Four fire engines and around 25 firefighters were called to a fire at Hanworth Air Park in Feltham.
Around three hectares of woodland was damaged by the fire. There were no reports of any injuries.
The Brigade's 999 control Officers took eight calls to the blaze.
A London Fire Brigade spokesperson said: “Whilst we have seen some rainfall, we’re asking Londoners not to be complacent.
"When the ground is very dry, it’s harder for water to be absorbed - which is why we have seen flash flooding as the water pools on the surface, but it also means that grasslands are still parched and the smallest of sparks could cause a fire.
“Please continue to help us prevent grass fires by not barbecuing on open land, clearing away rubbish and glass and safely disposing of cigarettes.”
The Brigade was called at 1239 and the fire was under control by 1515. Fire crews from Feltham, Twickenham and Heston fire stations were at the scene.