"People waking up Tuesday morning might feel a bit of relief from the extreme heat of the weekend, but it is only a short cooldown", she said.
"A cold front is going to come Thursday night, and that will drop our temperatures back to more normal ones, especially for this weekend", says Cheng.
The heat is hanging in there but take heart - it was a mere 18 C at dawn Tuesday and daytime highs will stay in the 20s by Friday.
The spate of deaths may seem high, but Dr. Mylene Drouin, Montreal's regional director of Public Health, says it could have been much deadlier. The city has extended its pool hours and opened its seven cooling centres, which provide air-conditioned spaces and cold drinks.
The warnings stretch from Sudbury and North Bay down to Windsor and east past Montreal.
The new system is a partnership between Environment and Climate Change Canada, Health Canada and the Nova Scotia Department of Health and Wellness. Temperatures in Canada's largest city have topped 30 degrees every day since Friday. The last one was in 2011 at eight days.
A heat warning issued by the weather agency also says humidex values of 35 C degrees or more are expected throughout the entire province.
University of Waterloo climate scientist Blair Feltmate says the heat wave can't be directly attributed to climate change, but that suggesting the two aren't linked would be like arguing that no particular home run can be attributed to steroids when a baseball player on a hitting streak is caught doping.
"This will be the most significant heat event in the past few years", according to Environment Canada. Never leave people or pets inside a parked vehicle.