The Met Office has issued yellow thunderstorm warnings for huge swathes of the country, with fears of flooding and damage to homes on its way.
Parts of the country are set to experience torrential rain, with between 20 and 30mm falling in an hour in some parts, and 50 to 80mm in three hours in others.
The warning, in place from the south west of the country to the north west, is in effect from 2pm today and lasting until 2am on Tuesday.
Homes in the affected regions could experience power cuts as well as structural damage owing to lightning strikes, as well as the risk of floods, according to the Met Office.
The warning reads: "Thunderstorms are likely to develop across parts of southwest England and Wales during Monday afternoon and become more organised through the evening.
"Lines of thunderstorms are expected to then move north during the early hours of Tuesday and gradually weaken as they clear into northern England before dawn.
"Whilst some places will see little or no rainfall, a few locations may see torrential rain with 20-30 mm falling in one hour and 50-80 mm in 3 hours.
"Additional hazards accompanying stronger thunderstorms include frequent lightning, hail and gusty winds, particularly during the evening period."
People driving have been warned of the dangers of spray, standing water, hail and huge gusts of winds which are likely to cause long delays for some drivers, as well as train services.
At home people could see flooding, with the Met Office warning there will "Probably [be] some damage to a few buildings and structures from either lightning strikes or gusty winds.
The warnings come after millions of people across London and south-east England, south-west England, most of Northern Ireland, large parts of Wales, east of England, Northamptonshire and Warwickshire woke to thunder and lightning overnight.
Giving his outlook for the week ahead, Brian Gaze from the Weatheroutlook said in a new blog post: "All of the UK can expect showers or longer spells of rain during the next few days as low pressure remains anchored to the west.
"By the middle of the week it starts to push eastwards leading to an increasing risk of more significant rain in central and eastern counties"
Meteorologists are also keeping their eye on ripples caused by Hurricane Danielle, which has stirred in the Atlantic during an unusually quiet storm season and is now moving west towards the Caribbean.
This could send a further band of heavy rain over to the British Isles, though this would depend on how pressure systems develop in the Atlantic throughout the week.
