An amber extreme heat warning has come into force, with temperatures forecast to hit 37C (99F) in some parts of the UK over the next four days.
The Met Office alert for southern and central England and parts of Wales runs from midnight on Thursday until Sunday.
It has also issued its highest alert for fire severity over the weekend, warning there is an "exceptional" risk of blazes spreading in many places.
Firefighters have urged the public to help them prevent fires.
Jonathan Smith from the London Fire Brigade said he wanted to avoid scenes in July "where people lost their homes and livelihoods".
"In the first week of August last year, we attended 42 grassland and wildland fires, the same week this year we've attended 340," he said.
"Please don't barbecue in open spaces or balconies, throw your rubbish away safely and put your cigarettes out properly."
Mr Smith also warned people against using barbecues on balconies, saying they could lead to hot ash moving "very quickly".
In some areas, wildfires have broken out due to the heat. In Ryton, Gateshead, firefighters spent more than 24 hours tackling a fire which started in a field.
While the record-breaking temperatures seen in July, when the mercury topped 40C (104F) for the first time, are not expected this week, the heat in some areas could get close to local or regional records.
Temperatures reached 33.6C in the West Sussex village of Wiggonholt this afternoon, and are expected to climb further tomorrow.
"Temperatures won't be as high. But the big difference with this current heatwave is that it's much more prolonged," said BBC Weather forecaster Matt Taylor.
"We've already seen temperatures above 30C every day this week - Monday, Tuesday and Wednesday - and that will continue until Sunday."
Temperatures could reach 35C and peak at 37C in some areas between the Midlands and London, he added.
In Wales, Cardiff may see temperatures exceeding 30C in the coming days.
Scotland and Northern Ireland meanwhile are likely to be cooler, with the highest temperatures in the mid-20s, the Met Office says.
The high temperatures and dry conditions have also been causing problems across Europe - with more than 1,000 firefighters battling a "monster" wildfire in France that has destroyed nearly 7,000 hectares of forest.
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