London was put on wildfire alert as temperatures were set to spiral towards 34C in coming days.
The London Fire Brigade (LFB) raised the alarm about a higher than normal threat of wildfires due to the wet and warm winter, which encouraged grass and plants to grow, followed by one of the driest Aprils on record.
“The risk of wildfire is very real,” said Paul McCourt, LFB Assistant Commissioner, as temperatures in London could on Monday hit a new record of 33C for May, with 34C predicted the following day.
“The Natural Hazards Partnership has assessed there will be a heightened risk of wildfires in London over the Bank Holiday weekend, as well as the half-term school holidays.
“So we must all play our part to protect our green spaces and surrounding communities.”
London saw a series of wildfires last summer including in Dagenham, Rainham and Wanstead.
With Britain experiencing the hottest day of the year so far, fire chiefs stressed that many Londoners may not realise the risk of lighting a widespread blaze from a barbecue even in spring.
They urged people to try to prevent grass fires and wildfires by not using disposable barbecues, which are banned in many London parks, and to also be careful when disposing of cigarettes.
Key LFB advice on barbecues includes:
* Position it on level ground
* Ensure it is away from flammable materials like fences, sheds and trees
* Don’t have a barbecue on a balcony or decking
* Keep children and pets away from barbecues
Wildfires are more common in Outer London, including popular venues such as Epping Forest, than in the city centre, given that there are more and bigger green spaces.
“With higher temperatures expected, we’re urging people not to light fires or barbecues of any kind, and to take litter home,” said Caroline Haines, chair of the City of London Corporation’s Epping Forest and Commons Committee.
Temperatures reached 26.9C in Heathrow, west London, early on Friday afternoon, the Met Office said.
They may climb to 33C in the capital or other parts of southern England on Monday.
The current May record is 32.8C in London's Camden Square in 1922.
Homeowners in London are being warned that indoor temperatures could rise to 38C.
High temperatures could also make conditions sweltering on the Tube, buses and other public transport.
The UK Health Security Agency (UKHSA) issued an amber heat health alert on Friday for London, the wider South East, East of England, and Midlands.
The warnings are in place from 2pm on Friday until 5pm next Wednesday.
They mean there is likely to be “a rise in deaths, particularly among those aged 65 and over or with health conditions” and increased demand on health and social care services.
Highs of 28C were expected in parts of the South East on Friday before climbing above 30C across many parts of England.
People have been advised to keep their homes cool by closing windows and curtains in rooms that face the sun, and cover up with suitable clothing, such as a hat and sunglasses, when going outside.
They should also seek shade and apply sunscreen regularly, and are advised to keep out of the sun between 11am and 3pm.
Physical activity such as exercising or walking a dog should take place in the morning or evening when temperatures are cooler, UKHSA added.
Vets have also warned pet owners to watch their animals for signs of overheating, such as excessive panting or thirst, and make sure they stay hydrated by leaving out plenty of water.