Four fire engines and around 25 firefighters tackled a grass fire on Halcot Avenue in Bexleyheath.
Around three hectares of grass, trees and scrubland were damaged by fire. There were no reports of any injuries.
The Brigade’s 999 Control Officers took 19 calls to the blaze.
London Fire Brigade’s Assistant Commissioner, Pat Goulbourne, said: “The Met Office has issued a warning for extreme heat on Monday and Tuesday and we’re urging people to continue to take extra care and help us prevent fires on open land.
“Make sure rubbish, especially glass, is safely thrown away and cigarettes are always properly disposed of. Grass will be tinder dry after such hot weather, so please don’t have barbecues in parks and public spaces.
"Disposable barbecues that have been abandoned can still end up causing a fire as hot coals can smoulder and pose a real fire risk for some time after the flames die down – they need to be put right out and cooled before being safely thrown away.”
The Brigade was called at 1534 and the fire was under control by 1713. Fire crews from Bexley, Erith, Sidcup and Eltham fire stations attended the scene.