Five fire engines and around 35 firefighters were called to a grass fire in Mayplace Road East in Bexleyheath.
Approximately one and a half hectares of grassland and undergrowth was damaged by fire.
A London Fire Brigade spokesperson said: "During the hot weather we are attending a large number of grass fires across London.
"We’re asking the public to take care not to drop cigarettes or matches on dry grass and to keep a very close eye on barbecues.
"Dropped glass can also start fires as the sun can magnify the sun’s rays.
"Grass fires can quickly spread and cause serious damage, so if you see grass smouldering, please call 999 immediately.”
The Brigade was called at 1455 and the fire was under control at 1611. Fire crews from Bexley, Erith, Plumstead and Sidcup fire stations attended the scene.