Four fire engines and around 25 firefighters attended a grass fire on Dagenham Road in Dagenham.
An area of grass and scrubland was alight.
A London Fire Brigade spokesperson said: "London is already facing its second heatwave of the year and we know that people will be looking forward to getting outside to enjoy the wonderful weather. But the high temperatures and low rainfall in recent months means the current risk of wildfires is severe.
“During this latest heatwave, it is important everyone acts responsibly to prevent fires from occurring. As the weather has been so dry, it only takes a few sparks to lead to a fire spreading rapidly. In London, this is can be dangerous because so many of our green spaces lie close to homes and other properties.
“If you’re heading out, please don’t take a disposable BBQ with you. They can retain heat for several hours after use and are banned by local authorities from many of London's parks. Also make sure you are discarding of smoking materials properly and take rubbish home with you if no bins are available.
“At home, make sure your BBQ is positioned away from flammable items like fences, sheds, decking and trees and please don’t have any type of BBQ on your balcony.
“We’re also strongly advising people to avoid burning any waste in this type of weather and to not have bonfires, particularly in their gardens.”
The Brigade received the first of 15 calls about the fire at 1959 and mobilised crews from Dagenham, Hornchurch and Essex County Fire & Rescue Service to the scene. The fire was largely extinguished by 2052.