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Thanks to the mild Gulf Stream, the archipelago of the Isles of Scilly enjoy a pleasant temperate climate, ice and snow are extremely rare events in the archipelago. The Isles of Scilly probably enjoy the mildest climate in the whole of the United Kingdom, their southern position and off the coast of Cornwall guarantee a mild climate in winter and summer without the excess temperatures present in other regions of the country.
The temperatures of the Isles of Scilly are mild and suffer small seasonal variations, the average maximum temperatures vary between 19.7 ° C in August, the hottest month, and 9.7 ° C in February, the coldest month, while the temperatures minimum averages vary between 14.1 ° C in August, the hottest month, and 6.0 ° C in February, the coldest month. The ice days are on average only 2 per year. The sunny hours are 1,689 per year, May is the month with the most sunshine, on average 218 hours.
The rains on the Isles of Scilly are more abundant in the winter and autumn months, i.e. those between October and February. The rainy days in the archipelago are on average 138 per year. The month with the most rainy days is December with 15 days of rain, while the month with the least rainy days is June with only 7 days.
The sea water temperature of the Isles of Scilly in the summer months – that is between July and September – varies between 16 ° C and 18 ° C.
WHEN TO GO TO SCILLY ISLANDS
The best time to visit the Isles of Scilly is the mildest and sunniest one from May to September.
THE CLIMATE OF THE ISLES OF SCILLY: CLIMATE TABLES
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| ISLES OF SCILLY (35 meters) | ||||
| Month | Average low (°C) | Average high (°C) | Precip. (mm) | Precip. days |
| January | 6,2 | 9,7 | 94,8 | 15,5 |
| February | 6,0 | 9,7 | 69,7 | 13,0 |
| March | 6,7 | 10,8 | 61,7 | 11,5 |
| April | 7,2 | 12,3 | 54,6 | 10,4 |
| May | 9,4 | 14,5 | 47,8 | 8,5 |
| June | 11,9 | 17,1 | 47,8 | 6,9 |
| July | 13,8 | 19,2 | 63,4 | 8,9 |
| August | 14,1 | 19,7 | 67,2 | 9,7 |
| September | 12,9 | 18,0 | 67,4 | 10,2 |
| October | 10,6 | 14,7 | 96,6 | 14,4 |
| November | 8,5 | 12,1 | 95,9 | 14,9 |
| December | 6,9 | 10,4 | 98,2 | 15,2 |
| YEAR | 9,5 | 14,0 | 865,1 | 138,1 |
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