Weather In Scilly


seaWeather in Scilly is a significant concern as a holiday in Scilly is best appreciated out in the open air. The Islands boast amongst the mildest and warmest climate in the UK with a small variation between day and night temperatures. Often referred to as the sunshine isles, they benefit from more hours of sunshine than other regions - averaging 7.6 hours a day in July. However it is always comfortable and rarely muggy or humid due to the sea breeze.

The UV index in Scilly is generally higher than the mainland as there is little air pollution and this makes the air clarity high. For example, on a day in August when the temperature was 16c and the forecast sunny both in London and in Scilly, the UV index rating in London was 3 and in Scilly 7. (It generally does not exceed 8 in the UK). You may find you burn quickly and more easily so please use sun protection!

flowerScilly has an early spring which means the flowers bloom early. It is very rare to have a frost in Scilly, and it has snowed only a handful of times in the last 25 years. Inclement weather in Scilly generally comes in the form of gale force winds in the winter months as the islands are unprotected in their isolated position in the Atlantic Ocean. Scilly is particularly pleasant between May and September and the majority of visitors chose this period for holidaying, however the Easter holidays and October half term have often been very reasonable so the islands still provide a terrific destination for family holidays. The sea temperature is between 8c and 16c throughout the year.

Because of the islands unique location we can sometimes experience fog. Fog affects flying approximately 16 days a year and the insurance companny will pay for each completed 12 hour delay.

Month Jan Feb Mar April May June July Aug Sept Oct Nov Dec
Average High 9C 9C 11C 12C 14C 17C 19C 19C 18C 15C 12C 10C
Average Low 6C 6C 7C 7C 9C 12C 13C 14C 13C 11C 9C 7C
Average Rainfall 91mm 71mm 69mm 46mm 56mm 49mm 61mm 64mm 67mm 80mm 96mm 94mm
Average Days of rainfall 22 17 16 13 14 14 16 15 16 17 19 21
Average Hours of Sunshine 61 83 135 186 229 229 238 235 164 121 77 57

Good websites links for Isles of Scilly forecasts are:

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