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Climate in Guernsey (United Kingdom)


Average weather, temperature, rainfall, sunshine hours

Flag - United Kingdom

Guernsey, where it is located


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Climate chart - Guernsey
The climate of Guernsey is oceanic, cool and humid throughout the year.
The island is located in the English Channel, a short distance from the French coast of Lower Normandy, and belongs to Great Britain.

Precipitation amounts to 840 millimeters (33 inches) per year. The relatively wettest season is autumn, the least rainy is summer.

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 -3 °C (26.5 °F), although the coldest record is -7.8 °C (18 °F), 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 34.2 °C (93.6 °F) and was set in July 2022.

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.

St. Peter Port

The sun in Guernsey 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 1,865 hours of sunshine: we are at the levels of the English south coast, which is the highest in Great Britain.

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

Best Time


The best time to visit Guernsey 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.

Guernsey - Climate data


In Guernsey, the average temperature of the coldest month (February) is of 6.8 °C, that of the warmest month (August) is of 17 °C. Here are the average temperatures.
Guernsey - Average temperatures (1991-2020)
Temperatures (°C)
MonthMinMaxMean
January5.397.2
February4.88.86.8
March5.710.28
April6.912.39.6
May9.315.112.2
June11.717.714.7
July13.719.616.6
August14.119.817
September13.118.215.6
October1115.313.1
November8.412.110.2
December6.29.98
Year9.21411.6

Precipitation amounts to 840 millimeters per year: so, it is at an intermediate level. It ranges from 40 millimeters in the driest month (July) to 115 millimeters in the wettest one (December). Here is the average precipitation.
Guernsey - Average precipitation
MonthRain (mm)Days
January9515
February7011
March6512
April5510
May509
June457
July408
August508
September609
October9513
November10515
December11516
Year840131

The sea temperature ranges from 9 °C in February, March to 18 °C in August. Here are the average sea temperatures.
Guernsey - Sea temperature
MonthTemperatures (°C)
January10
February9
March9
April10
May12
June14
July17
August18
September17
October15
November13">
December12
Year13

There are on average around 1865 sunshine hours per year. Here are the average hours of sunshine per day.
Guernsey - Sunshine hours
MonthAverageTotal
January260
February385
March4130
April6.5195
May7.5235
June8245
July8250
August7.5230
September6180
October4115
November2.580
December260
Year5.11865

Guernsey - Weather by month

Based on the period 1991-2020
(January - February - March - April - May - June - July - August - September - October - November - December)


January is generally a quite mild month. The average temperature is of 7.2 °C, with a minimum of 5.3 °C and a maximum of 9 °C.
Cold thermometer iconOn the coldest nights of the month, the temperature usually drops to around 0.5 °C. However, it dropped to -4.5 °C in January 1997.
Warm thermometer iconOn the warmest days of the month, the temperature usually reaches around 12 °C. However, it reached 13.3 °C in January 2007.
Rain iconPrecipitation amounts to 95 mm, distributed over 15 days.
The day lasts on average 8 hours and 40 minutes.
Sun iconThere are on average 2 hours of sunshine per day. So, the sun shines 23% of the time.
The average humidity is 84%. Hence, the air is normally humid.
The average wind speed is of 24.7 kph.
Sea iconThe average sea temperature is of 10 °C. Therefore, the sea is very cold for swimming.


February, the coldest month of the year, is generally a quite mild month. The average temperature is of 6.8 °C, with a minimum of 4.8 °C and a maximum of 8.8 °C.
Cold thermometer iconOn the coldest nights of the month, the temperature usually drops to around 0 °C. However, it dropped to -7.2 °C in February 1991.
Warm thermometer iconOn the warmest days of the month, the temperature usually reaches around 12 °C. However, it reached 16.1 °C in February 2019.
Rain iconPrecipitation amounts to 70 mm, distributed over 11 days.
The day lasts on average 10 hours and 10 minutes.
Sun iconThere are on average 3 hours of sunshine per day. So, the sun shines 30% of the time.
The average humidity is 83%. Hence, the air is normally humid.
The average wind speed is of 23.1 kph.
Sea iconThe average sea temperature is of 9 °C. Therefore, the sea is very cold for swimming.


