Climate and monthly weather forecastPortinfer, Jersey
Climate and monthly weather forecast
The climate of Portinfer
Designated under the Köppen climate classification as Cfb or Marine west coast, warm summer, Portinfer nestles on the northern coastline of the island of Jersey. Positioned between broad Atlantic Ocean and nestled between England and France, it enjoys moderate year-round temperatures and enduring maritime influence.Throughout the year, temperatures typically range from a low of 6.9°C (44.4°F) in February to a peak of 18.1°C (64.6°F) in August. This common trend, of moderate variation, persists across various weather factors. Humidity is reasonably consistent at around 78% to 84% annually, while visibility remains unvaried and excellent at 10km (6.2mi) throughout the year.
Rainfall in Portinfer shows a distinct pattern with months of November and December receiving the highest precipitation of 74mm (2.91") and 66mm (2.6") respectively. There are minimal chances of snow disruption, with only one snowfall each projected in January and November. Wind speeds have a bit higher fluctuation, usually peaking at 34.3km/h (21.3mph) in December, while averaging around 20.6km/h (12.8mph) in July.
In terms of sunshine, the highest daily average arrives in July with 9.8 hours, but drops dramatically to only 4 hours in the darker months of December and January. Across the twelve-month calendar, daylight varies between the extremes of 8.3 hours in December to 16.2 hours in June.
The best time to visit Portinfer
With an enjoyable contrast of pleasant temperatures and lower rainfall, between May and September can be considered as the most favorable time to explore Portinfer. Association with higher visibility of 10km (6.2mi), increased sunlight duration of 9.2 hours to 9.8 hours, and lower wind speeds of 22.3km/h (13.9mph) to 21.2km/h (13.2mph), enhances the visitor experience in the summer months.The worst time to visit Portinfer
The months from November through February may pose slight discomfort for visitors due to lower temperatures, increased precipitation and shorter daylight hours. While the average daily sunshine dwindles from 4.1 hours in December to 4 hours in January, the higher wind speeds notably in December might detract the visitors with an increase of 32.9km/h (20.4mph) to 34.3km/h (21.3mph). Additionally, November and December has the highest average rainfall, with 74mm (2.91") and 66mm (2.6") respectively.Spring weather in Portinfer
From March to May, Portinfer experiences a gentle transition from winter to summer. March brings temperatures from 9°C (48.2°F) to 7.6°C (45.7°F), while May sees a high of 13.2°C (55.8°F) and low of 10.9°C (51.6°F). The rainfall decreases from March to April from 37mm (1.46") to 32mm (1.26"), and again in May to 27mm (1.06"). Daily sunlight steadily rises from 6.4 hours in March to 9.3 hours by May, suggesting the arrival of longer and brighter days.Summer weather in Portinfer
Summer in Portinfer extends from June through August with comfortable temperatures ranging from 15.7°C (60.3°F) to 18.1°C (64.6°F). Rainfall shows a rise in June with 38mm (1.5"), but drops to 27mm (1.06") in July before a mild uptick in August with 43mm (1.69"). While August tops the warmest month with a temperature of 18.1°C (64.6°F) and 9.3 hours of Sun, it also features more frequent sea fog due to higher humidity at 84%.Autumn weather in Portinfer
Autumn in Portinfer, from September to November, presents gradually falling temperatures combined with increasing rainfall. September opens with a delightful 15.6°C (60.1°F) which slips to a cool 10.9°C (51.6°F) by November. Rainfall mirrors this descent, growing from 29mm (1.14") in September to a rather damp 74mm (2.91") by November.Winter weather in Portinfer
Winter in this part of Jersey maintains moderate conditions compared to mainland Europe. With lowest temperatures from 10.8°C (51.4°F) in December to 7.3°C (45.1°F) in January, it’s unusually mild. The averages range of daylight is from 9.1 hours in November to 8.3 hours in December. The rainfall sways around 66mm (2.6") in December and minimizes to 55mm (2.17") in January. Surprisingly, snow, at 1mm (0.04") in January, is an occasional visitor rather than a regular winter occurrence.Weather in January
Kicking off the year in Portinfer, Jersey, the weather tends to be mild, with temperatures keeping between 9.5°C (49.1°F) and 7.3°C (45.1°F). Moisture in the air remains high, resulting in a bit of a damp feel throughout the month, reinforcing the winter feel. Weather in January »Weather in February
February shares similarities with January in terms of weather dynamics in Portinfer. There is a minute increase in daylight hours and sunshine occurrence. Overall, temperatures remain steady and rainfall decreases only slightly. Weather in February »Weather in March
As Portinfer transitions into spring, March offers an increasing amount of daylight hours, up to 11.9 hours. The average temperatures subsequently rise, while wind speeds begin to subside. Yet, the town doesn't dismiss the winter quite so quickly. Weather in March »Weather in April
