Four fire engines and around 25 firefighters were called to reports of grass alight on Centre Road in Wanstead.
Around one hectare of grass and shrubland was damaged by fire. There were no reports of any injuries.
The Brigade's 999 Control Officers took 27 calls to the fire.
A London Fire Brigade spokesperson said: "London has had some incredibly hot days over the last week, which means the ground is extremely dry. Grassland and parks will burn quickly when exposed to even the smallest of sparks.
"If you see a grass fire, don't attempt to put it out yourself as grass fires can travel very quickly and change direction without warning. Call 999 and let us know where the fire is."
The Brigade was called at 1219 and the fire was under control by 1624. Fire crews from Leytonstone, Plaistow and Ilford fire stations attended the scene.
The cause of the fire is under investigation.