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Live forecasts update automatically; written guidance last reviewed 20 June 2026 by the Culture Observer 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 less rainfall than mainland Cornwall and rare frosts. Best visited April–October when temperatures hover around 17–20°C, though sea breezes keep it cooler. Layering and waterproofs are essential year-round.
When is the best time to visit the Isles of Scilly?
Late spring and early autumn offer the most settled weather. May and June typically see the most sunshine, while September and October remain warm enough for walking and wildlife, with fewer crowds. Summer (June–August) is peak season, but sea fog can sometimes drift in.
What should I pack for the Isles of Scilly?
Given the changeable conditions, pack a waterproof jacket and sturdy footwear for coastal paths. Even in summer, a fleece or mid-layer is advisable. Suncream and a hat are sensible for brighter spells, and insect repellent can help in calm, damp conditions.
Does it rain a lot on the Isles of Scilly?
No, the islands are among the driest parts of the UK, with around 800mm of rain annually. Rain is usually light and intermittent, though it can be persistent in winter. The live forecast above shows the immediate outlook.
When are school holidays and how do they affect the weather?
School holidays fall in April, late May, late July–August and October. Weather in July–August is warmest but often busiest; April and October can be cooler, with more chance of wind. Book accommodation early for summer.
Is the sea warm enough for swimming?
Summer sea temperatures peak around 16–18°C in August – refreshing rather than warm. Wetsuits are common. May and September can be comfortable for short dips on calm days. In winter the sea stays above 9°C.
For broader UK conditions, visit our UK weather hub or check 10-day forecasts for islands like Scilly. Those planning a trip might also compare conditions with Bristol Weather for a mainland reference.