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Climate - Scilly (England)


Average weather, temperature, rainfall, sunshine hours

Flag - England

Scilly, where it's located


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Climate chart - Scilly
The climate of the Isles of Scilly is oceanic, with quite mild, rainy winters and mild, relatively rainy summers.
The islands are located south-west of the south-western tip of Great Britain (Cornwall). The main islands are St. Mary's, Tresco, St. Martin's, St. Agnes and Bryher.
With an average annual temperature close to 12 °C (53 °F), the Isles of Scilly are the mildest place in Great Britain, especially thanks to the particularly high winter temperatures. The average of 8 °C (46 °F) in January exceeds that of Plymouth (in Devon), where it is 6.5 °C (44 °F), and that of the south coast of England (see Eastbourne, Brighton) where it is around 5.5 °C (42 °F).
Winter is mild enough, although the sky is often cloudy, the humidity is high and there are periods when the wind blows moderate or strong. The rains are frequent.
The islands are quite sheltered from the cold waves that can sometimes affect Great Britain, in fact, snow is rare, and frosts are even more so. On the coldest nights of the year, the temperature typically drops to around 0 °C (32 °F). In March 2018, it dropped to -2 °C (28.5 °F). The only real wave of frost in recent decades was that of January 1987, when the temperature dropped to -7 °C (19.5 °F) and 23 cm (9 in) of snow fell.
In summer, temperatures are generally mild or cool. It can also rain, albeit a little less often than in winter.
Hot days are very rare. Generally, the temperature reaches 22/24 °C (72/75 °F) on the warmest days of the year. The highest record is just 28 °C (82 °F).

Scilly

Best Time


The best time to visit the Isles of Scilly is the summer, or more generally from mid-May to mid-September: temperatures are generally good for outdoors activities, although it's better to bring an umbrella, and a sweatshirt or sweater for the evening or for cool days.

Scilly - Climate data


In Scilly, the average temperature of the coldest month (February) is of 8.1 °C (46.6 °F), that of the warmest month (August) is of 17 °C (62.6 °F). Here are the average temperatures.
Scilly - Average temperatures (1991-2020)
MonthMin (°C)Max (°C)Mean (°C)Min (°F)Max (°F)Mean (°F)
January6108.2445046.7
February6108.1435046.6
March7118.8445247.8
April81310465550.1
May101512.1495853.8
June121714.6546358.3
July141916.6576761.8
August142017586762.6
September131815.7566560.3
October111512.9515955.3
November91210.4485450.8
December7118.9455148
Year9.714.211.9549.557.653.5

In Scilly, precipitation amounts to 880 millimeters (34.6 inches) per year: so, it is at an intermediate level. It ranges from 50 mm (2 in) in the driest months (April, May, June) to 100 mm (3.9 in) in the wettest ones (November, December) Here is the average precipitation.
Scilly - Average precipitation
MonthMillimetersInchesDays
January953.715
February75313
March552.212
April50210
May5029
June5029
July702.89
August75310
September702.810
October903.514
November1003.916
December1003.916
Year88034.6142

At Scilly, the sea temperature ranges from 10 °C (50 °F) in March to 17 °C (63 °F) in August, September. Here are the average sea temperatures.
Scilly - Sea temperature
MonthCelsius (°C)Fahrenheit (°F)
January10.551
February10.551
March1050
April1151
May1254
June1458
July16.562
August1763
September1762
October1559
November13.556
December1253
Year13.355.9

In Scilly, there are on average around 1710 sunshine hours per year. Here are the average hours of sunshine per day.
Scilly - Sunshine hours
MonthAverageTotal
January260
February385
March4130
April6.5195
May7220
June7210
July6.5205
August6.5195
September5.5165
October4115
November2.570
December1.550
Year4.71710

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