Yesterday Surrey Fire and Rescue Service sent 40 fire engines including two water carriers to fight the grass fire which started on Chobham Common.
Around 60 properties from Heather Drive in Ascot have been evacuated due to plumes of smoke in the air where firefighters have told families not to return home.
Reports say the blaze can be seen from more than 20 miles away in west London.
Firefighters are expected to be on the scene throughout the day as outside temperatures continue to rise.