Climate and monthly weather forecastSaint Sampson, Guernsey
Climate and monthly weather forecast
The climate of Saint Sampson
A marine west coast climate or warm summer under a Köppen climate classification prevails in Saint Sampson, Guernsey. The temperate climate makes it comfortable throughout the year, with temperatures rising from 7°C (44.6°F) in February to a peak of 17.8°C (64°F) in August. Variations in temperature exist across the year, and a marked difference exists in temperatures from winter to summer seasons.Rainfall occurs throughout the year with the heaviest descending in November at 87mm (3.43") and the lightest in July at 26mm (1.02"). The number of rainy days per year fluctuates, peaking in November and December with over 22 days of precipitation, while the drier times fall from May to July with less than 13 days of rainfall.
Observations note a consistency in visibility, maintaining an average of 10km (6.2mi) throughout the year. Wind speeds surge from 21.9km/h (13.6mph) in July to a maximum of 36km/h (22.4mph) in December, with gusts reaching an impressive 49.8km/h (30.9mph) in December. The prominence of relative humidity manifests more during summer with a peak at 84% in June and July, slightly dropping to 77% in December and January.
The best time to visit Saint Sampson
The optimal time to visit Saint Sampson is between May and September when, compared to rest of the year, the island experiences mild temperatures between 12.8°C (55°F) and 17.8°C (64°F). Sunshine is abundant during these months, especially from June to August when the island sees about 9.1 to 9.7 hours of daily sunshine. Rainfall is at its lowest, and the relative humidity is manageable despite reaching a peak of 84%. Clear skies dominate during the summer months with cloud coverage dropping to 37% in July.The worst time to visit Saint Sampson
The less favorable months to tour Saint Sampson fall within the colder, wetter period of November to January. During this window, temperatures drop to lows of around 9°C (48.2°F) and rainfall levels rise to the highest peaks of the year. Moreover, daylight hours dip to their lowest point, with merely about 8 to 9 hours daily, sharply contrasting with the long summer days.Spring weather in Saint Sampson
Spring brings milder temperatures to Saint Sampson from March to May, ranging from 9.8°C (49.6°F) to 12.8°C (55°F). Though rainfall isn't a particular concern during this season, relative humidity begins to climb from 80% in March to 82% in May. Visitors can enjoy increasing daylight hours, from 11.9 hours in March to a comfortable 15.4 hours in May.Summer weather in Saint Sampson
The summer months of June through August in Saint Sampson offer an inviting climate with temperatures varying between 15.2°C (59.4°F) and 17.8°C (64°F). Rainfall is significantly reduced during this period, and combined with an average of 9.1 to 9.7 hours of daily sunshine, this is a prime time for outdoor activities. Despite the humidity peaking, the moderate temperatures keep it comfortable.Autumn weather in Saint Sampson
Autumn settles into Saint Sampson from September to November with a noticeable decrease in temperature from 17.2°C (63°F) to 13°C (55.4°F). Rainfall begins a steady climb in this period, peaking to the highest in November at 87mm (3.43"). Daylight hours taper down, but the season still offers a respectable 9.1 to 12.6 daylight hours daily.Winter weather in Saint Sampson
Winter in Saint Sampson, from December to February, records the coldest temperatures of the year, ranging from 9.2°C (48.6°F) to 11.1°C (52°F). Rainfall remains fairly constant around 70mm (2.76"), and days shorten significantly with daylight hours hovering between 8.3 and 10.2 hours. The chill in the air amplifies with wind speeds escalating to more than 34km/h (21.1mph) in December and January.Weather in January
The year opens with a cool month in Saint Sampson, Guernsey. January is characterized by moderate rainfall, coupled with occasional snowfall, a property unique compared to subsequent months. The temperature fluctuates from 7.8°C (46°F) as the lowest to a peak of 9.8°C (49.6°F). Weather in January »Weather in February
In February, the city experiences a slight decrease in temperature, humidity, and rainfall compared to January. The cool trend persists, with snowfall almost flushing out completely. The lowest temperature plummets to 7°C (44.6°F) while the highest temperature slightly drops to 9.2°C (48.6°F). Weather in February »Weather in March
Things start to warm up a notch in Saint Sampson as spring breaks in March. This month is marked by the cessation of any remaining snowfall altogether, and a noticeable increase in overall sunlight. Temperatures range from a low of 7.4°C (45.3°F) to a high of 9.8°C (49.6°F). Weather in March »Weather in April
April denotes a significant turn in the city's climatological picture, with the conditions turning warmer and drier. Rainfall reduces further to a monthly total of 32mm (1.26"), presenting a marked difference from the previous month. Weather in April »Weather in May
