The Met Office says as much as 10cm of rain could fall in an area between the Devon city of Exeter and the Somerset town of Taunton across Sunday.

It comes as a yellow weather warning has been issued for large parts of the UK, with much of southern England and South Wales set for "severe" thunderstorms.

The yellow alert warning is for London, as well as the south and the east of England. It is set to be in place from 1pm on Sunday, until 6am on Monday.

Another yellow alert is in place, warning of heavy rain and thunderstorms for the southwest of England and South Wales throughout Sunday.

Forecasters have warned of a small chance of flooding, with the potential for disruption to travel in the areas covered by the earlier weather warning.

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Forecasters are also predicting a wet and windy end to the UK's short-lived September heatwave, with a spell of dreary weather expected for much of the UK next week.

There will be further heavy and thundery showers on Monday, although the weather will turn drier and fresher from the west into the evening, forecasters said.

It will also be increasingly blustery, particularly in and around any heavy showers or thunderstorms.

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Later in the week, the forecast remains "unsettled", according to the Met Office, with "strong winds and outbreaks of rain on Tuesday and Wednesday".

Widespread showers are predicted on Thursday with a risk of hail and thunder.

Earlier this month, a new record was set after the seventh consecutive day of temperatures above 30C in the UK - the longest run ever recorded in the month of September.