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Live forecasts update automatically; written guidance last reviewed 16 June 2026 by the Civic Insight weather desk. Data from national met services via Open-Meteo.
Live data from Open-Meteo · updates automatically ·
The Isles of Scilly, an archipelago 28 miles off Cornwall’s coast, are currently seeing the mild, changeable maritime pattern shown in the live forecast above, with conditions shifting quickly between Atlantic showers and brief sunny spells.
What is the typical weather pattern across the year?
The islands enjoy a notably temperate climate. Isles of Scilly weather by month shows winter highs rarely below 8°C and summer highs peaking around 19°C. Spring and autumn are mild, with Isles of Scilly weather March often bringing calm, bright days while Isles of Scilly weather October can be unsettled with Atlantic fronts. The sea keeps frost rare.
How does summer and autumn differ?
Isles of Scilly weather in summer – June to August – offers the most reliable sunshine, though sea fog can roll in. Isles of Scilly weather August averages 18–19°C and is the peak visitor month. Isles of Scilly weather September stays warm (16–18°C) with fewer crowds. By Isles of Scilly weather December gales are more frequent, and Isles of Scilly weather 14 days forecasts should be checked before travelling, as ferry and air services are sensitive to wind.
When is the best time to visit the Isles of Scilly?
Late spring (May) and early autumn (September) offer mild temperatures, fewer crowds, and lower wind risk. Summer is sunniest but busiest. Winter can bring ferry cancellations.
Does it rain a lot in Scilly?
Rainfall is moderate at around 900 mm annually – less than mainland Cornwall. Showers are often short and followed by bright intervals. Isles of Scilly weather March tends to be drier than December.
Is the wind worse than on the mainland?
Yes. Exposed to Atlantic gales, especially from October to February. Isles of Scilly weather 14 days forecasts are essential for planning travel, as strong winds can disrupt flights and boats.
For the wider picture, see our UK weather hub or compare with Bristol Weather. For longer-range planning, the 10 Day Weather Forecast UK page includes Scilly.