therefore, the sea is cold for swimming.

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In August, the warmest month of the year, the weather in Jersey is usually very mild. The average temperature is of 17.5 °C (63 °F), with a minimum of 14.3 °C (57.8 °F) and a maximum of 20.6 °C (69.1 °F).
On the coldest nights of the month, the temperature usually drops to around 11 °C (51.5 °F). However, it dropped to 7.7 °C (45.9 °F) in August 2011.
On the warmest days of the month, the temperature usually reaches around 28 °C (82 °F). However, it reached 34.3 °C (93.7 °F) in August 2003.
Precipitation amounts to 50 mm (2 in), distributed over 7 days.
The day lasts on average 14 hours and 20 minutes. So the days are long.
There are on average 7.5 hours of sunshine per day. So, the sun shines 53% of the time.
The average humidity is 81%. Hence, the air is normally humid.
The average wind speed is 18 kph (11 mph).
The average sea temperature is of 18 °C (64.5 °F). Therefore, the sea is cold for swimming.

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In September, the weather in Jersey is usually very mild. The average temperature is of 15.9 °C (61 °F), with a minimum of 12.9 °C (55.2 °F) and a maximum of 18.9 °C (66 °F).
On the coldest nights, which normally occur at the end of the month, the temperature usually drops to around 9 °C (48.5 °F). However, it dropped to 6.5 °C (43.7 °F) in September 2018.
On the warmest days, which normally occur at the beginning of the month, the temperature usually reaches around 24.5 °C (76 °F). However, it reached 30.8 °C (87.4 °F) in September 2020.
Precipitation amounts to 65 mm (2.6 in), distributed over 9 days.
The day lasts on average 12 hours and 30 minutes.
There are on average 6 hours of sunshine per day. So, the sun shines 49% of the time.
The average humidity is 80%. Hence, the air is normally humid.
The average wind speed is 20 kph (12 mph).
The average sea temperature is of 17 °C (62.5 °F). Therefore, the sea is cold for swimming.

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In October, the weather in Jersey is usually mild. The average temperature is of 13.1 °C (56 °F), with a minimum of 10.6 °C (51.2 °F) and a maximum of 15.5 °C (59.9 °F).
On the coldest nights, which normally occur at the end of the month, the temperature usually drops to around 5.5 °C (42 °F). However, it dropped to 0.4 °C (32.7 °F) in October 1997.
On the warmest days, which normally occur at the beginning of the month, the temperature usually reaches around 19.5 °C (67.5 °F). However, it reached 25.6 °C (78.1 °F) in October 2011.
Precipitation amounts to 105 mm (4.1 in), distributed over 14 days.
The day lasts on average 10 hours and 40 minutes.
There are on average 4 hours of sunshine per day. So, the sun shines 36% of the time.
The average humidity is 82%. Hence, the air is normally humid.
The average wind speed is 22 kph (14 mph).
The average sea temperature is of 15 °C (59 °F). Therefore, the sea is cold for swimming.

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In November, the weather in Jersey is usually mild. The average temperature is of 9.9 °C (50 °F), with a minimum of 7.9 °C (46.2 °F) and a maximum of 12 °C (53.6 °F).
On the coldest nights, which normally occur at the end of the month, the temperature usually drops to around 3 °C (37 °F). However, it dropped to -3 °C (26.6 °F) in November 2010.
On the warmest days, which normally occur at the beginning of the month, the temperature usually reaches around 15.5 °C (60 °F). However, it reached 17.6 °C (63.7 °F) in November 2016.
Precipitation amounts to 105 mm (4.1 in), distributed over 15 days.
The day lasts on average 9 hours and 5 minutes.
There are on average 2.5 hours of sunshine per day. So, the sun shines 29% of the time.
The average humidity is 83%. Hence, the air is normally humid.
The average wind speed is 24 kph (15 mph).
The average sea temperature is of 13 °C (55.5 °F). Therefore, the sea is very cold for swimming.

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In December, the weather in Jersey is usually quite mild. The average temperature is of 7.5 °C (45 °F), with a minimum of 5.4 °C (41.8 °F) and a maximum of 9.5 °C (49.2 °F).
On the coldest nights of the month, the temperature usually drops to around -0.5 °C (31.5 °F). However, it dropped to -5.1 °C (22.8 °F) in December 1991.
On the warmest days of the month, the temperature usually reaches around 13 °C (55.5 °F). However, it reached 14.7 °C (58.5 °F) in December 2015.
Precipitation amounts to 110 mm (4.3 in), distributed over 16 days.
The day lasts on average 8 hours and 10 minutes. December 21, the winter solstice, is the shortest day of the year in the Northern Hemisphere.
There are on average 2 hours of sunshine per day. So, the sun shines 25% of the time.
The average humidity is 85%. Hence, the air is normally humid.
The average wind speed is 25 kph (15 mph).
The average sea temperature is of 12 °C (53.5 °F). Therefore, the sea is very cold for swimming.