Most of the GTA, including Toronto, remains under a heat warning — which was issued by Environment Canada on Friday.
“Daytime maximum temperatures in the low thirties are expected along with overnight low temperatures near the 20 degree mark,” the national weather agency said in its warning on Monday.
“There may be a brief respite from the heat in some areas today as showers or thunderstorms are possible.”
The hot, humid air also means the air quality index is approaching the high-risk category.
680 NEWS meteorologist Jill Taylor said the high will be 31 C but it will more like 40 C with the humidity. She said there is a chance of showers or thunderstorms late afternoon and into the evening.
A cold front is expected to deliver a cooler and less humid air mass Tuesday.