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Live forecasts update automatically; written guidance last reviewed 16 June 2026 by the Trade Wire UK weather desk. Data from national met services via Open-Meteo.
Live data from Open-Meteo · updates automatically ·
The Isles of Scilly currently enjoy a mild, maritime climate, with the live forecast above showing conditions typical for this time of year. Expect changeable skies and a gentle breeze, as the islands sit in the path of Atlantic weather systems.
What is the weather like on the Isles of Scilly throughout the year?
The Scillies benefit from one of the mildest climates in the UK, thanks to the warming influence of the Gulf Stream. Winters are cool but rarely frosty, while summers stay pleasantly warm without becoming too hot. For those planning ahead, the isles of scilly weather by month shows a clear pattern: spring and autumn are often the most settled, with fewer storms than the deep winter months.
When is the best time to visit for good weather?
If you’re after warmth and longer days, the isles of scilly weather in summer (June to August) offers average highs around 18–20°C, with July and August being the driest. The isles of scilly weather september and isles of scilly weather october remain mild, often with calm seas and clear spells, making them a favourite for walkers. Conversely, the isles of scilly weather december and isles of scilly weather march can be windier and wetter, though still far milder than mainland Britain.
Does it ever snow on the Isles of Scilly?
Snow is extremely rare. The maritime air keeps temperatures above freezing almost all year, so you are far more likely to see rain or drizzle than any settled snow.
How accurate are 14-day forecasts for the Scillies?
For the isles of scilly weather 14 days, treat long-range forecasts as a general trend. The islands’ exposed position means conditions can shift quickly, so check the live forecast above for the most reliable outlook.
Is the water warm enough to swim in summer?
Sea temperatures peak around 16–17°C in August and September. Many visitors do swim, but a wetsuit is recommended for comfort, especially outside the warmest weeks.
Sources
For a broader look at conditions across the country, visit our UK weather hub or check the 10 day weather forecast UK for your area. If you are comparing mainland conditions, our Bristol Weather page offers a useful contrast to the Scillies’ milder climate.