Environment Canada has issued its first major heat warning of the season, with parts of Ontario and Quebec bracing for a stretch of dangerously high temperatures. The alert, released Saturday, covers southern and eastern Ontario—including Toronto and Windsor—as well as southern and western Quebec.
Daytime highs are expected to soar between 31°C and 36°C, with humidex values pushing the perceived temperature to a sweltering 40°C to 50°C. The heat is forecast to intensify through Monday and Tuesday, with overnight lows offering little relief, staying above 20°C.
A cold front may bring some respite by late Tuesday, though its reach remains uncertain. If it stalls, the extreme heat could linger into Wednesday, particularly in southwestern Ontario.
Authorities are urging residents to stay hydrated, avoid strenuous outdoor activity during peak heat hours, and check on vulnerable individuals. Health Canada warns that symptoms like dizziness, rapid heartbeat, or confusion could signal heat exhaustion or heat stroke—conditions that require immediate attention.
This early-season heat wave is part of a broader trend, as climate change continues to drive more frequent and intense weather extremes across Canada.
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