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Contents
- The climate of Isles of Scilly
- The best time to visit Isles of Scilly
- The worst time to visit Isles of Scilly
- Spring weather in Isles of Scilly
- Summer weather in Isles of Scilly
- Winter weather in Isles of Scilly
- Weather in January
- Weather in February
- Weather in March
- Weather in April
- Weather in May
- Weather in June
- Weather in July
- Weather in August
- Weather in September
- Weather in October
- Weather in November
- Weather in December
- Frequently asked questions
- Average temperature
- Average pressure
- Average wind speed
- Average humidity
- Average rainfall
- Average rainfall days
- Average snowfall days
- Average sea temperature
- Average daylight
- Average sunshine
- Average sunshine days
- Average UV index
- Average cloud cover
- Average visibility
The climate of Isles of Scilly
The Isles of Scilly, an archipelago off the south western tip of the Cornish peninsula of Great Britain, are home to a maritime climate. This climate, according to the Köppen climate classification, can be recognised as 'Cfb', signifying an oceanic climate. The geographical position of the Isles, located in the Atlantic Ocean, allows for a generally mild but humid weather throughout the year.
Delving into the climatological data reveals a temperate climate with slight variations throughout the year. The warmest temperatures usually occur in July and August, peaking at 17.2°C (63°F), while the coldest month is February with the mercury dropping to an average low of 7.9°C (46.2°F). Rainfall is experienced throughout the year, with November receiving the highest average rainfall of 86mm (3.39"). The Isles enjoy between 3.9 hours to 8.5 hours of sunshine per day, from December to May respectively.
Humidity levels in the Isles remain quite stable throughout the year, ranging from 78% to 85%. Snowfall is an incredibly rare occurrence, evidenced by the almost non-existent figures in the data. Wind speeds, however, tend to vary from 23.8km/h (14.8mph) to 35.9km/h (22.3mph). The perception of a continuous breeze is typical due to the island's maritime location. The Isles also have a percentage cloud coverage above 40% throughout the year, contributing to the overall damp conditions.
Delving into the climatological data reveals a temperate climate with slight variations throughout the year. The warmest temperatures usually occur in July and August, peaking at 17.2°C (63°F), while the coldest month is February with the mercury dropping to an average low of 7.9°C (46.2°F). Rainfall is experienced throughout the year, with November receiving the highest average rainfall of 86mm (3.39"). The Isles enjoy between 3.9 hours to 8.5 hours of sunshine per day, from December to May respectively.
Humidity levels in the Isles remain quite stable throughout the year, ranging from 78% to 85%. Snowfall is an incredibly rare occurrence, evidenced by the almost non-existent figures in the data. Wind speeds, however, tend to vary from 23.8km/h (14.8mph) to 35.9km/h (22.3mph). The perception of a continuous breeze is typical due to the island's maritime location. The Isles also have a percentage cloud coverage above 40% throughout the year, contributing to the overall damp conditions.
The best time to visit Isles of Scilly
Given the mild, relatively stable year-round climate of the Isles of Scilly, the ideal time to visit would either be late Spring or early Summer. This period, stretching from May to July, allows for enjoyable temperatures ranging from 12.3°C (54.1°F) to 17°C (62.6°F). The humidity is not as high as in the latter months of the year, averaging between 84% to 85%. Despite May having the lowest average rainfall at 29mm (1.14"), some rainfall is expected almost all year round.
The worst time to visit Isles of Scilly
The late autumn and winter months from November to February should be avoided by those who would prefer not to experience the coldest and wettest weather conditions. Temperatures during this period dip below 10°C (50°F) and November records the highest rainfall with 86mm (3.39"). In addition, the lowest hours of sunshine are recorded between December and February, thus days can be quite short and gloomy.
Spring weather in Isles of Scilly
Spring on the Isles of Scilly witnesses a gradual increase in temperatures from 9.8°C (49.6°F) in March to 12.3°C (54.1°F) in May. This transition from winter introduces more daylight hours, extending from 11.9 hours in March to 15.4 hours in May. Rainfall also decreases significantly during this season, making spring a promising time to visit.
