15/07/2026 – Weather in Cornwall

Thunderstorms could fringe south Cornwall as heat holds near 30°C

If you have outdoor plans in the south of Cornwall this week, keep half an eye on the sky. Most of the county is in for hot, hazy sunshine over the next few days, but the far south carries a small risk of showers and the odd thunderstorm before things settle down for the weekend.

What today holds

Higher cloud is making the sunshine hazy at times across Cornwall today, and there is a chance of showers and isolated thunderstorms across the south of the county and into Devon. It stays breezy around the coasts. Temperatures across the region climb to a maximum of 30°C.

So if you are heading to a beach on the south coast, the odd sharp downpour is possible even while the rest of the day feels hot.

A warm night to follow

Any showers in the far south mostly fade this evening to leave a largely dry night with clear spells and variable cloud. The winds steadily ease off. It stays warm overnight, with the temperature dropping no lower than 17°C.

Thursday keeps a small risk in the south

Further showers and the odd thunderstorm could fringe the far south of the county on Thursday. Many other areas stay dry with bright or sunny spells, and it feels hot where the sunshine lasts, particularly further east. The regional maximum again reaches 30°C.

The weekend settles down

From Friday through to Sunday it turns largely dry and settled. There are further sunny spells, though cloud amounts generally increase as the weekend goes on. Temperatures slowly drop back, but it still feels warm wherever the sun breaks through.

The headline for the week is a simple one: a chance of a few showers, but no substantial rainfall expected.