The best times to visit Isles of Scilly for ideal weather are

May 21st to October 21st

based on average temperature and humidity from NOAA (the National Oceanic and Atmospheric Administration). Read below for more weather and travel details.

 

 


Other Isles of Scilly Travel Info

Weather in Isles of Scilly

Temperature

Average temperatures in Isles of Scilly vary little. Considering humidity, temperatures feel cold for about half of the year and otherwise nice with a chance of rain or snow throughout most of the year. The area is less temperate than some — in the 34th percentile for pleasant weather — compared to tourist destinations worldwide. Weeks with ideal weather are listed above. If you’re looking for the very warmest time to visit Isles of Scilly, the hottest months are August, July, and then September. See average monthly temperatures below. The warmest time of year is generally late July where highs are regularly around 66.9°F (19.4°C) with temperatures rarely dropping below 58.1°F (14.5°C) at night.

Isles of Scilly Temperatures (Fahrenheit)

Key
High
Average
Low

Isles of Scilly Temperatures (Celsius)

Key
High
Average
Low

“Feels-Like” Temperatures

The way we experience weather isn’t all about temperature. Higher temperatures affect us much more at higher humidity, and colder temperatures feel piercing with high winds. Our perceived temperatures factor in humidity and wind chill to better represent how hot or cold the day feels to a person.

Isles of Scilly Perceived Temperature (F)

Key
High
Average
Low

Isles of Scilly Perceived Temperature (C)

Key
High
Average
Low

 

Average Isles of Scilly Temperatures by Month

Daily highs (averaged for the month) usually give the best indication of the weather. A significantly lower mean and low generally just means it gets colder at night.

Show Fahrenheit

Month Avg. High (°F) Avg. Mean (°F) Avg. Low (°F)
Jan 50.2 47.5 44.2
Feb 49.8 46.8 43.6
Mar 50.8 47.4 44.3
Apr 54 49.9 46.5
May 57.7 53.4 50
Jun 62.4 57.7 54
Jul 65.8 60.8 57.1
Aug 65.6 60.9 57.5
Sep 63.2 59.1 55.9
Oct 59.7 56.3 53.3
Nov 54.6 51.9 48.8
Dec 51.2 48.8 45.6

Show Celsius

Month Avg. High (°C) Avg. Mean (°C) Avg. Low (°C)
Jan 10.1 8.6 6.8
Feb 9.9 8.2 6.4
Mar 10.4 8.6 6.8
Apr 12.2 9.9 8.1
May 14.3 11.9 10
Jun 16.9 14.3 12.2
Jul 18.8 16 13.9
Aug 18.7 16.1 14.2
Sep 17.3 15.1 13.3
Oct 15.4 13.5 11.8
Nov 12.6 11.1 9.3
Dec 10.7 9.3 7.6

 


 

Precipitation (Rain or Snow)

If dry weather is what you’re after, the months with the lowest chance of significant precipitation in Isles of Scilly are September, June, and then April. Note that we define “significant precipitation” as .1 inches or more in this section. The lowest chance of rain or snow occurs around mid April. For example, on the week of April 16th there is 1 day of precipitation on average. By contrast, it’s most likely to rain or snow in mid January with an average of 4 days of significant precipitation the week of January 15th.

When can you find snow in Isles of Scilly? Weather stations report no annual snow. Please note that a value of 0 for snow in the graph below may either mean there was no snow, or that snow is unreported.

Chance of Precipitation

The graph below shows the % chance of rainy and snowy days in Isles of Scilly.

Key
Days with precipitation

Snow on the Ground

The graph below shows the average snow on the ground in Isles of Scilly (in).

Key
Snow depth

Average Rain and Snow by Month

Show Inches

Month Daily Chance of Rain Average Snow Depth (in) Total Precipitation (in)
Jan 37% 0 4.3
Feb 33% 0 3.3
Mar 21% 0 2.4
Apr 19% 0 2.4
May 20% 0 2.2
Jun 18% 0 2
Jul 27% 0 3.8
Aug 25% 0 3.3
Sep 14% 0 2
Oct 26% 0 3.5
Nov 32% 0 3.9
Dec 35% 0 3.6

Show Centimeters

Month Daily Chance of Rain Average Snow Depth (cm) Total Precipitation (cm)
Jan 37 0 10.9
Feb 33 0 8.4
Mar 21 0 6.1
Apr 19 0 6.1
May 20 0 5.6
Jun 18 0 5.1
Jul 27 0 9.7
Aug 25 0 8.4
Sep 14 0 5.1
Oct 26 0 8.9
Nov 32 0 9.9
Dec 35 0 9.1

 

Humidity and Wind

Isles of Scilly has some extremely humid months, and high humidity throughout the year. The least humid month is December (74.8% relative humidity), and the most humid month is June (82.5%).