Summer weather in Isles of Scilly
The summer months from June to August offer the highest average temperatures, reaching a peak of 17.2°C (63°F) in August. Relative humidity hits its yearly high at 85% during this season, contributing to the muggy atmosphere. Despite this, the summer also sees fewer rainy days. If outdoor activities are planned, the longest daylight hours (16.3 hours in June) and the highest sea temperatures, autumn sees a gradual decline in temperatures as winter approaches. By November, the temperature averages drop to 12.5°C (54.5°F). Coupled with an increase in rainfall days from 14.4 in September to 21.3 in November, this season is considerably less desirable for visitors intending to partake in outdoor activities.
Winter weather in Isles of Scilly
Winter on the Isles of Scilly is met with the lowest recorded temperatures, averaging 9.7°C (49.5°F) in February. Alongside the lower temperatures, the reduced number of sunshine hours (from 9.1 hours in December to 8.2 hours in February) may offer a less pleasant weather experience. Despite this, winter storms and distinct sea views may still provide unique spectacles for those who enjoy nature's more tumultuous displays.
Weather in January
January ushers in the year with quite a chilly tone at Isles of Scilly, United Kingdom. The weather is typically drizzly, enveloped in chilly breezes. Variations in the temperature are not extreme. However, it records the highest average wind speed of 34.6km/h (21.5mph) for the year, contributing to the chilling sensation. Weather in January »
Weather in February
February transforms the cold winter vibes as its weather starts to shift from the January ambiance. The windy conditions persist from last month, adding a mild increase of 0.4km/h (0.2mph). Residents experience a reduced average rainfall from 61mm (2.4") to 51mm (2.01"), yet the skies may still retain some gloominess. Weather in February »
Weather in March
In March, Isles of Scilly start to experience notable changes in its weather compared to February. The transition from winter to spring is underway, causing the environment to slowly warm up. The change also brings a touch of moisture to the air, as seen by the steady increase in relative humidity up to 80%. Weather in March »
Weather in April
As April enters Isles of Scilly, the United Kingdom, the transformation from winter concludes, and spring becomes evident. The average temperature experiences a noteworthy increase, starting to hit the double-digit mark. As atmospheric stabilization continues, the wind speed decreases to 26.3km/h (16.3mph). Weather in April »
Weather in May
In May, Isles of Scilly receives a warm embrace from spring and enters the prelude of summer. The motion from the chilly winter months into warmer times becomes even clearer, inducing comfort among its residents. With an average temperature of 12.3°C (54.1°F), this becomes the warmest month yet. Weather in May »
Weather in June
June showcases Isles of Scilly's imminent transition from spring to summer. The weather undergoes a favorable change, allowing residents to reap the benefits of summer before its official arrival. The sun stays up longer, gracing the Isles with the maximum daylight hours of 16.3 h for the year. Weather in June »
Weather in July
July marks the height of summer in the Isles of Scilly, United Kingdom. The increase in temperature is evident; however, it does not reach extreme heights, guaranteeing a delightful summer experience. The high point comes when the sea temperature reaches its yearly maximum at 16.6°C (61.9°F), perfect for indulging in various water-based activities. Weather in July »
Weather in August
In August, Isles of Scilly continues to revel in the charm of summer days. The weather remains relatively unchanged from July, maintaining the same level of warmth and vitality. Temperatures are the highest for the year during this month with average sea temperature at 17.3°C (63.1°F). Weather in August »
Weather in September
As September arrives, Isles of Scilly prepares to bid farewell to the summer season. Subtle changes in weather can be noticed as the month progresses. The warmth of the sun still lingers, although the sea temperature records a slight drop to 16.8°C (62.2°F). Weather in September »
Weather in October
October at Isles of Scilly, United Kingdom, signifies the establishment of autumn. The weather undergoes remarkable change, transitioning from warmth to mild coolness. With an increased average rainfall of 72mm (2.83"), October receives the most precipitation since May. Weather in October »
Weather in November
As November approaches, the Isles of Scilly starts to experience the chill of the approaching winter months. The weather remains generally cool, yet not harsh or extreme. With an increased average rainfall of 86mm (3.39"), November is the wettest month of the year. Weather in November »
Weather in December
December marks the initiation of winter in the Isles of Scilly. The drop in temperatures results in a cold, yet tolerable winter. It exhibits a fluctuating pattern in the weather, transitioning from the cool nature of November to the cold embrace of January. Weather in December »
Updated: Aug 13, 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
What are the least humid months?
