Weather Saint Mary’s Island
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Live forecasts update automatically; written guidance last reviewed 16 June 2026 by the Leeds Wire weather desk. Data from national met services via Open-Meteo.
Saint Mary’s Island (Isles of Scilly) has a mild, changeable maritime climate today, with a mix of sunshine and scattered showers. The live forecast above shows the current conditions, but expect breezy intervals and cooler temperatures than inland Cornwall.
What will the weather be like today on Saint Mary’s?
The day starts with cloud and a few light showers, clearing to brighter spells by midday. Winds are moderate from the south-west, gusting around 20 mph near the coast. Sea temperatures remain around 12°C, keeping the air cool even when the sun appears. Rain returns by evening, so take a waterproof jacket if heading out.
How does the sea affect the forecast?
Being surrounded by the Atlantic, Saint Mary’s experiences less temperature variation than mainland UK. The sea breeze can strengthen in the afternoon, and fog patches sometimes roll in overnight. Tides are large this week, so check times before walking on exposed beaches. The Met Office weather for the Isles of Scilly often updates hourly due to these local effects.
Is Saint Mary’s Island much windier than the mainland?
Yes, it’s often windier because the island faces the open Atlantic. Average wind speeds are 5–10 mph higher than in Penzance, especially in autumn and winter. Check the BBC weather for St Mary’s Scilly before planning outdoor activities.
Does the fog affect travel to the Isles of Scilly?
Fog can reduce visibility for flights and ferry crossings, particularly in spring and early summer. Always check the Met Office weather for the Isles of Scilly before travelling. Delays are rare but possible when sea fog lingers.
What’s the best month for settled weather on Saint Mary’s?
May to July are generally the driest and sunniest months, with average highs of 17–19°C. However, even in summer be ready for changeable conditions – the weather st Marys Isles of Scilly can switch from calm to breezy in an hour.
Sources
For more UK forecasts, visit our weather hub or check the 10-day forecast for other locations.
