Officials say a massive wildfire that destroyed parts of Canada's oil sands capital hasn't grown in size around Fort McMurray and officials are bringing in more firefighters to gain the upper hand.

Alberta senior wildlife manager Chad Morrison said Friday that cooler temperatures, higher humidity and a rain forecast have enabled officials to put more firefighters on the ground.

Morrison says the province plans to bring in 1,000 firefighters over the next two weeks, adding to 1,100 already on the ground.

The blaze, which began May 1, is 1,930 square miles (5,000 square kilometers), which includes areas that are currently burning and those that have already burned, along with nearly three square miles (eight square kilometers) in Saskatchewan.

Officials hope to have the more than 80,000 evacuees return home starting June 1.