Hot and sticky conditions will continue across much of southwestern Ontario on Monday and Tuesday.
Environment Canada has issued a heat warning for London, Middlesex, Elgin, Oxford, Sarnia-Lambton, Norfolk, and Huron-Perth.
"A very warm and humid airmass will remain over the area [Monday]. Afternoon humidex values in the upper thirties to near forty are expected. It will be cooler near some lakeshore areas," the national weather agency said.
People should limit their time outdoors and drink lots of water to avoid heat related illnesses.
The extreme heat and humidity also makes conditions ripe for the development of thunderstorms. According to Environment Canada, there is a 60 per cent chance of showers and thunderstorms in the afternoon, evening, and overnight.
