Firefighters were called to a grass fire on Bridge Road in Erith.
An area of heathland measuring around 500 x 500m was alight. There were no reports of any injuries.
A London Fire Brigade spokesperson said: “It only takes a spark to ignite a fire and grass fires can be unpredictable and spread very quickly, causing significant amounts of damage.
“We’ve been working hard to prepare and respond to weather like this but we need everyone to play their part to reduce the risk of fires occurring.”
The Brigade was called at 1440 and the fire was under control by 1538. Two fire engines from Erith and Bexley fire stations attended the scene.