Climate and monthly weather forecastGuernsey, Guernsey
Climate and monthly weather forecast
The climate of Guernsey
Let's start with some foundational facts. The island of Guernsey, belonging to the Channel Islands in the English Channel, is marked by a Marine west coast climate, known as Cfb in the Köppen climate classification. Known for moderate temperatures and consistent humidity levels, the weather in Guernsey remains relatively balanced throughout the year.The average monthly temperatures span a range from 7.8°C (46°F) to 17.8°C (64°F), with the warmest month being August and the coldest month being February. Humidity levels remain fairly stable, wavering slightly between 77% and 84%. Fluctuations in rainfall are more noticeable, with a peak of 87mm (3.43") in November and a relative low of 26mm (1.02") in July. The share of sunny days shows a lift from 5.5 in January to 16.3 in May, while UV index values remain in the moderate zone from 2 to 5 throughout the year.
An interesting fact about Guernsey's weather and climate is the low variability in wind speed, which hovers between 21.9km/h (13.6mph) and 36km/h (22.4mph). The average wind gust velocity shows more seasonal variation, with a peak of 49.8km/h (30.9mph) in December. Guernsey's cloud cover percentage also varies seasonally, from 37% in July to 63% in December and January.
The best time to visit Guernsey
The ideal time to visit Guernsey primarily depends on the visitor's preference. However, considering the climate data, it is safe to say that May and June are the best months for a visit. The period from May to June offers a pleasing balance between high temperatures (between 12.8°C (55°F) and 15.2°C (59.4°F)), moderate rainfall, and ample sunshine (9.1 hours per day). The UV Index remains moderately at 4, making it a perfect time for outdoor activities without the danger of excessive sun exposure.The worst time to visit Guernsey
The unfavorable period for visiting Guernsey extends from November to January. High levels of rainfall - 70mm (2.76") to 87mm (3.43"), limited sunshine, and colder temperatures - between 7.8°C (46°F) to 9.2°C (48.6°F), make outdoor activities cumbersome. Furthermore, December witnesses a higher wind gust speed measure at 49.8km/h (30.9mph), contributing to stormy weather that can hamper travel plans.Spring weather in Guernsey
Between March and May, spring brings a gradual rise in temperature from 9.8°C (49.6°F) to 12.8°C (55°F) in Guernsey. Rainfall decreases over the months, providing respite from the winter's heavy downpours. With 11.9 hours of daylight in March and a staggering 15.4 hours in May, springtime promises both longer days and an increase in sunny hours, from 6.2 hours in March to 9.1 hours in May.Summer weather in Guernsey
Summer in Guernsey, extending from June to August, is mild with temperatures averaging between 15.2°C (59.4°F) to 17.8°C (64°F). Conditions counterintuitively become wetter towards the end of summer, with rainfall rising from 33mm (1.3") in June to 41mm (1.61") in August. However, the number of sunshine hours remains steady at 9.1 until July, when it slightly increases to 9.7 hours.Autumn weather in Guernsey
Autumn sees a decline in temperatures, with monthly averages dropping from 15.5°C (59.9°F) in September to 11.1°C (52°F) in November. The rainfall also increases notably during this period, from 31mm (1.22") in September to 87mm (3.43") in November. The number of sunny hours drops, coupled with a decrease in daylight hours, from 12.6 hours in September to 9.1 hours in November.Winter weather in Guernsey
Reflecting true marine climate, Guernsey's winter months from December to February do not experience extreme temperature drops. The averages hover between 7.8°C (46°F) in February and 9.8°C (49.6°F) in December. Winter witnesses the maximum rainfall - 63mm (2.48") to 70mm (2.76") - with January characterized by the highest number of rainy days (22). Despite the shorter days, the phenomenon of "pink winters", with spectacular sunsets, adds a unique allure to Guernsey's winter landscape.Weather in January
The early stages of the year in Guernsey, Guernsey welcome a cloudy and windy atmosphere. Compared to December, January showcases a slight drop in average daily temperatures, but remains the month with the strongest winds, reaching as high as 47.7km/h (29.6mph). Weather in January »Weather in February
In February, Guernsey's weather progresses towards Spring with a slight increase in sunlight hours and slightly less rainfall. While winds reduce in speed, an average visibility of 10km (6.2mi) still allows for clear views across the scenic island landscapes. Weather in February »Weather in March
As the first impression of spring, March in Guernsey brings longer days, more sunlight, and fewer rainfall days, from 17.7 days in February to 17 days in March. The past winter grim gives way to the promising warmth, making March an alluring month for those who appreciate milder climates. Weather in March »Weather in April
April experiences a leap in daylight hours in Guernsey, as it ushers in a beautified spring. Temperatures start to show the incipient signs of Summer with warmer days and less rainfall. Showers are frequent but not prolonged, giving the soil enough time to absorb the water. Weather in April »Weather in May
May designates the arrival of Spring in full swing in Guernsey, with more sun-filled hours and longer days. The average daily temperature elevates from 11°C (51.8°F) to a more comfortable 12.8°C (55°F), bringing about a gradual but noticeable change. Weather in May »Weather in June
