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Live forecasts update automatically; written guidance last reviewed 16 June 2026 by the Reading Wire weather desk. Data from national met services via Open-Meteo.
Live data from Open-Meteo · updates automatically ·
Check the live forecast above before heading out this week — Cornwall’s coastal weather can shift quickly, with sea breezes and Atlantic fronts influencing conditions from Penzance to St Ives.
What should you expect from Cornwall’s weather today?
The live forecast above gives the most up-to-date picture for your chosen location, but remember that Cornwall often experiences its own microclimates. The north coast tends to be breezier and cooler, while the south coast catches more shelter from the land. If you’re planning a day on the beach or a coastal walk, check the wind direction and tide times too – they can make a real difference to your comfort and safety.
How does Cornwall’s geography affect its climate?
Cornwall juts out into the Atlantic, so it receives the full force of south-westerly winds and frequent cloud bands. This maritime influence keeps temperatures mild in winter but can bring persistent drizzle, especially on higher ground like Bodmin Moor. The county also enjoys more sunshine than many other UK regions, thanks to its southerly latitude – though fog can roll in suddenly along the coast during spring and autumn.
When is the best time to visit Cornwall for good weather?
Late spring (May–June) and early autumn (September) often offer the best balance of sunshine, warmth and fewer crowds. July and August can be busier and occasionally hit by Atlantic low-pressure systems.
Is the sea warm enough for swimming in Cornwall?
Sea temperatures peak around 16–18 °C in August and September. Many visitors find that comfortable with a wetsuit, while hardy locals swim year-round – even in winter when water drops to 9–10 °C.
Does Cornwall get a lot of fog?
Sea fog, known locally as ‘fret’ or ‘haar’, can form when warm air passes over cooler water. It’s most common in spring and early summer, often burning off by midday. The south coast is slightly more prone than the north.
For a broader picture of conditions across the country, visit our UK weather hub or check the 10 day weather forecast for your area.