Residents in Southall were told to keep their windows shut on Thursday morning because of thick billowing smoke from a fire at a sports pavilion.
Around 60 firefighters tackled the blaze on Tentelow Lane from just after 2.30am before bringing the fire under control about 7am.
Station Commander Brett Loft, who was at the scene, said: “Crews worked hard to bring this fire under control. Due to the weather conditions the fire has created a lot of smoke in all directions and nearby residents are advised keep their doors and windows shut.”
Eight fire engines from Southall, Heston and surrounding stations were at the scene.
The fire comes after the London Fire Brigade experienced its busiest day since the Second World War because of multiple infernos across London caused by the hot weather.
The Brigade said Tuesday, which saw record-breaking 40C temperatures, was its busiest day for nearly 80 years, and that more than 40 homes were lost to flames.
Among the fires was a devastating blaze in Wennington, east London, which destroyed scores of homes, and a blaze in Dagenham, which left several homes unlivable.