The months with the lowest humidity are January, February, November and December, with an average relative humidity of 78%.
How many days does it rain?
In Isles of Scilly, during the entire year, the rain falls for 200.8 days and collects up to 599mm (23.58") of precipitation.
When it does not snow?
January, February, April through September, November and December are months without snowfall.
How many days does it snow?
Throughout the year, there are 0.3 snowfall days.
What are the months with the lowest UV index?
The months with the lowest UV index are January through April, November and December, with an average maximum UV index of 3.
What are the coldest months in Isles of Scilly?
Isles of Scilly's February weather, with an average high temperature of 9.7°C (49.5°F) and an average low temperature of 7.9°C (46.2°F), tends to be the coldest of the year.
When does it snow?
March and October are months with snowfall in Isles of Scilly.
What is the snowiest month?
March has the most snowfall days of the year. Snow falls for 0.2 days.
What is the month with the coldest sea water?
March is the month with the coldest seawater, with an average sea temperature of 10.1°C (50.2°F).
What is the driest month?
May is the month with the least rainfall. Rain falls for 13.7 days and accumulates 29mm (1.14") of precipitation.
What month has the most sunshine?
The month with the most sunshine is May, with an average of 8.5h of sunshine.
What is the most humid month?
With an average relative humidity of 85%, June is the most humid month.
When are the longest days?
June has the longest days of the year, with an average of 16h and 18min of daylight.
What is the hottest time of year?
The warmest temperatures occur during August, when averages reach a peak of 17.2°C (63°F) and a low of 15.9°C (60.6°F).
When is the sea warmest?
August is the month with the warmest seawater, with an average sea temperature of 17.3°C (63.1°F).
When is the highest UV index?
August is the month with the highest UV index, with an average maximum UV index of 5.
When is Daylight Saving Time (DST)?
On Sunday, 27. October 2024, at 2:00 am, 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 1:00 am, and the time zone reverts from GMT to BST.
What is the wettest month?
The month with the most rainfall is November, when the rain falls for 21.3 days and typically aggregates up to 86mm (3.39") of precipitation.
What is the month with the shortest days?
With an average of 8h and 12min of daylight, December has the shortest days of the year.
What is the month with the least sunshine?
With an average of 3.9h of sunshine, December has the least sunshine of the year.
Average temperature
Isles of Scilly, United Kingdom
The warmest month (with the highest average high temperature) is August (17.2°C).
The month with the lowest average high temperature is February (9.7°C).
The month with the highest average low temperature is August (15.9°C).
The coldest month (with the lowest average low temperature) is February (7.9°C).
Average pressure
Isles of Scilly, United Kingdom
- Average pressure in January:
1014.9mbar - Average pressure in February:
1014.3mbar - Average pressure in March:
1015.7mbar - Average pressure in April:
1015.3mbar - Average pressure in May:
1017.3mbar - Average pressure in June:
1016.8mbar
- Average pressure in July:
1016.5mbar - Average pressure in August:
1015.8mbar - Average pressure in September:
1017.6mbar - Average pressure in October:
1014.5mbar - Average pressure in November:
1010.6mbar - Average pressure in December:
1015.1mbar
The month with the highest atmospheric pressure is September (1017.6mbar).
The month with the lowest atmospheric pressure is November (1010.6mbar).
Average wind speed
Isles of Scilly, United Kingdom
- Average wind speed in January:
34.6km/h - Average wind speed in February:
35km/h - Average wind speed in March:
30.8km/h - Average wind speed in April:
26.3km/h - Average wind speed in May:
24.4km/h - Average wind speed in June:
24.2km/h
- Average wind speed in July:
23.8km/h - Average wind speed in August:
25.4km/h - Average wind speed in September:
26.9km/h - Average wind speed in October:
29.1km/h - Average wind speed in November:
35.3km/h - Average wind speed in December:
35.9km/h
The windiest month (with the highest average wind speed) is December (35.9km/h).
