Climate and monthly weather forecastSaint Johns, Guernsey
Climate and monthly weather forecast
Weather in January
January, like December, is another chilly winter month in Saint Johns, Guernsey, with an average temperature fluctuating between 7.8°C (46°F) and 9.8°C (49.6°F). The onset of January manifests an average high-temperature of a chilly 9.8°C (49.6°F), demonstrating a minor variation from the preceding month. Weather in January »Weather in February
February, the last month of the winter in Saint Johns, is another chilly month, with temperature in the range of an average high of 9.2°C (48.6°F) and an average low of 7°C (44.6°F). Saint Johns's February weather reaches an average high of 9.2°C (48.6°F) and an average low of 7°C (44.6°F), making it the coldest month. Weather in February »Weather in March
The first month of the spring, March, is also a frosty month in Saint Johns, Guernsey, with temperature in the range of an average high of 9.8°C (49.6°F) and an average low of 7.4°C (45.3°F). The advent of March signifies a minor shift to an average high-temperature of a still chilly 9.8°C (49.6°F), aligning closely with February. Weather in March »Weather in April
April is a fresh spring month in Saint Johns, Guernsey, with an average temperature ranging between max 11°C (51.8°F) and min 8.9°C (48°F). During April, Saint Johns records an average high-temperature of a fresh 11°C (51.8°F), marking a slight divergence from March's 9.8°C (49.6°F). Weather in April »Weather in May
The last month of the spring, May, is also a fresh month in Saint Johns, Guernsey, with an average temperature ranging between min 10.6°C (51.1°F) and max 12.8°C (55°F). May's advent notes a subtle adjustment in average high-temperature to a still cool 12.8°C (55°F) from April. Weather in May »Weather in June
June, the first month of the summer in Saint Johns, is a refreshing month, with an average temperature fluctuating between 13.2°C (55.8°F) and 15.2°C (59.4°F). In June, the average high-temperature registers at a moderate 15.2°C (59.4°F), nearly identical to May's 12.8°C (55°F). Weather in June »Weather in July
July is a comfortable summer month in Saint Johns, Guernsey, with an average temperature ranging between min 15.3°C (59.5°F) and max 16.9°C (62.4°F). Saint Johns marks the arrival of July with an average high-temperature of a comfortable 16.9°C (62.4°F), hardly different from June's 15.2°C (59.4°F). Weather in July »Weather in August
August, the last month of the summer in Saint Johns, is another refreshing month, with an average temperature fluctuating between 17.8°C (64°F) and 15.8°C (60.4°F). In Saint Johns, the average temperatures in August are the highest, with a peak at 17.8°C (64°F) and a low of 15.8°C (60.4°F). Weather in August »Weather in September
The first month of the autumn, September, is still a refreshing month in Saint Johns, Guernsey, with an average temperature fluctuating between 15.4°C (59.7°F) and 17.2°C (63°F). September's average high-temperature is a still refreshing 17.2°C (63°F), maintaining a close comparison with August's 17.8°C (64°F). Weather in September »Weather in October
October, like September, is another refreshing autumn month in Saint Johns, Guernsey, with temperature in the range of an average high of 15.5°C (59.9°F) and an average low of 13.6°C (56.5°F). Saint Johns experiences an average high-temperature of a still refreshing 15.5°C (59.9°F) with the onset of October, subtly varied from September's 17.2°C (63°F). Weather in October »Weather in November
The last month of the autumn, November, is another mild month in Saint Johns, Guernsey, with an average temperature fluctuating between 10.9°C (51.6°F) and 13°C (55.4°F). Saint Johns experiences a transition to a still mild 13°C (55.4°F) in average high-temperatures with the arrival of November, not greatly differing from October's 15.5°C (59.9°F). Weather in November »Weather in December
The first month of the winter, December, is still a cool month in Saint Johns, Guernsey, with an average temperature ranging between max 11.1°C (52°F) and min 9.2°C (48.6°F). Saint Johns experiences an average high-temperature of a fresh 11.1°C (52°F) in December, subtly different from November's 13°C (55.4°F). Weather in December »Updated: Aug 28, 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 Johns, 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.
The month with the most snowfall is January, when snow falls for 0.3 days and typically aggregates up to 2mm (0.08") of snow.
Throughout the year, there are 0.5 snowfall days, and 2mm (0.08") of snow is accumulated.
January, November and December, with an average of 3.9h of sunshine, are months with the least sunshine.
With average high temperatures of 9.2°C (48.6°F) and lows of 7°C (44.6°F), February is the coldest month.
In Saint Johns, snow does not fall in February through December.
The month with the lowest UV index is February, 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.
July is the month with the least rainfall in Saint Johns. Rain falls for 12.8 days and accumulates 26mm (1.02") of precipitation.
With an average of 9.7h of sunshine, July has the most sunshine of the year.
July through September, with an average maximum UV index of 5, are months with the highest UV index.
August is the month when Saint Johns sees the average highest temperatures, with a 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, 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 are November and December, with an average relative humidity of 77%.
November is the month with the most rainfall. Rain falls for 22.8 days and accumulates 87mm (3.43") of precipitation.
The month with the shortest days is December, with an average of 8h and 12min of daylight.
Average temperature
Saint Johns, 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 Johns, 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 Johns, 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 Johns, 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 Johns, 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 Johns, 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 Johns, 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 Johns, 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 Johns, 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 Johns, 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 Johns, 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 Johns, 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 Johns, 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).
