After several deaths as people try to avoid the heat, emergency services issue essential tips on keeping safe from grass fires and swimming.
This coming week will be hot, and humid at times. Most places will remain dry with some lengthy sunny spells.
If you thought it was warm last weekend, brace yourselves for Saturday.
When the sun comes out, Londoners head to the parks by the thousand.
But all that extra use has taken its toll on the Royal Parks deckchairs, and there's more hot weather on the way, so 6,720 of them will have their old canvas stripped and recycled into reusable bags. .
That means two miles (4,700 metres) of new canvas has had to be ordered. Enough to stretch from Buckingham Palace to Primrose Hill.
In the last couple of hours the Met Office has advised that it is likely to downgrade its heatwave warning from level 3 to level 2 over the weekend as temperatures are dropping - but it could well be raised again next week as temperatures rise again.
Mertin Stew reports:
The heatwave is taking its toll of London's emergency services. With no let-up in the soaring temperatures, firefighters and paramedics have seen a surge in calls.
And as Londoners heed advice about coping with the heat, Thames Water said it has seen a 15% rise in the demand for tap water in the capital. Piers Hopkirk reports:
Crews are tackling a grass fire the size of 3 football pitches on Bridge Road, Erith. We're working hard to bring it under control #heatwave
Ambulance crews are struggling to cope in the heatwave as they try to rescue people in "dangerously high" temperatures.
Paramedic Karl Paddison warned that even healthy people can fall foul of hot sun, adding that the London Ambulance Service has to attend to people who have collapsed on a daily basis.
And the the worst effects are being felt by people stuck in lifts, in the capital's Underground, or those who are so burned they have to be admitted to A&E with sun stroke.
Mervyn Kohler, special adviser to charity Age UK has told ITV London that heat can be "stressful" for older people, as scorching temperature continue across the UK.
Mr Kohler said: "For God's sake, let's enjoy it, you have to act sensibly and responsibly, and enjoy the warm weather".
Westminster council has said it is deploying extra teams on estates and sheltered blocks to ensure elderly and vulnerable people were not suffering in the heatwave.
A team of 50 staff spent the last 24 hours checking to ensure tenants have enough water, are keeping cool with fans and open windows and are not falling foul of the weather conditions, said the council.
Tony Andrews, Westminster Council’s Emergency Planning Manager said: “We have given out heat safety advice to all of our teams out on the ground and to the care agencies and meals on wheels teams who look after older and vulnerable people.
"They are visiting thousands of people to help them keep well in this extreme weather.”