Collingwood, Ontario, is under a heat warning this week as temperatures are expected to climb well above normal, peaking on Tuesday with a high of 34°C. The warning, issued by Environment Canada on Monday, July 13, 2026, covers the Barrie–Collingwood–Hillsdale area and warns of humidex values reaching into the low 40s.
The heat is forecast to build through Monday, with a high of 32°C and a humidex of 38. Tuesday will be the hottest day, with the temperature reaching 34°C to 37°C—about 8 to 11°C above the seasonal normal of 26°C. The humidex could make it feel as hot as 42. Overnight lows will only dip to around 22°C on both Monday and Tuesday nights, giving people little chance to cool down. The UV index is expected to be very high, at 8 to 9 out of 11, meaning sunburn can happen quickly.
The weather should start to ease through the week, with Thursday’s high around 28°C and a chance of showers, before temperatures drop closer to 25°C by Friday. Until then, residents are being urged to drink plenty of water, stay out of the sun during the hottest part of the day, and check on neighbours who might be more at risk.
To help people cope, the Town of Collingwood has opened a number of cooling centres. These include the Collingwood Public Library at 55 Ste. Marie Street, the Centennial Aquatic Centre at 451 Third Street, Central Park Arena at 85 Paterson Street, Eddie Bush Arena at 97 Hurontario Street, the Museum/Station at 45 St. Paul Street, and the Transit Terminal at Second and Pine Street. They are open during their regular hours and offer a place to escape the heat.
Environment Canada issues heat warnings in this region when daytime highs hit 31°C or more and overnight lows stay at or above 20°C, or when humidex values reach 40, for at least two days in a row. The Ontario Heat Warning system is designed to trigger early alerts so communities can prepare. The Simcoe Muskoka District Health Unit monitors the forecasts and helps guide the local response.
The heat can be dangerous for everyone, but older adults, young children, people with chronic health problems, those who work or exercise outside, and people without stable housing are especially vulnerable. Health officials advise keeping activity light, seeking air-conditioned spaces, and never leaving children or pets inside parked vehicles.
