A heat warning has been issued for the City of Toronto and much of the Golden Horseshoe.
According to Environment Canada, temperatures near or above 31 degrees Celsius are expected on both Tuesday and Wednesday, but with the humidex it will feel more like 34 degrees Celsius.
That’s also prompted Toronto’s Medical Officer of Health to issue a heat warning as well.
Nightfall is not expected to bring relief from the heat with with an overnight low of 21 degrees Celsius expected on Tuesday night.
Heat warnings have also been issued for Pickering, Oshawa, Vaughan, Richmond Hill, Markham, York Region, Halton, Burlington, Oakville, Halton Hills, Milton, Dunnville, Caledonia, Haldimand County, Mississauga, Brampton and Hamilton.
The weather agency is advising the public to make sure they stay hydrated during the warm spell and say that while heat can put everyone at risk from heat illnesses, health risks are greatest for certain members of the community including older adults, infants and young children and people with chronic illnesses such as breathing difficulties, heart conditions or psychiatric illnesses.
Those who work in the heat and homeless people are also at an increased risk.
Temperatures are expected to fall somewhat on Thursday, with a high of 27 degrees forecast.
Heat warnings are issued when very high temperature or humidity conditions are expected to pose an elevated risk of heat illnesses, such as heat stroke or heat exhaustion.