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Cornwall weather: Thursday 27 August, thundery bank holiday ahead

Published On: 27 August 2026Last Updated: 27 August 2026By
CornishStuff Cornwall weather collage of lightning, cloud and sunshine

If this morning’s downpour had you reaching for the waterproofs, hold on. The Met Office reckons the wet start washes through and brighter skies push up from the south, and today is the calmer half of an unsettled, possibly thundery bank holiday stretch. Here is how the Cornwall weather looks from now through to Monday, taken from the Met Office regional forecast for the South West.

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Today

A wet start, but it does not last. Drier, brighter conditions move in from the south through the morning, the cloud lifts and some bright spells break through. A few showers are possible in the afternoon, though most places stay dry. The top temperature reaches 23°C.

Tonight

A mostly dry start to the evening, before a few showers develop across Devon and Cornwall in the early hours. It stays mild for everyone, with the temperature no lower than 13°C.

Friday

The respite is brief. Heavy rain moves into the west through Friday morning, with isolated showers elsewhere, then the rain spreads eastwards and brings the risk of heavy downpours. Despite the wet, it stays warm at up to 23°C.

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The bank holiday weekend

An unsettled bank holiday weekend is on the cards from Saturday through Monday, with showers and possibly some thunder in the mix. It stays warm to begin with, then turns fresher as the wind swings round to a westerly by Monday.

Warm to start, fresher by Monday, and a rumble of thunder not ruled out in between. The bank holiday is one to keep half an eye on the sky for.

CornishStuff Cornwall weather collage of lightning, cloud and sunshine

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