June introduces the first caress of summer to Guernsey with temperatures climbing further to a bearable level. This period witnesses the apex of sunshine hours at 16.2 hours per day, offering the most daylight of any month. Moreover, the increased warmth brings an all-around festive spirit to the island's populace. Weather in June »Weather in July
July, the middle of summer, in Guernsey carries the highest average temperatures of the year, peaking at 16.9°C (62.4°F). This month rivals June in terms of daylight hours, marking the height of the local summer season. Despite the continental heat, relative humidity remains relatively stable, making it a pleasant time to visit. Weather in July »Weather in August
August visits Guernsey as the turning point between midsummer and early autumn. Temperatures peak for the year, coasting at 17.8°C (64°F), making it the warmest month on average. The frequency of rainfall picks up, demonstrating its transitional nature. Weather in August »Weather in September
September in Guernsey signifies the slow approach of autumn, with temperatures starting to recede to a mellow 17.2°C (63°F). The weather retains a warm charm and the meandering winds carry an invigorating chill. The gradual change does not hinder outdoor activities, making it a popular month for exploration. Weather in September »Weather in October
October brings about a decisive shift in weather conditions in Guernsey. The average daily temperatures drop to 15.5°C (59.9°F), heralding the onset of cooler days. As the landscape starts to flaunt vivid autumn colours, more hours of daylight are replaced by increased cloud cover. Weather in October »Weather in November
As November unfurls, Guernsey endures a drop in temperature and increasing rainy days, with rainfall reaching its highest level at 87mm (3.43"). The shift towards winter becomes evident with shorter days and less sunshine. Chances of frost at sunrise become increasingly probable towards the end of the month. Weather in November »Weather in December
December ushers in the winter season in Guernsey with temperatures falling to an average low of 9.2°C (48.6°F). Despite the cold, the month rarely sees any snowfall, adding to its uniqueness. As the days grow shorter and darker, preparations for holiday festivities glow brighter. Weather in December »Updated: Feb 9, 2024
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
In Guernsey, Guernsey, during the entire year, the rain falls for 196.3 days and collects up to 557mm (21.93") of precipitation.
January is the only month when snow falls in Guernsey.
January is the month with the most snowfall. Snow falls for 0.3 days and accumulates 2mm (0.08") of snow.
Throughout the year, in Guernsey, there are 0.5 snowfall days, and 2mm (0.08") of snow is accumulated.
The months with the least sunshine in Guernsey, Guernsey, are January, November and December, with an average of 3.9h of sunshine.
February tends to be the coldest month in Guernsey, Guernsey, with temperatures averaging a daily high of 9.2°C (48.6°F) and a low of 7°C (44.6°F).
In Guernsey, snow does not fall in February through December.
With an average maximum UV index of 2, February is the month with the lowest UV index in Guernsey, Guernsey.
June and July, with an average relative humidity of 84%, are most humid months in Guernsey, Guernsey.
The month with the longest days is June, with an average of 16h and 12min of daylight.
July is the month with the least rainfall. Rain falls for 12.8 days and accumulates 26mm (1.02") of precipitation.
July has the most sunshine of the year, with an average of 9.7h of sunshine.
The months with the highest UV index are July through September, with an average maximum UV index of 5.
August is the month when Guernsey experiences its warmest temperatures, averaging a high of 17.8°C (64°F) and a low of 15.8°C (60.4°F).
On Sunday, 27. October 2024, at 02:00, Daylight Saving Time ends in Guernsey, Guernsey, and the time zone changes from BST to GMT. The next Daylight Saving Time starts on Sunday, 30. March 2025, at 01:00, and the time zone reverts from GMT to BST.
The months with the lowest humidity in Guernsey are November and December, with an average relative humidity of 77%.
The month with the most rainfall is November, when the rain falls for 22.8 days and typically aggregates up to 87mm (3.43") of precipitation.
December has the shortest days of the year in Guernsey, with an average of 8h and 12min of daylight.
Average temperature
Guernsey, Guernsey
The warmest month (with the highest average high temperature) is August (17.8°C).
The month with the lowest average high temperature is February (9.2°C).
The month with the highest average low temperature is August (15.8°C).
The coldest month (with the lowest average low temperature) is February (7°C).
Average pressure
Guernsey, Guernsey
- Average pressure in January:
1016.1mbar - Average pressure in February:
1015.2mbar - Average pressure in March:
1016.2mbar - Average pressure in April:
1015.6mbar - Average pressure in May:
1017.4mbar - Average pressure in June:
1016.9mbar
- Average pressure in July:
1016.7mbar - Average pressure in August:
1016.4mbar - Average pressure in September:
1017.9mbar - Average pressure in October:
1015.7mbar - Average pressure in November:
1011.5mbar - Average pressure in December:
1016.5mbar
The month with the highest atmospheric pressure is September (1017.9mbar).
