09/07/2026 – Weather in Cornwall

Cornwall Set for 35°C Friday as July Heat Builds

If you have outdoor plans in Cornwall over the next few days, get ready to feel the heat. The latest South West forecast points to a run of strong July sunshine, with temperatures climbing towards the mid-30s before the weekend and staying warm well into the nights.

Thursday starts foggy, then turns fine

Morning low cloud and fog will clear quickly to leave a fine and sunny day. Some fog may linger offshore and lap onto coastal stretches at times, so parts of the coast could stay grey for longer than inland spots. Winds stay light and it will feel very warm in the sunshine. The maximum temperature is expected to reach 33°C.

A warm night, with mist returning

The evening stays warm and sunny, and skies remain clear overnight. There is a risk of mist and fog patches forming again as the night goes on. For most people it will be a warm night, with the temperature dropping no lower than 14°C.

Friday is the hottest day

Any early fog clears to leave a hot and sunny day across the region. Winds stay light and UV levels will be high. This is the peak of the spell, with the maximum temperature reaching 35°C. The warmth carries on into a very warm Friday evening and night.

The weekend and into Monday

Plenty of sunshine continues through Saturday and Sunday. The wind picks up a little, which may take the edge off the heat and make it feel not quite as hot for most. Nights stay warm throughout. A few showers may arrive by Monday.