March is generally a quite mild month. The average temperature is of 8 °C, with a minimum of 5.7 °C and a maximum of 10.2 °C.
Cold thermometer iconOn the coldest nights of the month, the temperature usually drops to around 2 °C. However, it dropped to -3 °C in March 2018.
Warm thermometer iconOn the warmest days of the month, the temperature usually reaches around 15 °C. However, it reached 18.6 °C in March 2012.
Rain iconPrecipitation amounts to 65 mm, distributed over 12 days.
The day lasts on average 12 hours and 0 minutes.
Sun iconThere are on average 4 hours of sunshine per day. So, the sun shines 34% of the time.
The average humidity is 83%. Hence, the air is normally humid.
The average wind speed is of 21.5 kph.
Sea iconThe average sea temperature is of 9 °C. Therefore, the sea is very cold for swimming.


April is generally a mild month. The average temperature is of 9.6 °C, with a minimum of 6.9 °C and a maximum of 12.3 °C.
Cold thermometer iconOn the coldest nights of the month, the temperature usually drops to around 3 °C. However, it dropped to 0.1 °C in April 2013.
Warm thermometer iconOn the warmest days of the month, the temperature usually reaches around 18.5 °C. However, it reached 24.5 °C in April 2020.
Rain iconPrecipitation amounts to 55 mm, distributed over 10 days.
The day lasts on average 13 hours and 50 minutes.
Sun iconThere are on average 6.5 hours of sunshine per day. So, the sun shines 47% of the time.
The average humidity is 82%. Hence, the air is normally humid.
The average wind speed is of 19.5 kph.
Sea iconThe average sea temperature is of 10 °C. Therefore, the sea is very cold for swimming.


May is generally a mild month. The average temperature is of 12.2 °C, with a minimum of 9.3 °C and a maximum of 15.1 °C.
Cold thermometer iconOn the coldest nights of the month, the temperature usually drops to around 6 °C. However, it dropped to 1.9 °C in May 1997.
Warm thermometer iconOn the warmest days of the month, the temperature usually reaches around 22 °C. However, it reached 25.9 °C in May 2003.
Rain iconPrecipitation amounts to 50 mm, distributed over 9 days.
The day lasts on average 15 hours and 25 minutes. So the days are long.
Sun iconThere are on average 7.5 hours of sunshine per day. So, the sun shines 49% of the time.
The average humidity is 82%. Hence, the air is normally humid.
The average wind speed is of 19.1 kph.
Sea iconThe average sea temperature is of 12 °C. Therefore, the sea is very cold for swimming.


June is generally a very mild month. The average temperature is of 14.7 °C, with a minimum of 11.7 °C and a maximum of 17.7 °C.
Cold thermometer iconOn the coldest nights of the month, the temperature usually drops to around 8.5 °C. However, it dropped to 7 °C in June 1991.
Warm thermometer iconOn the warmest days of the month, the temperature usually reaches around 24.5 °C. However, it reached 29.8 °C in June 1995.
Rain iconPrecipitation amounts to 45 mm, distributed over 7 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.
Sun iconThere are on average 8 hours of sunshine per day. So, the sun shines 51% of the time.
The average humidity is 83%. Hence, the air is normally humid.
The average wind speed is of 18.2 kph.
Sea iconThe average sea temperature is of 14 °C. Therefore, the sea is very cold for swimming.


July is generally a very mild month. The average temperature is of 16.6 °C, with a minimum of 13.7 °C and a maximum of 19.6 °C.
Cold thermometer iconOn the coldest nights of the month, the temperature usually drops to around 11 °C. However, it dropped to 8.7 °C in July 1996.
Warm thermometer iconOn the warmest days of the month, the temperature usually reaches around 26 °C. However, it reached 32.6 °C in July 2016.
Rain iconPrecipitation amounts to 40 mm, distributed over 8 days.
The day lasts on average 15 hours and 40 minutes. So the days are long.
Sun iconThere are on average 8 hours of sunshine per day. So, the sun shines 52% of the time.
The average humidity is 83%. Hence, the air is normally humid.
The average wind speed is of 17.9 kph.
Sea iconThe average sea temperature is of 17 °C. Therefore, the sea is cold for swimming.