The month with the lowest atmospheric pressure is November (1011.5mbar).
Average wind speed
Guernsey, Guernsey
- Average wind speed in January:
34.1km/h - Average wind speed in February:
34km/h - Average wind speed in March:
30.3km/h - Average wind speed in April:
25km/h - Average wind speed in May:
23.7km/h - Average wind speed in June:
22.8km/h
- Average wind speed in July:
21.9km/h - Average wind speed in August:
22.8km/h - Average wind speed in September:
25.8km/h - Average wind speed in October:
29.1km/h - Average wind speed in November:
34.8km/h - Average wind speed in December:
36km/h
The windiest month (with the highest average wind speed) is December (36km/h).
The calmest month (with the lowest average wind speed) is July (21.9km/h).
Average humidity
Guernsey, Guernsey
The months with the highest relative humidity are June and July (84%).
The months with the lowest relative humidity are November and December (77%).
Average rainfall
Guernsey, Guernsey
The wettest month (with the highest rainfall) is November (87mm).
The driest month (with the least rainfall) is July (26mm).
Average rainfall days
Guernsey, Guernsey
- Average rainfall days in January:
22 days - Average rainfall days in February:
17.7 days - Average rainfall days in March:
17 days - Average rainfall days in April:
13.3 days - Average rainfall days in May:
11.8 days - Average rainfall days in June:
11.5 days
- Average rainfall days in July:
12.8 days - Average rainfall days in August:
14 days - Average rainfall days in September:
13.5 days - Average rainfall days in October:
18.5 days - Average rainfall days in November:
22.8 days - Average rainfall days in December:
21.4 days
The month with the highest number of rainy days is November (22.8 days).
The month with the least rainy days is June (11.5 days).
Average snowfall
Guernsey, Guernsey
The month with the highest snowfall is January (2mm).
The months with the least snowfall are February, March, April, May, June, July, August, September, October, November and December (0mm).
Average snowfall days
Guernsey, Guernsey
- Average snowfall days in January:
0.3 days - Average snowfall days in February:
0.2 days - Average snowfall days in March:
0 days - Average snowfall days in April:
0 days - Average snowfall days in May:
0 days - Average snowfall days in June:
0 days
- Average snowfall days in July:
0 days - Average snowfall days in August:
0 days - Average snowfall days in September:
0 days - Average snowfall days in October:
0 days - Average snowfall days in November:
0 days - Average snowfall days in December:
0 days
The month with the highest number of snowfall days is January (0.3 days).
The months with the least snowfall days are March, April, May, June, July, August, September, October, November and December (0 days).
Average daylight / Average sunshine
Guernsey, Guernsey
- Average daylight in January:
8h and 42min - Average daylight in February:
10h and 6min - Average daylight in March:
11h and 54min - Average daylight in April:
13h and 48min - Average daylight in May:
15h and 24min - Average daylight in June:
16h and 12min
- Average daylight in July:
15h and 48min - Average daylight in August:
14h and 24min - Average daylight in September:
12h and 36min - Average daylight in October:
10h and 48min - Average daylight in November:
9h and 6min - Average daylight in December:
8h and 12min
The month with the longest days is June (Average daylight: 16h and 12min).
The month with the shortest days is December (Average daylight: 8h and 12min).
- Average sunshine in January:
3h and 54min - Average sunshine in February:
4h and 0min - Average sunshine in March:
6h and 12min - Average sunshine in April:
9h and 6min - Average sunshine in May:
9h and 6min - Average sunshine in June:
9h and 6min
- Average sunshine in July:
9h and 42min - Average sunshine in August:
9h and 12min - Average sunshine in September:
8h and 24min - Average sunshine in October:
4h and 54min - Average sunshine in November:
3h and 54min - Average sunshine in December:
3h and 54min
The month with the most sunshine is July (Average sunshine: 9h and 42min).
The months with the least sunshine are January, November and December (Average sunshine: 3h and 54min).
Average sunshine days
Guernsey, Guernsey
- Average sunshine days in January:
5.5 days - Average sunshine days in February:
6.9 days - Average sunshine days in March:
10.7 days - Average sunshine days in April:
14.8 days - Average sunshine days in May:
16.3 days - Average sunshine days in June:
16 days
- Average sunshine days in July:
15.4 days - Average sunshine days in August:
12.1 days - Average sunshine days in September:
13.1 days - Average sunshine days in October:
8.6 days - Average sunshine days in November:
4 days - Average sunshine days in December:
5.3 days
The month with the most sunshine days is May (16.3 days).
The month with the least sunshine days is November (4 days).
Average UV index
Guernsey, Guernsey
The months with the highest UV index are July, August and September (UV index 5).
The month with the lowest UV index is February (UV index 2).
Average cloud cover
Guernsey, Guernsey
The months with the most cloud cover are November and December (Cloud cover 63).
The month with the least cloud cover is July (Cloud cover 37).
Average visibility
Guernsey, Guernsey
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).
