Home › Weather › Isles Of Scilly Weather
Live forecasts update automatically; written guidance last reviewed 20 June 2026 by the Media Grid UK weather desk. Data from national met services via Open-Meteo.
Live data from Open-Meteo · updates automatically ·
Check the live forecast above for today’s wind and rain; the Isles of Scilly typically see 12–15 °C in summer and 5–9 °C in winter, with sudden Atlantic fronts a key factor in any day’s planning.
What is the typical climate across the year?
The islands experience a mild oceanic climate, so extremes are rare. Mean daytime highs range from 8 °C in January to 19 °C in August. Sea temperatures lag behind air temperatures, peaking at around 16 °C in September. Rainfall is spread fairly evenly, with October to January slightly wetter and May to July drier. Sunshine hours are modest – about 1,600 hours annually – with May and June the sunniest months.
For month-by-month expectations, see our 10‑day forecast for the UK or check conditions for nearby Bristol.
How do spring and autumn differ?
Spring (March–May) sees slow warming from 9 °C to 14 °C, with March often still cool and breezy. Autumn (September–November) stays mild – September averages 17 °C, dropping to 12 °C by November – but Atlantic lows become more frequent. September and October are popular for settled spells, while December can bring gales and 8–10 °C daytime highs.
Isles of Scilly weather by month – where can I see a full breakdown?
The live forecast above gives the short-term outlook. For monthly averages, the Met Office’s climate data for St Mary’s is the best source. In summary: January is coolest, July is warmest, and September often has the most settled sea conditions.
Isles of Scilly weather in summer – what should I pack?
Summer (June–August) brings highs of 16–19 °C, but low 20s occur occasionally. Even on sunny days a windproof jacket is wise because Atlantic breezes are constant. Light layers plus a waterproof top work well.
Isles of Scilly weather 14 days – is that outlook reliable?
A 14‑day forecast on the Scillies is a guide, not a certainty. Atlantic weather systems shift quickly, so accuracy drops after about day 7. Use the live forecast above for the closest update, and check the 10‑day UK forecast for trends.