Climate and monthly weather forecast
Grandes Capelles, Guernsey

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The climate of Grandes Capelles

Based on the Köppen climate classification, the capital of Guernsey, Grandes Capelles, is categorized as having a marine west coast climate, with warm summers. Geographically located in the English Channel, the weather in Grandes Capelles exhibits characteristics of Northern latitude climates.

An intriguing subtlety of Grandes Capelles climate is the rather limited temperature fluctuations. With the average high temperature plateauing from 9.2°C (48.6°F) to 17.8°C (64°F) and the lowest temperatures showing a similar trend with averages ranging from 7°C (44.6°F) to 15.3°C (59.5°F), the mildness of this marine climate becomes apparent. Humidity stands relatively high throughout the year, peaking at 84% during the summer months and dropping slightly to 77% during winter.

The town's precipitation tendencies bring an element of predictability, with rainfall ranging from 26mm (1.02") in July to a high of 87mm (3.43") in November. Despite the island body's position in the Channel, snowfall in Grandes Capelles is a rare occurrence; it remains close to none throughout the year. The southwestern winds of the Atlantic maintain a steady pace throughout the year, escalating slightly during winter months with speeds from 21.9km/h (13.6mph) to 36km/h (22.4mph).

The best time to visit Grandes Capelles

Factoring in parameters such as temperature, precipitation, daylight, and sunshine hours, the most opportune time for a visit to Grandes Capelles might be between June and August. This period presents the peak of pleasant weather conditions. Summer days in Grandes Capelles are typically warm with high temperatures averaging between 15.2°C (59.4°F) to 17.8°C (64°F), providing a comfortable atmosphere for outdoor activities. The rainfall is also at its minimum during these months, averaging from 26mm (1.02") to 33mm (1.3").

The worst time to visit Grandes Capelles

Oppositely, planning a visit during late autumn to early winter, specifically between November and January, might prove to be less hospitable. The period is characterized by the year's lowest daylight hours, 9.1 hours to 8.3 hours, and highest rainfalls, with 87mm (3.43") in November and 70mm (2.76") in December. Moreso, it can be chilly with the average high temperature a mere 11.1°C (52°F) to 9.8°C (49.6°F), and the average low temperature hovering between 9.2°C (48.6°F) to 7.8°C (46°F).

Spring weather in Grandes Capelles

Spring in Grandes Capelles is mild and becoming. From March to May, daily highs steadily increase from 9.8°C (49.6°F) in March to 12.8°C (55°F) in May. Rainfall lessens gradually over these months from 38mm (1.5") in March to 27mm (1.06") in May, allowing longer daylight hours from 11.9 hours to 15.4 hours and sunshine duration

Summer weather in Grandes Capelles

Summertime, from June through August, often presents the best of weather conditions. High temperatures average from 15.2°C (59.4°F) up to 17.8°C (64°F) in August. Rainfalls are fleeting with the averages 26mm (1.02") to 33mm (1.3"), making room for longer daylight hours from 16.2 hours to 15.8 hours, and lengthened sunshine hours up to 9.7 hours in July.

Autumn weather in Grandes Capelles

Autumn, marked by September through November, initially experiences a continuation of summer's warmth, but temperatures gradually descend. The highs range from 17.2°C (63°F) in September to 13°C (55.4°F) in November, and rainfall begins to mount up from 31mm (1.22") in September to a peak of 87mm (3.43") in November.

Winter weather in Grandes Capelles

Winter in Grandes Capelles, running December through February, is relatively mild in comparison to continental Europe. Temperatures oscillate from lows of 9.2°C (48.6°F) up to highs of 9.8°C (49.6°F). Rainfall hovers around high levels, with 70mm (2.76") in December dropping to 63mm (2.48") in February, while daylight becomes scarce with an average of just 8.3 hours.

Weather in January

Grandes Capelles, Guernsey, kicks off the year with weather that leans towards the chilly side. January sees average temperatures lingering from 7.8°C (46°F) to 9.8°C (49.6°F) and it can be a bit damp with relatively high humidity. Weather in January »

Weather in February

February is a mirror image of January in Grandes Capelles with its cool temperatures and often cloudy skies. Temperatures slightly drop, reaching lows of 7°C (44.6°F) and highs of 9.2°C (48.6°F). Rainfall lessens in comparison to the preceding month, making outings slightly more pleasant. Weather in February »

Weather in March

The transition from winter to spring in the month of March manifests itself subtly in Grandes Capelles weather. A modest increase in the average temperature is observed, rising to between 7.4°C (45.3°F) and 9.8°C (49.6°F). The duration of daylight extends, thus enabling more daylight hours for exploration and activity. Weather in March »

Weather in April

April in Grandes Capelles ushers in a noticeable warming trend with average highs reaching 11°C (51.8°F). This period marks a steady progression in terms of both temperatures and daylight hours. The weather during this month is characterized by the increase in sunshine hours and decrease in rainfall days to 13.3. Weather in April »

Weather in May

In Grandes Capelles, May is the month where Spring is in full bloom. Accentuated by a comforting temperature range from 10.6°C (51.1°F) to 12.8°C (55°F), the climatic conditions are prime for outdoor activities. The city experiences a further decrease in rainfall, aiding in the growth of lush greenery. Weather in May »

Weather in June

June welcomes the onset of summer in Grandes Capelles. The mercury climbs a little higher, averaging between 13.2°C (55.8°F) and 15.2°C (59.4°F). This is also the month with the most amount of daylight hours, 16.2 hours on average. Weather in June »

Weather in July

This is the month when temperatures peak in Grandes Capelles. July is the warmest month, with temperatures rising from 15.3°C (59.5°F) to 16.9°C (62.4°F) on average. Long sunny days coupled with the warm climate attract tourists and locals alike to the outdoors. Weather in July »

