A government heat warning is in place for the region, but meteorologists are forecasting a drop in temperatures at the end of the week.
Thirty-three people have died in a heat wave that has baked the southern part of the Canadian province of Quebec.
She added that the majority of the victims in the city were men aged between 53 and 85 living in vulnerable conditions and without access to air conditioning.
While hot weather is expected to remain in Quebec next week, Serge Mainville of Environment Canada said it will be a dry heat.
Twelve of the dead were reported in the eastern province's capital Montreal, said regional public health director Mylene Drouin.
Meurtre d'Alexia Daval : son mari Jonathann nie l'avoir tuée
A l'issue de cette audition la semaine, ses avocats n'avaient pas souhaité communiquer afin "de ne pas nuire à l'enquête". Suite à quoi les parents d'Alexia Daval et sa petite sœur ont été convoqués ce mercredi 4 juillet pour être entendus.
Eighteen of those deaths have come in Montreal, where humid temperatures climbed past 43 degrees Celsius (110 degrees Fahrenheit).
None of the victims had air conditioning, and Kaiser said majority died inside of their homes. Signs of heat illness could include cramps and rashes, and among the people with the highest risk of suffering are generally older adults, young children, the homeless and people with chronic illnesses.
No deaths had been reported for the same period in the neighbouring province of Ontario, which has also sizzled under extremely high temperatures.
But Ontario does not track heat related deaths in the same way as Quebec and does not report on potential causes of death without a coroner's investigation.