August, the warmest month of the year, is generally a very mild month. The average temperature is of 17 °C, with a minimum of 14.1 °C and a maximum of 19.8 °C.
Cold thermometer iconOn the coldest nights of the month, the temperature usually drops to around 11.5 °C. However, it dropped to 10.3 °C in August 1993.
Warm thermometer iconOn the warmest days of the month, the temperature usually reaches around 25.5 °C. However, it reached 32 °C in August 2020.
Rain iconPrecipitation amounts to 50 mm, distributed over 8 days.
The day lasts on average 14 hours and 20 minutes. So the days are long.
Sun iconThere are on average 7.5 hours of sunshine per day. So, the sun shines 52% of the time.
The average humidity is 84%. Hence, the air is normally humid.
The average wind speed is of 17.1 kph.
Sea iconThe average sea temperature is of 18 °C. Therefore, the sea is cold for swimming.


September is generally a very mild month. The average temperature is of 15.6 °C, with a minimum of 13.1 °C and a maximum of 18.2 °C.
Cold thermometer iconOn the coldest nights of the month, the temperature usually drops to around 9.5 °C. However, it dropped to 7.9 °C in September 2010.
Warm thermometer iconOn the warmest days of the month, the temperature usually reaches around 23 °C. However, it reached 28.1 °C in September 2020.
Rain iconPrecipitation amounts to 60 mm, distributed over 9 days.
The day lasts on average 12 hours and 30 minutes.
Sun iconThere are on average 6 hours of sunshine per day. So, the sun shines 48% of the time.
The average humidity is 82%. Hence, the air is normally humid.
The average wind speed is of 18.8 kph.
Sea iconThe average sea temperature is of 17 °C. Therefore, the sea is cold for swimming.


October is generally a mild month. The average temperature is of 13.1 °C, with a minimum of 11 °C and a maximum of 15.3 °C.
Cold thermometer iconOn the coldest nights of the month, the temperature usually drops to around 7 °C. However, it dropped to 3.5 °C in October 2003.
Warm thermometer iconOn the warmest days of the month, the temperature usually reaches around 19 °C. However, it reached 22.2 °C in October 2011.
Rain iconPrecipitation amounts to 95 mm, distributed over 13 days.
The day lasts on average 10 hours and 40 minutes.
Sun iconThere are on average 4 hours of sunshine per day. So, the sun shines 35% of the time.
The average humidity is 82%. Hence, the air is normally humid.
The average wind speed is of 21.5 kph.
Sea iconThe average sea temperature is of 15 °C. Therefore, the sea is cold for swimming.


November is generally a mild month. The average temperature is of 10.2 °C, with a minimum of 8.4 °C and a maximum of 12.1 °C.
Cold thermometer iconOn the coldest nights of the month, the temperature usually drops to around 4 °C. However, it dropped to -0.8 °C in November 2010.
Warm thermometer iconOn the warmest days of the month, the temperature usually reaches around 15.5 °C. However, it reached 17.1 °C in November 2016.
Rain iconPrecipitation amounts to 105 mm, distributed over 15 days.
The day lasts on average 9 hours and 5 minutes.
Sun iconThere are on average 2.5 hours of sunshine per day. So, the sun shines 29% of the time.
The average humidity is 82%. Hence, the air is normally humid.
The average wind speed is of 23.2 kph.
Sea iconThe average sea temperature is of 13 °C. Therefore, the sea is very cold for swimming.


December is generally a quite mild month. The average temperature is of 8 °C, with a minimum of 6.2 °C and a maximum of 9.9 °C.
Cold thermometer iconOn the coldest nights of the month, the temperature usually drops to around 1.5 °C. However, it dropped to -1.8 °C in December 1991.
Warm thermometer iconOn the warmest days of the month, the temperature usually reaches around 13 °C. However, it reached 14.4 °C in December 2015.
Rain iconPrecipitation amounts to 115 mm, 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.
Sun iconThere are on average 2 hours of sunshine per day. So, the sun shines 23% of the time.
The average humidity is 83%. Hence, the air is normally humid.
The average wind speed is of 24.9 kph.
Sea iconThe average sea temperature is of 12 °C. Therefore, the sea is very cold for swimming.

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