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Live forecasts update automatically; written guidance last reviewed 20 June 2026 by the Culture Observer weather desk. Data from national met services via Open-Meteo.
Live data from Open-Meteo · updates automatically ·
Cornwall’s weather is famously mild but changeable, with the Gulf Stream keeping winters warmer and summers cooler than the rest of the UK. The live forecast above shows the immediate outlook, but for a true sense of what to expect, the pattern of low pressure from the Atlantic means you can see four seasons in a single day.
When is the best time to visit Cornwall for weather?
The sunniest months are May, June and September, when crowds ease off and temperatures hover between 15–20°C. July and August are busiest with school holidays and the highest chance of 20°C-plus days, though sea fog (especially around Newquay) can roll in. For surf-friendly conditions and fewer people, autumn brings consistent Atlantic swells and mild days.
What should you pack for Cornwall’s weather?
Layers are non-negotiable: a waterproof jacket and sturdy walking shoes serve year-round. Even in summer, the coastal breeze can feel sharp, so a fleece or light jumper is wise. For winter visits, pack a warm coat and hat – those “feels like” temperatures drop quickly after dark.
Is Cornwall’s weather reliable for a 10-day trip?
No. The met office 10-day outlook offers a general trend, but Atlantic systems shift fast. Use the cornwall weather bbc forecast for daily updates and check the weather in cornwall 10 days model before packing. Always expect rain – even in summer.
What does a weather warning in Cornwall actually mean?
Met Office warnings (yellow, amber, red) signal disruption risk, typically from coastal gales, heavy rain or snow on high ground. A cornwall weather warning today often affects travel on the A30 and branch lines. Check Gov.uk for road updates.
How accurate is the 21-day weather forecast for Cornwall?
Low confidence. The 21 day weather forecast cornwall gives a broad pattern – generally mild and unsettled – but specifics beyond 10 days are unreliable. For planning coastal walks, rely on the cornwall weather 14 days forecast and the live forecast above.
For more coastal forecasts, see our UK weather hub, compare with Bbc Wales Weather or explore Lake District Weather for similar Atlantic influences. A cornwall weather map is useful for spotting localised rain bands, especially between Newquay and St Ives.