The Met Office has tonight issued an update on heavy thunderstorms hitting parts of the country after a hot weekend.
Forecasters said that downpours are now moving north-westwards across central England leading to some challenging driving conditions.
In Manchester, people were left trapped in submerged cars after thunderstorms flooded lanes on motorways and on major roads this afternoon.
Heavy rain caused flooding, which led to difficult driving conditions, and also festival-goers had their weekend plans disrupted when all nine stages at Parklife were forced to make a "full show stop" due to severe weather.
The period of heavy rain caused Monsall Road in Monsall to flood beneath a railway bridge, leaving a car and a van completely submerged in the water.
It comes after the Met Office issued multiple yellow warnings for thunderstorms across the country for the weekend as well as Monday.
Most of England, Wales, parts of Northern Ireland and Scotland may experience thunderstorms tomorrow, with a warning in force from 12pm until 9pm.
Forecasters have also said that almost a month's rain could fall over parts of the UK in the next 12 hours - but the country will still be hotter than Monaco.
Met Office meteorologist Dan Stroud said: "We're expecting Sunday to be another hot day across much of the country.
"We do have rain moving up north and westwards across the English Channel, up towards Bristol and into South Wales.
"We've got ourselves a yellow rain warning covering that area, and 10 to 20mm of rain is quite likely in a large area, some could see 40 to 60mm in three to six hours, some places in the West Country could see nearly a month's worth of rain in the next 12 hours.
"We've also got a yellow thunderstorm warning; the high temperatures today are likely to trigger a few thunderstorms during the course of the afternoon and evening until 9pm.
"Some spots could see 30 to 40mm within an hour, so an intense downpour of rain. Some spots could see in excess of 60mm in a very short period - there's likely to be some hazards from localised flooding and surface water issues.
"On Monday, we're expecting a fine and hot start, temperatures rising fairly quickly during the course of the morning under strong early summer sunshine and that's likely to spark a few thundery showers.
"Parts of Wales and England will see 30mm of rain in an hour, 60 to 80mm in some spots.
"North parts of Northern Ireland, south west Scotland and the Highlands could see 20 to 30mm of rain in an hour during the thunderstorms, and 40 to 50mm in some spots.
"It will widely be 24C to 28C on Monday, with some spots sitting at the 30C to 32C mark. It will be warmer than Monaco, where it has hit 24.7C on Sunday and is expected to be 22 to 24C on Monday."
Slightly cooler temperatures are on the way from Tuesday onwards, with Thursday and Friday in the mid-high 20s, the forecaster added.
The UK Health Security Agency has issued an amber alert for hot weather until 9am on Tuesday in the West Midlands, East Midlands, east of England, South East and South West.
A further yellow alert, which is less serious and says there may be some disruption to services due to weather conditions, is in place for the North East, North West and Yorkshire and Humber regions of England, as well as London.
UK 5 day weather forecast
This Evening and Tonight:
Thundery showers easing through the evening, however an area of heavy rain will continue to move northwards across central southern England and into South Wales. Elsewhere mostly dry but feeling warm and humid. Murky around some coasts in the west.
Monday:
Staying hot and humid for many on Monday, with plenty of sunny spells. Scattered slow moving thundery showers developing during the day. Feeling very warm but cooler near eastern coasts.
Outlook for Tuesday to Thursday:
Very warm and humid for many through this period, with plenty of sunny spells. The continued risk of thundery showers at first but becoming more settled. Warm and humid nights.
