Ontario and Prairies Issue Heat Warnings as Temps Near 40°C

A widespread and potentially dangerous heat wave has returned to Ontario and parts of the Prairies, with Environment and Climate Change Canada issuing heat warnings across the majority of the province and into southern Manitoba and Saskatchewan. The agency issued a yellow-level heat warning for Toronto and much of southern Ontario, including the Greater Toronto Area, Waterloo Region, Guelph, Windsor, and Ottawa, effective Monday, July 13, 2026. More severe orange warnings are in effect for parts of northern Ontario and southern Manitoba, where conditions are expected to be most intense.

Forecasters say the heat event began on Monday and is expected to peak on Tuesday, July 14, before dissipating by Wednesday or Thursday evening. In southern Ontario, maximum temperatures are forecast to reach between 30 and 37 degrees Celsius, with humidex values making it feel like 38 to 45 degrees. Overnight lows are expected to offer little relief, staying above 20 degrees. Northern Ontario and southern Manitoba could see temperatures approaching 40 degrees, with humidex values reaching 45.

In response, the City of Toronto has activated its Heat Relief Strategy. This includes opening more than...