Separately on Thursday a committee of lawmakers said premature deaths from heatwaves in Britain could more than treble to around 7,000 a year by mid-century if the government does not take action.
The record breaking heat comes as people are being urged to either stay out of the sun or at least avoid being in the sun when it is at its strongest between 11am and 3pm.
It may be roasting in the big cities but down in the West Country there's a lovely sea breeze on the coast which lasts for about five or six miles inland.
"Temperatures are looking like they're going to build again towards the end of next week", he said, adding they could soar into the early 30s again.
Hot weather, especially when prolonged, with warm nights, can have effects on people's health and on certain infrastructure.
Monday was the hottest day of 2018 so far, with a temperature of 33.3°C recorded in Santon Downham in Suffolk.
A spokesperson for the Met Office said: "With hot air over the United Kingdom some scattered thunderstorms may form over parts of central and eastern England on Thursday afternoon".
Media playback is unsupported on your device Media caption The BBC's science editor looks at why we're facing worldwide heatwaves
Paul Gundersen, chief meteorologist at the Met Office, said: "If you're looking for somewhere to escape the heat, western and northern areas will have pleasantly warm mid 20s Celsius, although across Northern Ireland and western Scotland this may be accompanied by occasionally cloudy skies".
There is a chance the high temperatures could even beat the all-time United Kingdom record of 38.5C, with the hot weather set to continue into August.
It is officially the hottest day of the year so far in the United Kingdom with temperatures soaring to 35C in west London.
Forecasters are warning of torrential rain, with up to 30mm in less than an hour on Thursday afternoon in places as "scattered thunderstorms" strike. Keep your home as cool as possible - shading windows and shutting them during the day may help.
The longest dry spell this year is Brooms Barn, near Bury St Edmunds, where there hasn't been a drop of rain for 45 days.
The hottest July day on record is 36.7C, which was reached at Heathrow on 1 July 2015.More news: Former cricket star Imran Khan's party claims victory in disputed Pakistan election