Climate and monthly weather forecastSaint Peter Port, Guernsey
Climate and monthly weather forecast
The climate of Saint Peter Port
Saint Peter Port, nestled in Guernsey, reflects a Marine west coast, warm summer type of climate, as categorized under the Köppen climate classification Cfb. On a broad level, the city experiences moderate temperatures throughout the year. Peaks in temperature are not overly drastic, with January maintaining the lowest average low temperature, 7°C (44.6°F), and August reaching the highest average high, 17.8°C (64°F).Dealing with relative humidity, a dampness of the air ranges from 77% in December and January to 84% in June and July, showcasing a slight difference across the year. While the city does not experience any snowfall, rainfall amounts vary notably, escalating from a minimum of 26mm (1.02") in July to a substantial 87mm (3.43") in November. Rainfall days show similar turbulence, with July at the lower end with 12.8 days and November exhibiting maximum rainfall days, reaching a count of 22.8.
Focusing on sunshine hours, a distinct oscillation can be observed throughout the year, ranging from an annual low of 3.9 hours per day in December and January, ascending to an impressive 9.7 hours per day in July. A clue into the wind strength suggests a gradual increase from 21.9km/h (13.6mph) in July up to 36km/h (22.4mph) in December, leading to a mildly windy and breezy climate.
The best time to visit Saint Peter Port
Considering the blend of temperatures, precipitation, and daylight hours, the period from sustained from June to August emerges as the most promising time for a visit. This period not only experiences the warmest temperatures, ranging from 15.2°C (59.4°F) to 17.8°C (64°F), but also, it has the maximum amount of sunshine hours, averaging between 9.1 hours and 9.7 hours per day. Additionally, rainfall during these months leans towards the lower side, between 26mm (1.02") and 41mm (1.61"), and the sea temperatures ascend to a comfortable range between 14°C (57.2°F) and 17°C (62.6°F).The worst time to visit Saint Peter Port
On the contrary, the span between November and January might not be the best time to plan a visit. This period is accompanied by colder temperatures varying from 7°C (44.6°F) to 9.8°C (49.6°F), shorter daylight hours ranging from 8.3 hours to 9.1 hours per day, and the maximum annual rainfall indexes, rising from 70mm (2.76") to 87mm (3.43").Spring weather in Saint Peter Port
In Saint Peter Port, Spring spans from March to May and sees an uplift in temperature. The average high temperature lies between 9.8°C (49.6°F) in March and 12.8°C (55°F) in May. During this period, the rainfall counts narrows down from 38mm (1.5") to 27mm (1.06"). Sunshine hours start to escalate, providing between 6.2 hours and 9.1 hours of clear skies. All these factors contribute to a welcoming spring season in the city.Summer weather in Saint Peter Port
Summer months, ranging from June to August, provide the most pleasing weather conditions in Saint Peter Port. The high temperatures sit comfortably between the range of 15.2°C (59.4°F) and 17.8°C (64°F), with the low temperatures optimally sitting in the range of 13.2°C (55.8°F) and 15.8°C (60.4°F). Rainfall levels are also quite modest with amounts oscillating between 26mm (1.02") and 41mm (1.61"). With an ample amount of sunlight, averaging between 9.1 hours to 9.7 hours per day, the city offers an enjoyable summer experience.Autumn weather in Saint Peter Port
The autumn months of September to November present a gradual decline in temperature, starting at 17.2°C (63°F) in September and decreasing to 13°C (55.4°F) by November. The lower temperatures also highlight a similar downward trend, slipping from 15.4°C (59.7°F) to 10.9°C (51.6°F). Over these months, rainfall starts to increase significantly, from 31mm (1.22") in September to 87mm (3.43") by November, along with an increase in the number of rainfall days, matching between 18.5 days and 22.8 days. Despite the increase in rainfall, the city maintains a modest amount of sunlight during this period.Winter weather in Saint Peter Port
Winter in Saint Peter Port, stretching from December to February, witnesses the chilliest temperatures, averaging between 7°C (44.6°F) and 9.8°C (49.6°F). Nevertheless, the sea temperatures remain slightly higher, hovering between 10°C (50°F) and 11°C (51.8°F). The city experiences its highest humidity, 78%, and rainfall reaching between 51mm (2.01") and 70mm (2.76"), with an average of 20.37 rainfall days in January. Even in the darkest months, Saint Peter Port receives reasonable daylight hours, stretching from 8.3 hours to 10.2 hours. While winters are fairly cold and damp, the city's weather remains relatively mild compared to many other locations.Weather in January
The year in Saint Peter Port, Guernsey begins with January, a month notable for relatively cool temperatures and high rainfall, accentuated by 63mm (2.48") of rain across 22 rainy days. The chill in the air is signaled by relatively low sea temperatures and the presence of snowfall, though it must be noted that snow remains an uncommon occurrence. Weather in January »Weather in February
February marks a slight drying trend in Saint Peter Port, Guernsey, with a drop in rainfall to 51mm (2.01") over slightly fewer rainy days. A hint of the approaching spring is visible as the daily sunshine hours start to increase, but winter holds fast with brisk wind speeds and relatively low temperatures. Weather in February »Weather in March
As March rolls in, the first signs of spring are visible in Saint Peter Port, Guernsey with temperatures creeping up and an overall decrease in rainfall to 38mm (1.5") spread across fewer days. Although the days are becoming longer, wind speeds remain moderate, and the sea temperatures are still too low for most marine activities. Weather in March »Weather in April
