Environment Canada has ended its heat warning for Toronto.

The heat warning was also lifted early Sunday for Hamilton, Burlington, Oakville, Halton Hills, Milton, Mississauga, Brampton, Vaughan, Richmond Hill, Markham, Pickering, Oshawa and southern Durham Region.

Environment Canada is calling for a high of 29 C for Toronto on Sunday, with the humidity making it feel closer to 34. There's also a 40 per cent chance of showers late Sunday afternoon with a risk of a thunderstorm. The low for Sunday night is expected to hit 23 C.

"The Greater Toronto Area is no longer in the heat warning, as southeast winds off of Lake Ontario, combined with more cloud cover today, should provide some temporary relief," Environment Canada said Sunday in a statement.

"As a result, temperatures are forecast to reach the high 20s this afternoon."

On Saturday, Toronto Public Health issued an extended heat warning for the city based on information from Environment Canada.

The city also opened cooling centres at seven locations while urging residents to check on neighbours, friends and older family members at risk of developing heat related-illnesses.

Toronto Public Health, which monitors the weather for health concerns, issued six heat warnings and four extended heat warnings in July. All of its extended heat warnings in 2016 have been issued this month.

For all of 2015, Toronto Public Health issued eight heat warnings and four extended heat warnings. There was only one heat warning issued in 2014.