Climate and monthly weather forecast
Guernsey

Guernsey, located in the English Channel off the coast of Normandy, is the second-largest of the Channel Islands. Its geographical location allows it to be influenced heavily by the oceanic climate. Guernsey's climate, classified as Cfb by the Köppen climate classification, involves mild temperatures throughout the year with no extreme weather conditions. The average temperature ranges from 6°C (42.8°F) in the colder months to 20°C (68°F) in the warmer months, with rainfall distributed fairly evenly across the year. As a result, the weather is generally comfortable, rarely reaching extremes of heat or cold, and can be characterized by a pleasant combination of mild winters and warm summers.

The best time to visit Guernsey is generally during the summer months, from June to August, when the weather is warmest. Temperatures during this period typically average around 19°C (66.2°F) to 20°C (68°F). This period sees longer daylight hours, allowing visitors to take full advantage of outdoor activities such as exploring the island's beautiful beaches, historic sites, and nature reserves. However, it is advisable to carry light rain gear as occasional showers can occur, even during the summer.

The period from December to February can be considered the least attractive for tourists, mainly due to lower temperatures and shorter daylight hours. Average temperatures during these months fluctuate around 6°C (42.8°F), although they seldom fall below freezing. Additionally, this period can be wetter with an average precipitation of approximately 60mm (2.36") per month. However, the island still maintains its charm with its winter landscapes and less crowded tourist spots.

Spring in Guernsey, from March to May, showcases a gradual warming trend with temperatures ranging from 9°C (48.2°F) to 15°C (59°F). This period witnesses the island spring into bloom, adding to its natural beauty. Rainfall is moderate, averaging about 40mm (1.57") to 50mm (1.97") per month. The weather is generally mild, allowing for pleasant outdoor activities, including visiting the lush green parks and gardens.

Summer, which spans June to August, offers the warmest weather in Guernsey. Temperatures average from 17°C (62.6°F) to 20°C (68°F), making it a perfect time for beach activities and water sports. However, summer is not devoid of rainfall, with each month receiving between 30mm (1.18") and 40mm (1.57") of precipitation. Despite this, the summer season is predominantly sunny, making it the most popular time for tourists.

Autumn in Guernsey, from September to November, involves a gradual decrease in temperature from around 17°C (62.6°F) at the start of the season to about 11°C (51.8°F) by its end. This period sees an increase in rainfall, with November being one of the wettest months averaging nearly 60mm (2.36"). Nevertheless, the blend of mild temperatures and scenic autumn foliage offers a picturesque landscape, ideal for nature enthusiasts.

Winter in Guernsey lasts from December to February, with the coldest month being February. During this period, temperatures average from 6°C (42.8°F) to 8°C (46.4°F). While snow is rare, winter sees the highest rainfall with each month averaging between 60mm (2.36") and 70mm (2.76") of precipitation. Despite the relatively cool and damp conditions, the winter season can offer serene landscapes and peaceful walks along the island's scenic routes.

January in Guernsey stands as one of the coldest months of the year, with average temperatures hovering around 6°C (42.8°F). During this month, the weather is typically mild and damp, though considerably milder than many other northern European regions due to the moderating influence of the surrounding sea. Weather in January »

February typically represents the pinnacle of winter in Guernsey, generally marking the coldest month of the year. Average temperatures during February remain around 6°C (42.8°F), similar to January, with occasional lows dipping slightly further, albeit rarely falling below freezing due to the island's maritime influence. In terms of precipitation, February continues the trend of high rainfall seen in January. Weather in February »

March signals the arrival of spring in Guernsey. During this month, the island begins to witness a slight increase in temperatures compared to the winter months. Average temperatures range from 7°C (44.6°F) to 9°C (48.2°F), hinting at the warmer days ahead. Weather in March »

April in Guernsey brings more noticeable signs of spring. Average temperatures begin to climb, ranging from 9°C (48.2°F) to 12°C (53.6°F), providing milder and more enjoyable weather for outdoor activities. The moderation of the sea's influence, combined with longer daylight hours, contributes to a generally pleasant climate. In terms of precipitation, April continues the trend of decreased rainfall observed in March. Weather in April »

May in Guernsey signifies the height of spring and the transition into the early stages of summer. Average temperatures during May range from 12°C (53.6°F) to 15°C (59°F), making the month notably warmer than April. These milder conditions, complemented by longer daylight hours, contribute to a generally pleasant and enjoyable climate. In terms of precipitation, May experiences moderate rainfall levels, averaging 40mm (1.57") over approximately 10 to 12 days. Weather in May »

June marks the commencement of summer in Guernsey. This month witnesses a significant increase in temperatures, which range from 15°C (59°F) to 18°C (64.4°F), providing an ideal climate for beach visits and other outdoor activities. Weather in June »

July in Guernsey represents the peak of the summer season, with the warmest temperatures of the year. Average temperatures typically range from 17°C (62.6°F) to 20°C (68°F), creating the perfect setting for swimming, sunbathing, and enjoying various water sports. As it pertains to rainfall, July experiences a similar level of precipitation as June, with the island receiving around 30mm (1.18") to 35mm (1.38") spread across approximately 8 to 10 days. Weather in July »

August in Guernsey extends the summer warmth, with temperatures comparable to those experienced in July. Average temperatures continue to range from 17°C (62.6°F) to 20°C (68°F), maintaining the pleasant conditions for outdoor activities and beach visits. When it comes to rainfall, August sees a slight increase compared to the previous summer months. Weather in August »

September in Guernsey signals the onset of the autumn season. During this month, the island starts to experience a gradual decline in temperatures, which typically range from 15°C (59°F) to 17°C (62.6°F). Despite this decrease, the weather remains relatively mild and enjoyable for outdoor activities. Regarding precipitation, September sees an increase compared to the summer months. Weather in September »

October in Guernsey is a clear reflection of the progressing autumn season. Average temperatures drop further compared to September, typically ranging from 12°C (53.6°F) to 14°C (57.2°F). Although the weather becomes cooler, the moderating influence of the surrounding sea ensures a continued mild climate. When it comes to precipitation, October marks a peak in rainfall for the latter half of the year. Weather in October »

November in Guernsey continues the trend of declining temperatures indicative of the late autumn season. The average temperatures during this month range from 9°C (48.2°F) to 11°C (51.8°F), significantly cooler compared to October. Weather in November »

December in Guernsey marks the onset of the winter season, with some of the coldest temperatures of the year. Average temperatures during this month range from 7°C (44.6°F) to 9°C (48.2°F). The influence of the surrounding sea helps to temper the cold, ensuring that temperatures rarely fall below freezing. When it comes to precipitation, December experiences high rainfall, akin to November. Weather in December »