Wednesday will be another scorching day in parts of central and eastern Canada, including Toronto.
Environment Canada has issued several heat warnings for southern Ontario and southern Quebec with highs expected near 31 C and a humidex exceeding 40 C.
The warnings stretch from Windsor to Hamilton in Ontario and from Gatineau to the Eastern Townships in Quebec.
Environment Canada says a very hot and humid southeasterly airmass is slowly moving through the region.
Much of southern Ontario is also under a severe thunderstorm watch. Environment Canada said that storms capable of producing heavy rainfall, large hail and high winds could develop starting this afternoon, ending this evening.
The weather agency says a cold front will return temperatures back to seasonal levels beginning in Ontario late Wednesday night and in Quebec by Thursday morning.