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Live forecasts update automatically; written guidance last reviewed 16 June 2026 by the DailyCity weather desk. Data from national met services via Open-Meteo.
Saint Mary’s Island, the main inhabited island of the Isles of Scilly off Cornwall’s coast, sees typical Atlantic maritime weather today: the live forecast above shows a cloudy start with bright spells developing, a moderate southwesterly breeze, and temperatures holding near seasonal averages for this exposed location.
What’s the outlook for Saint Mary’s this week?
The week ahead on Saint Mary’s follows a familiar Scilly pattern – alternating bands of cloud and clearer intervals as Atlantic systems drift east. Westerly winds remain moderate to fresh, keeping the air mild but often damp. Sea fog may briefly reduce visibility near the coast, especially overnight. The live forecast above provides rolling updates for the island’s specific microclimate.
How does the Atlantic affect St Mary’s weather?
Sitting 28 miles off Land’s End, Saint Mary’s experiences a strongly maritime climate – mild winters, cool summers, and rainfall spread through the year. The Gulf Stream influence keeps temperatures less extreme than mainland Cornwall, but the island is more exposed to gales and low cloud. Check the live forecast above before heading out, as conditions can change swiftly.
When is the driest month on Saint Mary’s Island?
Generally May and June see the lowest rainfall in the Isles of Scilly, with roughly 40–50mm per month. However, the Atlantic keeps conditions changeable, so no month is reliably dry – always check the live forecast above for the immediate outlook.
Does St Mary’s often get fog?
Yes, sea fog (haar) can roll in from the Atlantic, especially in spring and summer when warmer air passes over cooler waters. It may reduce visibility to a few hundred metres for hours at a time, affecting flights to the island.
Is the wind on St Mary’s strong enough to disrupt ferries?
Frequently. Southwesterly gales (force 7 or more) can cancel the Scillonian ferry crossing from Penzance. The live forecast above includes wind details; passengers should check before travelling.
Sources
For a wider view of conditions, see our UK weather hub and the 10 Day Weather Forecast UK. Forecasts for weather st marys isles of scilly, met office weather isles of scilly, and bbc weather st mary’s scilly are all reflected in the live forecast above.