Environment Canada Issues Heat and Air-Quality Advisories for Five Provinces and One Territory

Environment Canada issued heat warnings, air-quality alerts or thunderstorm watches for five provinces and one territory on July 14, 2026. Cbc reported that all regions of Ontario except its northernmost areas fell under heat warnings, with southern parts forecast to reach the mid- to high-30s Celsius and humidex values in the mid-40s. A massive area of high pressure centered in the U.S.

Produced most of the warnings, Environment Canada meteorologist Geoff Coulson said. Ottawa was expected to hit 35 C, the hottest day of 2026 so far, while Toronto’s forecast high of 37 C could break the July 14 record of 36.7 C set at Pearson airport in 1995. Northern Ontario communities including Kenora, Thunder Bay, Fort Hope and Timmins were placed under a severe orange heat warning.

Heat-warning thresholds there are lower than in the south because they reflect historic norms and local impacts. An orange tornado watch covered the corridor between Montreal and Quebec City, including Drummondville, Trois-Rivières and Shawinigan. The watch stated that significant damage or destruction to infrastructure, homes and the natural environment was possible.

Municipalities including Ottawa opened cooling stations and pools. Environment Canada advised residents to watch for heat-exhaustion symptoms such as headache, nausea, dizziness, thirst, dark urine and intense fatigue, and to call 911 for signs of heat stroke. Wildfire smoke from significant activity west of Thunder Bay produced locally poor air-quality readings.

Dr. Courtney Howard, a Yellowknife emergency-room physician, said well-fitted N95 masks filter out about 90 percent of fine particulate matter from wildfire smoke.