Environment Canada has issued a Heat Warning for the southwest.
Extreme heat is expected Tuesday into Wednesday.
A slow moving surface ridge of high pressure from the Northwest U.S. is moving into the western prairies resulting in a prolonged period of hot and humid conditions.
Daytime high temperatures of near 32 degrees celsius and warm overnight lows of near 16 degrees celsius are expected.
A cooler break will appear Thursday and Friday followed by extreme heat again over the weekend.