Climate and monthly weather forecastFort George, Guernsey
Climate and monthly weather forecast
The climate of Fort George
Nestled on the distinctive island of Guernsey, Fort George endures a Marine west coast climate, under the Köppen climate classification known as Cfb. Also referred to as a warm summer climate, it predominantly features moderate temperatures and regular rainfall throughout the year.From January through December, Fort George experiences average high temperatures ranging from 9.2°C (48.6°F) in February to a peak of 17.8°C (64°F) in the month of August. The mean low temperatures on the other hand, fluctuate from 7°C (44.6°F) in February to 15.8°C (60.4°F) in August. When it comes to humidity, the relative humidity levels throughout the year hover around 78% in January and February, reaching up to 84% from June through August as the atmosphere fills up with moist, warm air.
Gradient rainfall is experienced in Fort George, with the highest precipitation seen in November with a substantial 87mm (3.43"), while the rest of the months range from a minimum of 26mm (1.02") in July up to 70mm (2.76") in December. Concurrently, the number of rainfall days parallels this pattern, with November presenting a highshifting reach of 22.8 days and the rest of the year hovering between 11.5 days in June to 22 days in January.
The prevailing winds maintain a solid pace throughout the year, averaging between 21.9km/h (13.6mph) in July up to an increased velocity of 36km/h (22.4mph) in December. Worth mentioning is the visibility which remains consistent at 10km (6.2mi) all year round, providing clear, unhindered views.
The best time to visit Fort George
The optimum period to plan a visit to Fort George depends largely on personal preferences. However, considering a balance between weather conditions and daylight hours, the best time tends to be between June and August. During this period, temperatures stay comfortably between 15.2°C (59.4°F) to 17.8°C (64°F), paired with favourable conditions such as lower rainfall days and less precipitation. Furthermore, June presents the longest daylight hours of 16.2 and adequate sunshine lasting up to 9.1 hours.The worst time to visit Fort George
Planning a journey to Fort George might be less desirable during the months of November and December. As the year winds down, these months encounter the highest levels of rainfall measuring up to 87mm (3.43"), and increased rainy days reaching up to 22.8 days in November. Furthermore, the temperatures also dip down to 13°C (55.4°F), and daylight hours decrease, which can influence outdoor activities.Spring weather in Fort George
Spring in Fort George extends from March through May. The weather during this season is typified by gradual temperature increases from 9.8°C (49.6°F) in March to 12.8°C (55°F) in May. The low temperatures also warm up across these months from 7.4°C (45.3°F) to 10.6°C (51.1°F). Concurrently, rainfall decreases relatively from 38mm (1.5") in March to 27mm (1.06") by May and the number of rainy days reduces as well, giving way to more sunshine hours especially in May with 9.1 hours.Summer weather in Fort George
The summer months between June and August in Fort George bring about warmer than average temperatures, with highs venturing from 15.2°C (59.4°F) to 17.8°C (64°F) and lows remaining between 13.2°C (55.8°F) to 15.8°C (60.4°F). Despite being the warmest period of the year, rainfall remains relatively low with an average of 33mm (1.3") in June and only 26mm (1.02") in July. Sunshine hours also peak during this period, offering ample opportunity for outdoor activities.Autumn weather in Fort George
During the autumn months of September through November, Fort George witnesses a drop in temperatures from 17.2°C (63°F) in September down to 13°C (55.4°F) in November. Rainfall increases notably during this period, peaking at a high of 87mm (3.43") in November. Despite this, the amount of sunshine hours remains decent at around 8.4 hours in September, slowly diminishing to 3.9 hours by November.Winter weather in Fort George
Winter sets in Fort George from December through February, marked by lower temperatures. Highs range from 9.8°C (49.6°F) in December down to 9.2°C (48.6°F) in February, while lows stay between 9.2°C (48.6°F) and 7°C (44.6°F) respectively. Rainfall remains fairly consistent, hovering around 70mm (2.76") in December and dropping to 51mm (2.01") in February. Despite the chilly weather, December offers up to 8.3 hours of daylight, reducing to 8.7 hours by February.Weather in January
January in Fort George, Guernsey presents a typical winter month. Despite the widespread belief of cold weather during this season, the temperature is not extremely low but rather mild. The mornings and evenings see small fluctuations, circling around the average levels. Weather in January »Weather in February
February is characterized by minor changes in the temperature band compared with January. There is a slight increase in daylight hours, allowing the denizens to enjoy more of the outdoors. As a month known for sporadic rain showers, rainfall occurs with moderate frequency, but snowfall remains an uncommon appearance. Weather in February »Weather in March
March demonstrates the advent of spring in Fort George, Guernsey, with overall warmer temperatures compared to February. The rainfall becomes more moderate, and there's also a noticeable increase in sunlight hours, indicative of the transition from winter to spring. Weather in March »Weather in April
