The region is set for its hottest day of the year so far with temperatures expected to reach 30C.
The hot weather, caused by a warm plume of air that has worked its way northwards from Spain, has prompted health warnings.
Public Health England (PHE) is urging people to look out for elderly relatives and friends who may be susceptible to the high temperatures - and to take extra care of young children, babies and those with heath issues.
There are also warnings to stay out of the sun between 11am and 3pm, avoid physical exertion at the hottest times of the day and stay in the shade - and to put on a hat and wear sunscreen.
Dry, hot and humid across much of the region, with a low chance of a thundery shower inland through the afternoon.
Feeling cooler towards the coast, with a light breeze.
Maximum Temperature 30 °C.
Very warm, moist air spreading north and northeast across the western side of the UK is expected to produce thunderstorms later on Tuesday, then transfer eastwards during Wednesday.
Rainfall will be very variable, and the extent of thunderstorms is uncertain, but some places could see around 30 mm in an hour and more than 50 mm in a few hours.
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Apart from the odd light shower on the hills, Saturday should be mostly dry with some bright or sunny spells, especially across the east of the region.
Maximum Temperature19 °C.