With April arrives the typical spring weather in Portinfer. Temperature continues its ascent and daylight hours grow longer. Relative humidity keeps steady, contrasting with the descending wind speeds that can now be as wind gust as 36.3km/h (22.6mph). Weather in April »Weather in May
May brings Portinfer a further injection of warmth as summer approaches. Increased hours of daylight and temperatures begin to make outdoor activities more pleasing. Decreasing wind speed and almost equal rainfall to the previous month, helps maintain clear skies and thus, more sunlight. Weather in May »Weather in June
June marks the start of summer in Portinfer, featuring longer daylight hours, peaking at 16.2 hours. Temperatures increase slightly, creating an overall mild and comfortable climate. Although rainfall increases to 38mm (1.5"), the days of rainfall remain almost the same compared to May. Weather in June »Weather in July
July is the warmest month, on average, in Portinfer with temperatures reaching up to 17.6°C (63.7°F). Despite being the peak of summer, the volume of rainfall remains moderate and doesn't disrupt outdoor activities. The UV index remains at 5, making sun protection a wise choice during peak hours of sunshine. Weather in July »Weather in August
August continues the mild summer weather in Portinfer. Temperatures are almost on par with July, with the maximum value reaching 18.1°C (64.6°F). Rainfall increases slightly, but it's countered with an equal increase in the days of rainfall. Weather in August »Weather in September
September ushers into Portinfer the start of autumn, with temperatures slowly decreasing from the summer peak. The decline occurs as daylight hours recede to 12.6 hours with pressure registering at 1018mb. However, wind speed starts climbing again, bringing a slight chill in the air. Weather in September »Weather in October
October sees noticeable shifts in Portinfer’s weather as temperatures drop further and rainfall significantly increases to 55mm (2.17"). While daylight hours keep falling, the intensity of wind gusts reaches 39.4km/h (24.5mph), reinforcing the autumnal feel. Weather in October »Weather in November
November signals the advent of winter in Portinfer, introducing chillier days and nights with temperatures sliding down to 10.9°C (51.6°F). A considerable increase in rainfall to 74mm (2.91") emphasizes the change of seasons. Weather in November »Weather in December
December wraps up the year in Portinfer with the coldest average temperatures between 10.8°C (51.4°F) and 9.2°C (48.6°F), and rain accumulating to 66mm (2.6"). With the shortest daylight hours, the days are brief and the nights long, typical of the winter season. Weather in December »Updated: Jun 27, 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 Portinfer, during the entire year, the rain falls for 191.6 days and collects up to 531mm (20.91") of precipitation.
Months with snowfall are January, March and November.
The months with the most snowfall are January, March and November, with an average 1mm (0.04") of accumulated snow.
In Portinfer, during the entire year, snow falls for 1.2 days and aggregates up to 3mm (0.12") of snow.
The month with the least sunshine is January, with an average of 4h of sunshine.
During the coldest month in Portinfer, February, temperatures average a high of 9°C (48.2°F) and a low of 6.9°C (44.4°F).
February, November and December, with an average relative humidity of 78%, are the least humid months.
In Portinfer, snow does not fall in February, April through October and December.
The month with the lowest UV index is February, with an average maximum UV index of 2.
May and July are months with the least rain in Portinfer when the rain falls for 12.7 days and typically aggregates up to 27mm (1.06") of rain.
With an average relative humidity of 84%, June is the most humid month.
June has the longest days of the year, with an average of 16h and 12min of daylight.
June through August, with an average maximum UV index of 5, are months with the highest UV index.
July has the most sunshine of the year, with an average of 9.8h of sunshine.
August, marked by an average high-temperature of 18.1°C (64.6°F) and a low-temperature of 16.3°C (61.3°F), is the warmest month.
On Sunday, 27. October 2024, at 02:00, Daylight Saving Time ends, 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 month with the most rainfall is November, when the rain falls for 20.7 days and typically aggregates up to 74mm (2.91") of precipitation.
The month with the shortest days is December, with an average of 8h and 18min of daylight.
Average temperature
Portinfer, Jersey
The warmest month (with the highest average high temperature) is August (18.1°C).
The month with the lowest average high temperature is February (9°C).
The month with the highest average low temperature is August (16.3°C).
The coldest month (with the lowest average low temperature) is February (6.9°C).