Wind in Isles of Scilly is usually stronger than many places. The windiest month is December, followed by January and November. December’s average wind speed of around 18 knots (20.7 MPH or 33.2 KPH) is considered “a fresh breeze.” Maximum sustained winds (the highest speed for the day lasting more than a few moments) are at their highest in late December where average top sustained speeds reach 28.6 knots, which is considered high wind or moderate gale winds.

Relative Humidity (%)

The graph below shows the average % humidity by month in Isles of Scilly.

Key
Avg. Relative Humidity

Wind

The graph below shows wind speed (max and average) in knots.

Key
Max Sustained Wind
Average Daily Wind

Average Wind Speeds

Show Wind Speeds

All wind speeds are in knots. 1 knot = 1.15 MPH or 1.85 KPH.

Month Avg. Wind Avg. Wind Feel Sustained High Wind High Wind Feel
Jan 16.7 Significant breeze 24.7 Very strong breeze
Feb 15.6 Significant breeze 23.3 Very strong breeze
Mar 14.5 Significant breeze 21.2 Very strong breeze
Apr 12.8 Significant breeze 19 Strong breeze
May 12.4 Significant breeze 18.2 Very strong breeze
Jun 11.6 Significant breeze 17.2 Strong breeze
Jul 11.5 Significant breeze 16.8 Very strong breeze
Aug 11.5 Significant breeze 17.3 Strong breeze
Sep 11.5 Significant breeze 17.1 Very strong breeze
Oct 13.3 Significant breeze 20.1 Strong breeze
Nov 15.6 Significant breeze 23 Very strong breeze
Dec 18 Strong breeze 25.6 Very strong breeze

Show Relative Humidity by Month

Month Avg. Relative Humidity
Jan 76.3%
Feb 75.8%
Mar 77.7%
Apr 80.2%
May 81.9%
Jun 82.5%
Jul 81.7%
Aug 81.2%
Sep 81.3%
Oct 80%
Nov 76.8%
Dec 74.8%

 

Is it Safe to Travel to Isles of Scilly?

Our best data indicates this area is somewhat safe. As of Oct 07, 2019 there are travel warnings for the United Kingdom; exercise a high degree of caution. Check this page for any recent changes or regions to avoid: Travel Advice and Advisories. This advisory was last updated on Sep 06, 2019.


 

The Busiest and Least Crowded Months

The busiest month for tourism in Isles of Scilly, the United Kingdom is July, followed by May and September. Prices for hotels and flights will be most expensive during these months, though you can save if you purchase well in advance. Tourists are unlikely to visit Isles of Scilly in November. Those willing to visit at these times will likely find it the least expensive month.

Estimated Tourism by Month

 

Most Popular Months to Visit

Key
Tourists Seeking Accommodations

Tourism graph is based on Google searches for services used by tourists relative to the rest of the year. Tourism data for this area is extrapolated based on nearby areas. Displayed data is calculated relative to the peak, so a score of 39.7 in November means 39.7% of the tourists vs. July.

 

 

Overall Isles of Scilly Travel Experience by Season

Spring (March through May)

Humidity and temperatures combine to make this season feel moderately cold. Highs range from 60.4°F (15.8°C) and 49.8°F (9.9°C) with warmer temperatures in the later months. Rain is somewhat common with roughly 6 days of significant precipitation per month. Spring is the second busiest for tourism, which makes it a good time for those looking for things to do.

Summer (June through August)

The middle-year months have comfortably cool weather with high temperatures that are comfortable. These months see moderate precipitation with 5 to 8 days of precipitation per month. June – August is the busiest season for tourism in Isles of Scilly, so lodging and other accommodations may cost more than usual.

Fall (September through November)

Fall daily highs range from 63.9°F (17.7°C) and 51.5°F (10.8°C), which will feel comfortable given the humidity and wind. It rains or snows a significant amount: 4 to 9 days per month. Tourism is the slowest during these months due to the weather, so hotels may be affordably priced.

Winter (December through February)

Weather is too cold this time of year in Isles of Scilly to be enjoyable for warm weather travelers. The average high during this season is between 51.8°F (11°C) and 48.6°F (9.2°C). On average, it rains or snows a great amount: 9 to 11 times per month. These times of year are fairly slow with tourists.

 

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