April in Saint Peter Port, Guernsey is marked by the full onset of spring, with noticeably warmer days. Rainfall during April is recorded at only 32mm (1.26") and is dispersed over fewer days. The wind speeds decrease significantly, offering a welcome respite from the nippiness felt in the preceding months. Weather in April »Weather in May
May ushers in an appreciably warm period in Saint Peter Port, Guernsey with many sunny days. Compared to April, rainfall decreases to 27mm (1.06") and is experienced over comparatively fewer days, hence arriving at the driest month of the year. Weather in May »Weather in June
June in Saint Peter Port, Guernsey witnesses a further increase in temperatures, setting the stage for forthcoming summer. Interestingly, there is a minor rise in the amount of rainfall to 33mm (1.3"), though this happens over a fractional increase in rainy days. Weather in June »Weather in July
As the year reaches its zenith, July is the warmest month in Saint Peter Port, Guernsey, with temperatures reaching a peak of 16.9°C (62.4°F). The wind speed reduces somewhat from June, contributing to the warm, summery sensation. Weather in July »Weather in August
August in Saint Peter Port, Guernsey carries forward the warm and pleasant weather conditions of July. There is a slight increase in rainfall to 41mm (1.61") over more days, suggesting the incipient easing of summer. However, with temperatures enjoying their peak and wind speeds remaining moderate, the weather conditions are still predominantly summery. Weather in August »Weather in September
As summer begins to recede in Saint Peter Port, Guernsey, September brings a gentle mix of warmth and freshness in the air. Rainfall records a slight decrease to 31mm (1.22") over relatively fewer days. The daylight hours start to dwindle, heralding the slow approach of winter. Weather in September »Weather in October
October in Saint Peter Port, Guernsey, signifies the full onset of autumn with a marked decrease in temperatures and longer, cooler nights. An increase in rainfall to 58mm (2.28") over a rise in the number of rainy days, underlines the progression towards winter. Weather in October »Weather in November
In November, Saint Peter Port, Guernsey registers a further drop in temperature, and with 87mm (3.43") of rain over 22.8 days, it becomes the wettest month of the year. As winter approaches, reduction in daylight hours is noticeable, and the sea temperature also shows a considerable decline. Weather in November »Weather in December
December marks the beginning of winter in Saint Peter Port, Guernsey. Rainfall remains high at 70mm (2.76") but occurs over fewer days than in November. Temperatures continue to decline, and wind speeds reach their peak, amplifying the seasonal chill. 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 Peter Port, Guernsey, during the entire year, the rain falls for 196.3 days and collects up to 557mm (21.93") of precipitation.
The only month with snowfall is January.
January is the month with the most snowfall in Saint Peter Port, Guernsey. Snow falls for 0.3 days and accumulates 2mm (0.08") of snow.
In Saint Peter Port, 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 Saint Peter Port, Guernsey.
February, marked by an average high-temperature of 9.2°C (48.6°F) and a low-temperature of 7°C (44.6°F), is the coldest month.
February through December are months without snowfall in Saint Peter Port.
The months with the coldest seawater in Saint Peter Port are February and March, with an average sea temperature of 9°C (48.2°F).
February is the month with the lowest UV index in Saint Peter Port, 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%.
With an average of 16h and 12min of daylight, June has the longest days of the year in Saint Peter Port, Guernsey.
The month with the least rainfall in Saint Peter Port 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 are July through September, with an average maximum UV index of 5.
Saint Peter Port, Guernsey, witnesses the warmest weather in August, with temperatures averaging a high of 17.8°C (64°F) and a low of 15.8°C (60.4°F).
With an average sea temperature of 17°C (62.6°F), August is the month with the warmest seawater in Saint Peter Port, Guernsey.
On Sunday, 27. October 2024, at 02:00, Daylight Saving Time ends in Saint Peter Port, 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.
November and December, with an average relative humidity of 77%, are the least humid months in Saint Peter Port.
The month with the most rainfall in Saint Peter Port is November, when the rain falls for 22.8 days and typically aggregates up to 87mm (3.43") of precipitation.
The month with the shortest days in Saint Peter Port is December, with an average of 8h and 12min of daylight.
Average temperature
Saint Peter Port, 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 Peter Port, 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 Peter Port, 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 Peter Port, 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 Peter Port, 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 Peter Port, 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 Peter Port, 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 Peter Port, 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 sea temperature
Saint Peter Port, Guernsey
The best month for swimming (with the highest average sea temperature) is August (17°C).
The coldest months (with the lowest average sea temperature) are February and March (9°C).
Average daylight / Average sunshine
Saint Peter Port, 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
Saint Peter Port, 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 Peter Port, 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 Peter Port, 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 Peter Port, 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).
