Six fire engines and around 40 firefighters tackled a grass fire on Brookmead Road in Beddington.
Around three hectares of grassland was damaged by fire. There were no reports of any injuries.
A London Fire Brigade spokesperson said: “The warmer weather we have been having makes the ground extremely dry, which unfortunately means grassland and parks will burn quickly when exposed to even the smallest of sparks.
“We don’t want people to be complacent and that means not barbecuing in parks and open spaces, ensuring cigarettes are properly disposed of and clearing away rubbish and glass as they can magnify the sun and cause a fire.”
The Brigade was called at 1800 and the fire was under control by 1850. Fire crews from Norbury, Croydon, Tooting and Sutton fire stations attended the scene.
Brigade top tips on grass fires: