Nearly a month’s worth of rain to fall in just one day tomorrow as heatwave ends

Brits have been warned to expect nearly a month's worth of rain in just one day tomorrow (Sunday, September 17) as weeks of warm weather come to a rather sodden end.

The Met Office has issued yellow weather warnings for thunderstorms across the southwest of England and south Wales, covering cities including Bristol, Cardiff and Swansea.

The forecaster also said there was a "small chance" lives could be put at risk as a result of the torrential downpours.

READ MORE: Brits face wet weekend as Met Office issues 11-hour thunderstorm warning

Up to 70mm of rain could fall in the space of hours across parts of the affected area, while the average rainfall for the entire month of September in the same region 92.45mm.

"The heaviest and most persistent rain will be tomorrow morning, bringing a risk of some potential flooding in homes and businesses," Met Office meteorologist Rachel Ayers told MailOnline.

She added the affected region's weather will "remain unsettled" going into next week, with conditions expected to be "very changeable and autumnal".

The weather warning will be in place from 7am until 6pm tomorrow.

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And while other areas can't expect as much of a deluge, less summery conditions are still expected from this evening across most of the country.

The Met Office states on its website: "Drier with clear spells further north with a touch of frost possible.

"Feeling warm and humid in the south on Sunday with heavy, thundery showers spreading north across much of the country. Drier in the east at first, albeit a little cloudier."

Looking ahead to next week, the forecaster added: "Further heavy and thundery showers on Monday, turning drier and fresher from the west into the evening. Remaining unsettled with strong winds and outbreaks of rain on Tuesday and Wednesday."

It's bad news for sun seekers, who enjoyed highs of up to 27C in southern parts of the country today.

But there is hope on the horizon, as warm spells could return as late as October, prompting hopes of a second Indian Summer – a period of uncharacteristically warm weather in Autumn.

"With southerly winds coming up from Europe, that'll generally bring a slightly warmer direction of air for us and would then allow those temperatures to climb a touch more," Jonathan Vautrey, a meteorologist at the Met Office, previously told the Mirror.

"At this stage, already the real indication is that they'll be slightly increased and above average for certain during that warm spell, so that might allow us to push 20C, or 20C plus in some locations."

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