Heat Warning From Environment Canada

People who work or exercise in the heat are also at a higher risk, as are those who are “socially isolated”, homeless, who can not care of themselves and others without access to air conditioning.

The city can expect varying amounts of sun and cloud with a slight chance of brief, isolated showers.

Some areas could see some relief due to showers and thunderstorms, but nights will be warm and muggy with lows of 20C to 23C.

The agency said more specific heat warnings would likely be issued Monday.

“A hot and humid air mass from the Gulf of Mexico will affect most of southern Ontario from Tuesday through Thursday”, Environment Canada said in its statement Sunday. “But as soon as that rain ends, the humidity should come back with a vengeance, and make it feel even more uncomfortable”.

“The risk of exposure to these temperatures and humidex may result in heat rash, heat cramps, heat exhaustion, or heat stroke”, the regional agency warns in a news release.

People with chronic illnesses, such as breathing difficulties.

Environment Canada urged Toronto residents to drink plenty of liquid – especially water – before feeling thirsty, which will decrease the risk of dehydration.