Sunny skies are expected through the week and weekend, peaking at 20 degrees on Friday, with the Met Office issuing an amber wildfire warning.
The fire service has asked Londoners to be careful to avoid fires after a drier spring than usual, referencing recent devastating events in other countries.
London Fire Brigade Assistant Commissioner Paul McCourt said: “We want everyone to enjoy the sunshine but we urge people to take the necessary precautions to stay safe and help prevent a grass fire from starting.
“Recent events in Los Angeles and South Korea have demonstrated how rapidly fires can spread outdoors even when temperatures are not at their highest.
“The Met Office has issued an amber wildfire warning, covering London, and this will be in place for the rest of the week.
“As the weather warms up and we head towards Friday and the weekend, we would urge Londoners not to have barbecues in open spaces or on balconies, including disposable barbecues, to throw rubbish away, and to dispose of cigarettes carefully to avoid inadvertently starting a fire.
“We’re also working closely with partners, such as local authorities, to help manage the risks in outdoor spaces and ensure the public are following the safety advice.”
Londoners are being reminded that it only takes a small spark to ignite grass, shrubs, or litter.
Grass and land fires are commonly caused by discarded cigarettes and matches, rubbish left lying around and disposable barbecues.
