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Live forecasts update automatically; written guidance last reviewed 16 June 2026 by the Public Report weather desk. Data from national met services via Open-Meteo.
Live data from Open-Meteo · updates automatically ·
The live forecast above shows current conditions over the Isles of Scilly, where mild, maritime air prevails. Daytime highs typically range 8–12°C in winter and 16–20°C in summer, with frequent cloud cover and moderate south-westerly winds bringing occasional rain.
What is the climate like on the Isles of Scilly?
The islands enjoy a temperate oceanic climate, heavily moderated by the surrounding Atlantic. Annual rainfall averages around 800–900 mm, spread fairly evenly across the year, though autumn and winter tend to be wetter. Sunshine hours are modest, averaging 1,500–1,600 hours annually, with May and June the sunniest months. Wind speeds frequently reach 15–20 mph, especially between October and March.
For those checking isles of scilly weather by month, the warmest period is July to September, with sea temperatures peaking near 16°C. Conversely, December and January are coolest, with occasional frost but very rare snow.
When is the best time to visit?
Late spring (April–June) offers the best balance of mild temperatures, lower rainfall and longer daylight. July and August are busiest but still pleasant, with daytime highs near 19°C. If you are planning a trip for isles of scilly weather august, expect average highs around 18–20°C and sea breezes. For isles of scilly weather september, conditions remain mild, though rainfall begins to increase. Winter visitors should prepare for wind and rain; isles of scilly weather december averages 5–9°C and short days.
Does it rain a lot on the Isles of Scilly?
Rainfall is moderate – roughly 850 mm per year – but it falls on about 150 days, often as light showers. The wettest months are October to January, while April to June are noticeably drier.
Is the Isles of Scilly very windy?
Yes, especially from October to March when south-westerly gales are common. Average wind speeds are 15–20 mph, but summer months are calmer, with lighter breezes and less frequent strong winds.
What is the sea temperature like in summer?
Sea temperatures peak in August and September at around 16–17°C, suitable for swimming with a wetsuit. In winter they drop to 9–10°C, too cold for most open-water activities without thermal protection.
Sources
For a broader outlook, visit the UK weather hub or check the 10-day weather forecast for other regions. Those planning ahead may also want to review isles of scilly weather march, isles of scilly weather october, and isles of scilly weather in summer for seasonal trends.