The calmest month (with the lowest average wind speed) is July (23.8km/h).
Average humidity
Isles of Scilly, United Kingdom
The month with the highest relative humidity is June (85%).
The months with the lowest relative humidity are January, February, November and December (78%).
Average rainfall
Isles of Scilly, United Kingdom
The wettest month (with the highest rainfall) is November (86mm).
The driest month (with the least rainfall) is May (29mm).
Average rainfall days
Isles of Scilly, United Kingdom
- Average rainfall days in January:
20.9 days - Average rainfall days in February:
16.3 days - Average rainfall days in March:
16 days - Average rainfall days in April:
14.8 days - Average rainfall days in May:
13.7 days - Average rainfall days in June:
13.1 days
- Average rainfall days in July:
15.7 days - Average rainfall days in August:
16.4 days - Average rainfall days in September:
14.4 days - Average rainfall days in October:
17.5 days - Average rainfall days in November:
21.3 days - Average rainfall days in December:
20.7 days
The month with the highest number of rainy days is November (21.3 days).
The month with the least rainy days is June (13.1 days).
Average snowfall days
Isles of Scilly, United Kingdom
- Average snowfall days in January:
0 days - Average snowfall days in February:
0 days - Average snowfall days in March:
0.2 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:
0.1 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 March (0.2 days).
The months with the least snowfall days are January, February, April, May, June, July, August, September, November and December (0 days).
Average sea temperature
Isles of Scilly, United Kingdom
The best month for swimming (with the highest average sea temperature) is August (17.3°C).
The coldest month (with the lowest average sea temperature) is March (10.1°C).
Average daylight / Average sunshine
Isles of Scilly, United Kingdom
- Average daylight in January:
8h and 4min - Average daylight in February:
10h and 1min - Average daylight in March:
11h and 5min - Average daylight in April:
13h and 5min - Average daylight in May:
15h and 2min - Average daylight in June:
16h and 2min
- Average daylight in July:
15h and 5min - Average daylight in August:
14h and 2min - Average daylight in September:
12h and 4min - Average daylight in October:
10h and 4min - Average daylight in November:
9h and 1min - Average daylight in December:
8h and 1min
The month with the longest days is June (Average daylight: 16h and 18min).
The month with the shortest days is December (Average daylight: 8h and 12min).
- Average sunshine in January:
4h and 1min - Average sunshine in February:
4h and 2min - Average sunshine in March:
5h and 5min - Average sunshine in April:
8h and 2min - Average sunshine in May:
8h and 3min - Average sunshine in June:
8h and 2min
- Average sunshine in July:
8h and 2min - Average sunshine in August:
7h and 5min - Average sunshine in September:
7h and 1min - Average sunshine in October:
5h and 0min - Average sunshine in November:
4h and 1min - Average sunshine in December:
3h and 5min
The month with the most sunshine is May (Average sunshine: 8h and 30min).
The month with the least sunshine is December (Average sunshine: 3h and 54min).
Average sunshine days
Isles of Scilly, United Kingdom
- Average sunshine days in January:
6.5 days - Average sunshine days in February:
8.2 days - Average sunshine days in March:
11.2 days - Average sunshine days in April:
12.7 days - Average sunshine days in May:
14.5 days - Average sunshine days in June:
15 days
- Average sunshine days in July:
12.8 days - Average sunshine days in August:
10.3 days - Average sunshine days in September:
12.1 days - Average sunshine days in October:
10.1 days - Average sunshine days in November:
5.7 days - Average sunshine days in December:
6.3 days
The month with the most sunshine days is June (15 days).
The month with the least sunshine days is November (5.7 days).
Average UV index
Isles of Scilly, United Kingdom
The month with the highest UV index is August (UV index 5).
The months with the lowest UV index are January, February, March, April, November and December (UV index 3).
Average cloud cover
Isles of Scilly, United Kingdom
The months with the most cloud cover are January and December (Cloud cover 62).
The month with the least cloud cover is April (Cloud cover 44).
Average visibility
Isles of Scilly, United Kingdom
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).
Isles of Scilly, United Kingdom
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