A yellow weather warning lasting 24 hour has been issued by the Met Office for rain and flooding this weekend.
Huge swathes of the country are due to be affected heavy rain and thundery showers, which may lead to flooding and transport disruption in some places over the weekend.
A Met Office spokeswoman said: "Outbreaks of rain and some thunderstorms are expected to spread from the southwest on Friday night, this introducing unsettled conditions to much of England and Wales for Saturday and Sunday.
"Heavy, thundery showers are likely to break out by day, particularly on Sunday when these could be widespread and locally torrential.
The yellow weather warning covers most of the south of the UK
(Image: Met Office)
"Lightning and hail are also expected. Rainfall amounts will vary from place to place, but there is the potential for up to 100 mm to build up in some locations over the course of the weekend, much of which could fall in a short period of time."
They added that there is a small chance that homes and businesses could be flooded, causing damage to some buildings.
Spray and flooding could lead to difficult driving conditions and some road closures and there is a chance that some communities will become cut off by flooded roads.
She added that power cuts are also possible in some areas.
Meanwhile, the Met Office's first ever extreme heat-health warning has been extended another day for parts of England, Wales and Northern Ireland.
The initial warning was in place until yesterday but has been extended to Friday, July 23, for some parts of the UK as the hot weather is set to continue.
Brits have flocked to the seasides this week in desperation for water to cool off in as temperatures soared above 30C across much of the country.
The heatwave is so scorching Public Health England (PHE) issued a Level 3 heat-health alert on top of the Met Office's amber extreme heat warning.
The extreme heat warning raises the alarm over the threat of health effects including sunburn or heat exhaustion – dehydration, nausea, and fatigue – and other illnesses.
People avoiding the rain in Cambridge
(Image: James Linsell-Clark/ SWNS James Linsell-Clark/ SWNS)
Regions and areas affected by the weekend's heavy rain:
East of England
- Central Bedfordshire
London & South East England
- Bracknell Forest
- Brighton and Hove
- East Sussex
- Greater London
- Isle of Wight
- Milton Keynes
- West Berkshire
- West Sussex
- Windsor and Maidenhead
North West England
- Cheshire East
- Cheshire West and Chester
South West England
- Bath and North East Somerset
- Bournemouth Christchurch and Poole
- North Somerset
- South Gloucestershire
- Blaenau Gwent
- Merthyr Tydfil
- Neath Port Talbot
- Rhondda Cynon Taf
- Vale of Glamorgan
- Telford and Wrekin
- West Midlands Conurbation
Yorkshire & Humber
- East Riding of Yorkshire
- Kingston upon Hull
- North East Lincolnshire
- North Lincolnshire
- South Yorkshire