April signifies the heart of spring in Fort George, Guernsey, with more gentle weather patterns. Noticeably, the average wind speed drops to 25km/h (15.5mph) from 30.3km/h (18.8mph) in March, confirming the gentleness of the wind compared to earlier months. Weather in April »Weather in May
May bears the final touch of spring in Fort George, Guernsey, while also setting the stage for the approaching summer. The days are sunnier, with extended daylight hours and slight enhancements in temperature levels. Rainfall becomes even less frequent than April, indicating dryer conditions. Weather in May »Weather in June
June commands the start of summer in Fort George, Guernsey, with warmer temperatures and longer sunlight hours. The wind speed further declines, contributing to a calm and serene atmosphere. The relative humidity level ascends slightly from the previous month, but not drastically. Weather in June »Weather in July
July is a full-blown summer month in Fort George, Guernsey. Interestingly, the UV Index soars to its peak value of 5, urging residents and visitors to use sun protection. The temperatures, both high and low, remain comfortable for roaming around and soaking in the beauty of the locale. Weather in July »Weather in August
August in Fort George, Guernsey is synonymous with high summer temperatures. However, this month also notes the first signs of the impending autumn, displaying a minor dip in temperature from July. The UV index maintains its high summer value, prompting the need for sun protection measures. Weather in August »Weather in September
September spells the onset of autumn in Fort George, Guernsey, with temperatures slowly starting to cool down. The month records an average wind speed of 25.8km/h (16mph), up from the 22.8km/h (14.2mph) noted in August which is indicative of changing seasons. Weather in September »Weather in October
October ushers in a more noticeable autumn feel in Fort George, Guernsey. The temperatures drop slightly compared to September, and the daylight hours also decrease significantly. Rainfall begins to demonstrate an upward trend as the winter season draws nearer. Weather in October »Weather in November
November in Fort George, Guernsey signals the transition from autumn to the outset of winter. Notably, rainfall reaches the peak for the entire year, registering a high of 87mm (3.43"). The temperatures continue to descend on both, the higher and lower ends of the spectrum. Weather in November »Weather in December
December marks the full onset of winter in Fort George, Guernsey. The temperatures fall to one of the lowest of the year and are reminiscent of January levels. The rainfall amount slightly recedes from November, but the frequency of rain days remains high. 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
Throughout the year, in Fort George, there are 196.3 rainfall days, and 557mm (21.93") of precipitation is accumulated.
January is the only month when snow falls in Fort George.
The month with the most snowfall in Fort George is January, when snow falls for 0.3 days and typically aggregates up to 2mm (0.08") of snow.
In Fort George, Guernsey, during the entire year, snow falls for 0.5 days and aggregates up to 2mm (0.08") of snow.
January, November and December, with an average of 3.9h of sunshine, are months with the least sunshine in Fort George.
February is the month when Fort George sees the average lowest temperatures, with a high of 9.2°C (48.6°F) and a low of 7°C (44.6°F).
In Fort George, snow does not fall in February through December.
February is the month with the lowest UV index in Fort George, with an average maximum UV index of 2.
June and July, with an average relative humidity of 84%, are most humid months.
The month with the longest days is June, with an average of 16h and 12min of daylight.
The month with the least rainfall in Fort George is July, when the rain falls for 12.8 days and typically collects 26mm (1.02") of precipitation.
The month with the most sunshine is July, with an average of 9.7h of sunshine.
The months with the highest UV index in Fort George are July through September, with an average maximum UV index of 5.
August stands out as Fort George's warmest month, with temperatures ranging between an average 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 Fort George, 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 Fort George, Guernsey, are November and December, with an average relative humidity of 77%.
The month with the most rainfall in Fort George 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, with an average of 8h and 12min of daylight.
Average temperature
Fort George, 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
Fort George, 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
Fort George, 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
Fort George, 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
Fort George, Guernsey
The wettest month (with the highest rainfall) is November (87mm).
The driest month (with the least rainfall) is July (26mm).
Average rainfall days
Fort George, 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
Fort George, 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
Fort George, 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
Fort George, Guernsey
- Average daylight in January:
8h and 42min - Average daylight in February:
10h and 12min - 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
Fort George, 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
Fort George, 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
Fort George, 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
Fort George, 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).
