Multi-Day Heat Warning Issued for Southern Ontario and Montreal, Humidex Up to 45°C

Environment Canada has issued heat warnings for Southern Ontario, including Windsor-Essex, Chatham-Kent, Sarnia-Lambton, and Montreal. Daytime highs of 30-36°C and humidex values of 37-42°C are expected for Windsor-Essex through Friday, potentially into the weekend, increasing to 40-45°C on Tuesday. Montreal faces a heat warning from Wednesday through Saturday with humidex values climbing between 40°C and 44°C. The prolonged heat and high humidity pose serious health risks.