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Live forecasts update automatically; written guidance last reviewed 16 June 2026 by the Daily Press UK weather desk. Data from national met services via Open-Meteo.
Live data from Open-Meteo · updates automatically ·
The Isles of Scilly enjoy a mild maritime climate, with average highs ranging from 8°C in winter to 19°C in summer. The live forecast above shows current conditions; for planning, summer months are warmest and driest, while autumn brings more rain but still mild temperatures.
What is the typical weather pattern on the Isles of Scilly?
The islands benefit from the Gulf Stream, giving them one of the mildest climates in the UK. Winters are cool but rarely frosty, with average lows around 5°C in December and January. Rainfall is spread fairly evenly, though October to January tend to be wettest. Spring (March to May) sees increasing sunshine and moderate temperatures, while summer (June to August) is consistently warm but rarely hot. For those looking at isles of scilly weather by month, May often offers the most sunshine, and September retains summer warmth with fewer crowds.
When is the best time to visit?
For the warmest conditions, July and August are ideal, with average highs near 19°C and long daylight hours. If you prefer quieter visits, consider May, June or September – these months still offer pleasant weather. Spring and autumn are also excellent for walking and wildlife, with isles of scilly weather in summer being the peak season for beachgoers. For winter trips, isles of scilly weather december remains mild compared to mainland UK, though rain and wind are more likely.
Is Isles of Scilly weather similar to Cornwall?
Yes, but the islands are even milder and less prone to frost due to the surrounding sea. Winter temperatures are usually a degree or two warmer than mainland Cornwall, and summer highs are slightly cooler.
What is the weather like in September?
September remains warm, with average highs around 17°C and lower rainfall than October. It is a popular month for isles of scilly weather september, offering a good balance of settled conditions and quieter beaches.
How reliable are 14-day forecasts for the islands?
Longer-range forecasts like isles of scilly weather 14 days can indicate general trends, but local conditions change quickly. Always check the live forecast and Met Office updates closer to your trip for accurate planning.
Sources
For more UK conditions, see our UK weather hub or check the 10 Day Weather Forecast UK. If you are travelling from the mainland, Bristol Weather can give a useful comparison for the south-west route.