Average pressure
Portinfer, Jersey
- Average pressure in January:
1016.4mbar - Average pressure in February:
1015.4mbar - Average pressure in March:
1016.3mbar - Average pressure in April:
1015.6mbar - Average pressure in May:
1017.3mbar - Average pressure in June:
1016.9mbar
- Average pressure in July:
1016.9mbar - Average pressure in August:
1016.5mbar - Average pressure in September:
1018mbar - Average pressure in October:
1016mbar - Average pressure in November:
1011.8mbar - Average pressure in December:
1016.9mbar
The month with the highest atmospheric pressure is September (1018mbar).
The month with the lowest atmospheric pressure is November (1011.8mbar).
Average wind speed
Portinfer, Jersey
- Average wind speed in January:
32.3km/h - Average wind speed in February:
32.1km/h - Average wind speed in March:
28.3km/h - Average wind speed in April:
23.5km/h - Average wind speed in May:
22.3km/h - Average wind speed in June:
21.4km/h
- Average wind speed in July:
20.6km/h - Average wind speed in August:
21.2km/h - Average wind speed in September:
23.9km/h - Average wind speed in October:
27.3km/h - Average wind speed in November:
32.9km/h - Average wind speed in December:
34.3km/h
The windiest month (with the highest average wind speed) is December (34.3km/h).
The calmest month (with the lowest average wind speed) is July (20.6km/h).
Average humidity
Portinfer, Jersey
The month with the highest relative humidity is June (84%).
The months with the lowest relative humidity are February, November and December (78%).
Average rainfall
Portinfer, Jersey
The wettest month (with the highest rainfall) is November (74mm).
The driest months (with the least rainfall) are May and July (27mm).
Average rainfall days
Portinfer, Jersey
- Average rainfall days in January:
20.3 days - Average rainfall days in February:
17.5 days - Average rainfall days in March:
15.8 days - Average rainfall days in April:
13.3 days - Average rainfall days in May:
12.7 days - Average rainfall days in June:
13.3 days
- Average rainfall days in July:
13.2 days - Average rainfall days in August:
13.8 days - Average rainfall days in September:
13.4 days - Average rainfall days in October:
17.1 days - Average rainfall days in November:
20.7 days - Average rainfall days in December:
20.5 days
The month with the highest number of rainy days is November (20.7 days).
The month with the least rainy days is May (12.7 days).
Average snowfall
Portinfer, Jersey
The months with the highest snowfall are January, March and November (1mm).
The months with the least snowfall are February, April, May, June, July, August, September, October and December (0mm).
Average snowfall days
Portinfer, Jersey
- Average snowfall days in January:
0.2 days - Average snowfall days in February:
0.3 days - Average snowfall days in March:
0.3 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:
0.2 days - Average snowfall days in December:
0.2 days
The months with the highest number of snowfall days are February and March (0.3 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).
Average daylight / Average sunshine
Portinfer, Jersey
- 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 18min - 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 18min
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 18min).
- Average sunshine in January:
4h and 0min - Average sunshine in February:
4h and 18min - Average sunshine in March:
6h and 24min - Average sunshine in April:
9h and 18min - Average sunshine in May:
9h and 18min - Average sunshine in June:
9h and 12min
- Average sunshine in July:
9h and 48min - Average sunshine in August:
9h and 18min - Average sunshine in September:
8h and 36min - Average sunshine in October:
5h and 0min - Average sunshine in November:
4h and 6min - Average sunshine in December:
4h and 6min
The month with the most sunshine is July (Average sunshine: 9h and 48min).
The month with the least sunshine is January (Average sunshine: 4h and 0min).
Average sunshine days
Portinfer, Jersey
- Average sunshine days in January:
7.9 days - Average sunshine days in February:
8.4 days - Average sunshine days in March:
12.5 days - Average sunshine days in April:
14.2 days - Average sunshine days in May:
15.3 days - Average sunshine days in June:
14.8 days
- Average sunshine days in July:
14.9 days - Average sunshine days in August:
14.4 days - Average sunshine days in September:
14.1 days - Average sunshine days in October:
11.5 days - Average sunshine days in November:
6.5 days - Average sunshine days in December:
7.4 days
The month with the most sunshine days is May (15.3 days).
The month with the least sunshine days is November (6.5 days).
Average UV index
Portinfer, Jersey
The months with the highest UV index are June, July and August (UV index 5).
The month with the lowest UV index is February (UV index 2).
Average cloud cover
Portinfer, Jersey
The months with the most cloud cover are January, November and December (Cloud cover 61).
The month with the least cloud cover is July (Cloud cover 36).
Average visibility
Portinfer, Jersey
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).