Weather in August

August in Grandes Capelles sees a continuation of warm summer weather. It is the month with the highest low temperature, averaging at 15.8°C (60.4°F). The relief of cool winds is optimum as it ensures a balance between warmth and comfort. Weather in August »

Weather in September

September ushers in the autumn season in Grandes Capelles. The balmy summer temperatures begin to subside, setting the stage for cooler autumn nights. On average, temperatures range from 15.4°C (59.7°F) to 17.2°C (63°F). The city witnesses an increase in rainy days but holds on to a fair share of sunshine. Weather in September »

Weather in October

In Grandes Capelles, October is characterized by few bouts of rainfall and reduced sunshine hours. Average temperatures fluctuate between 13.6°C (56.5°F) and 15.5°C (59.9°F), maintaining a mild climate. Sunshine intervals keep the days pleasantly warm despite the seasonal transition. Weather in October »

Weather in November

November sees a steep decline in temperatures in Grandes Capelles, dropping to between 10.9°C (51.6°F) and 13°C (55.4°F). The city experiences shorter days and less sunshine hours, a stark contrast to the vibrant summer months. Weather in November »

Weather in December

December rounds off the year in Grandes Capelles with overall temperatures dropping from 9.2°C (48.6°F) to 11.1°C (52°F). Moving towards the end of the year, the city experiences maximum rainfall, 70mm (2.76") on average. Despite these conditions, the city is decorated in festive cheer, which offers a silver lining even in dreary weather. Weather in December »

Frequently asked questions

How much does it rain in Grandes Capelles?

Throughout the year, in Grandes Capelles, Guernsey, there are 196.3 rainfall days, and 557mm (21.93") of precipitation is accumulated.

When does it snow in Grandes Capelles?

The only month with snowfall in Grandes Capelles is January.

What is the snowiest month in Grandes Capelles?

The month with the most snowfall in Grandes Capelles, Guernsey, is January, when snow falls for 0.3 days and typically aggregates up to 2mm (0.08") of snow.

How many days does it snow in Grandes Capelles?

In Grandes Capelles, Guernsey, during the entire year, snow falls for 0.5 days and aggregates up to 2mm (0.08") of snow.

What are the months with the least sunshine in Grandes Capelles?

The months with the least sunshine are January, November and December, with an average of 3.9h of sunshine.

What part of the year is the coldest in Grandes Capelles?

February, recording an average high temperature of 9.2°C (48.6°F) and a low temperature of 7°C (44.6°F), is Grandes Capelles's coldest month.

When it does not snow in Grandes Capelles?

In Grandes Capelles, snow does not fall in February through December.

When is the lowest UV index in Grandes Capelles?

February is the month with the lowest UV index, with an average maximum UV index of 2.

What is the most humid month in Grandes Capelles?

The months with the highest humidity in Grandes Capelles are June and July, with an average relative humidity of 84%.

When are the longest days in Grandes Capelles?

The month with the longest days is June, with an average of 16h and 12min of daylight.

What is the driest month in Grandes Capelles?

July is the month with the least rainfall. Rain falls for 12.8 days and accumulates 26mm (1.02") of precipitation.

What month has the most sunshine in Grandes Capelles?

With an average of 9.7h of sunshine, July has the most sunshine of the year.

When is the highest UV index in Grandes Capelles?

July through September, with an average maximum UV index of 5, are months with the highest UV index in Grandes Capelles, Guernsey.

What month is the hottest in Grandes Capelles?

Grandes Capelles, Guernsey, records the warmest temperatures in August, averaging a high of 17.8°C (64°F) and a low of 15.8°C (60.4°F).

When is Daylight Saving Time (DST) in Grandes Capelles?

On Sunday, 27. October 2024, at 02:00, Daylight Saving Time ends in Grandes Capelles, 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.

What is the least humid month in Grandes Capelles?

The months with the lowest humidity in Grandes Capelles, Guernsey, are November and December, with an average relative humidity of 77%.

What is the wettest month in Grandes Capelles?

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.

What is the month with the shortest days in Grandes Capelles?

December has the shortest days of the year in Grandes Capelles, with an average of 8h and 12min of daylight.

Average temperature
Grandes Capelles, Guernsey

Average temperature - Grandes Capelles, 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
Grandes Capelles, Guernsey

Average pressure - Grandes Capelles, Guernsey

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
Grandes Capelles, Guernsey

Average wind speed - Grandes Capelles, Guernsey

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
Grandes Capelles, Guernsey

Average humidity - Grandes Capelles, 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
Grandes Capelles, Guernsey

Average rainfall - Grandes Capelles, Guernsey

The wettest month (with the highest rainfall) is November (87mm).
The driest month (with the least rainfall) is July (26mm).

Average rainfall days
Grandes Capelles, Guernsey

Average rainfall days - Grandes Capelles, Guernsey

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
Grandes Capelles, Guernsey

Average snowfall - Grandes Capelles, 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
Grandes Capelles, Guernsey

Average snowfall days - Grandes Capelles, Guernsey

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
Grandes Capelles, Guernsey

Average daylight / Average sunshine - Grandes Capelles, Guernsey

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).

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
Grandes Capelles, Guernsey

Average sunshine days - Grandes Capelles, Guernsey

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
Grandes Capelles, Guernsey

Average UV index - Grandes Capelles, 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
Grandes Capelles, Guernsey

Average cloud cover - Grandes Capelles, 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
Grandes Capelles, Guernsey

Average visibility - Grandes Capelles, 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).

Grandes Capelles, Guernsey

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