As May sets in, Saint Sampson transitions fully into spring, with a further uptick in temperatures. The city experiences no snowfall, increased daylight hours, and modest peaks of sunshine of around 15.4 hours. An increase in temperature can be felt with the mercury chart showing levels from a low of 10.6°C (51.1°F) to a high of 12.8°C (55°F). Weather in May »Weather in June
June comes with the onset of summer in Saint Sampson, bringing along warmer days. This month experiences the highest amount of daylight at 16.2 hours, denoting the longest days of the year. The temperatures rise to a range between 13.2°C (55.8°F) and 15.2°C (59.4°F), which is a notable increase from the previous month. Weather in June »Weather in July
July forms the height of summer in Saint Sampson, marked by hot days and relatively high humidity levels. The temperatures rise further and vary from 15.3°C (59.5°F) to a warm 16.9°C (62.4°F), scoring July as the hottest month of the year. Weather in July »Weather in August
August signifies the waning of summer in Saint Sampson, with temperatures slightly dipping towards the end of the month. Despite this, it remains largely warm, with temperatures ranging between 15.8°C (60.4°F) to 17.8°C (64°F). Weather in August »Weather in September
The arrival of September heralds the commencement of autumn in Saint Sampson. The climate cools slightly from the summer's peak temperature, with the range set between 15.4°C (59.7°F) and 17.2°C (63°F). There's a slight increase in rainfall from August, recording a total of 31mm (1.22") precipitation. Weather in September »Weather in October
October in Saint Sampson marks a further evolutionary stage in autumn, complete with a palpable fall in temperatures. The mercury shows readings that oscillate between 13.6°C (56.5°F) and 15.5°C (59.9°F), a fall that draws a significant departure from the heat of the summer months. Weather in October »Weather in November
November proves to be chillier and wetter than the preceding autumn months in Saint Sampson. Incredibly, this month brings the highest amount of rainfall totaling 87mm (3.43"), it gets accompanied by reduced sunlight hours. The temperature shows a downward trend, fluctuating from a low of 10.9°C (51.6°F) to a high of 13°C (55.4°F). Weather in November »Weather in December
The year wraps up with December bringing along the winter chill in Saint Sampson. Unlike the gradual decline of temperatures over the autumn months, December exhibits quicker temperature dives that go from 9.2°C (48.6°F) up to 11.1°C (52°F). 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 Saint Sampson, 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 Saint Sampson.
The month with the most snowfall in Saint Sampson is January, when snow falls for 0.3 days and typically aggregates up to 2mm (0.08") of snow.
In Saint Sampson, 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.
The coldest month in Saint Sampson, Guernsey, is February, with an average high-temperature of 9.2°C (48.6°F) and an average low-temperature of 7°C (44.6°F).
February through December are months without snowfall in Saint Sampson.
February is the month with the lowest UV index in Saint Sampson, Guernsey, with an average maximum UV index of 2.
The months with the highest humidity are June and July, with an average relative humidity of 84%.
The month with the longest days in Saint Sampson, Guernsey, is June, with an average of 16h and 12min of daylight.
July is the month with the least rainfall in Saint Sampson, Guernsey. Rain falls for 12.8 days and accumulates 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 Saint Sampson, Guernsey, are July through September, with an average maximum UV index of 5.
Saint Sampson's August weather, marked by an average high temperature of 17.8°C (64°F) and an average low temperature of 15.8°C (60.4°F), is the warmest in the year.
On Sunday, 27. October 2024, at 02:00, Daylight Saving Time ends in Saint Sampson, 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 Saint Sampson are November and December, with an average relative humidity of 77%.
November is the month with the most rainfall in Saint Sampson. Rain falls for 22.8 days and accumulates 87mm (3.43") of precipitation.
December has the shortest days of the year, with an average of 8h and 12min of daylight.
Average temperature
Saint Sampson, 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
Saint Sampson, 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
Saint Sampson, 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
Saint Sampson, 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
Saint Sampson, Guernsey
The wettest month (with the highest rainfall) is November (87mm).
The driest month (with the least rainfall) is July (26mm).
Average rainfall days
Saint Sampson, 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
Saint Sampson, 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
Saint Sampson, 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
Saint Sampson, 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
Saint Sampson, 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
Saint Sampson, 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
Saint Sampson, 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
Saint Sampson, 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).
