Toronto is bracing for its second heat event of the week, with Environment Canada issuing a heat warning for the city and much of southern Ontario. Daytime highs are expected to reach the mid-30s Celsius, with humidex values potentially hitting 45, according to the federal weather agency.
The warning, effective from July 13, 2026, advises residents to take precautions against heat-related illnesses. Vulnerable groups, including seniors, children, and those with pre-existing health conditions, are urged to stay hydrated and seek air-conditioned spaces.
Environment Canada notes that heat warnings are issued when temperatures or humidex values pose an elevated risk of heat stroke or exhaustion. The agency recommends checking on neighbors and avoiding strenuous outdoor activities during peak heat hours.
