What’s in store this weekend for Canada? Extreme heat, severe storms, and smoke blanket

Millions of Canadians are under weather alerts this weekend as the country faces an unusual mix of dangerous heat, severe thunderstorms, and choking wildfire smoke, creating a storm of health and safety hazards. Environment Canada says southern Quebec will see daytime highs above 30°C starting Sunday(July 27), with humidex values, how hot it feels, soaring to around 40. Even at night, temperatures are expected to stay above 20°C, leaving little relief for residents.

“It will be particularly uncomfortable at night,” the advisory warns.

In southern Manitoba, the heat will peak Saturday, pushing humidex readings to 38 before a cold front brings some relief overnight. The province has already opened cooling centers in Winnipeg and Brandon for vulnerable residents.


Health Canada has urged Canadians to stay hydrated, avoid strenuous outdoor activity, and check on elderly neighbors, warning that extreme heat can cause dehydration, heat stroke, and even death.

Thunderstorms with hail and high winds

While heat bakes Quebec and Manitoba, northern Ontario is bracing for severe thunderstorms capable of producing nickel- to ping-pong-ball-sized hail, damaging winds of up to 90 km/h, and heavy downpours.

Impacted areas include remote communities and lakes such as Cat Lake, Birch Lake, and Senia Lake. Officials warn that power outages and property damage are possible if storms intensify.

Wildfire smoke chokes large regions

At the same time, wildfire smoke continues to blanket parts of Manitoba, Ontario, Quebec, Saskatchewan, and the Northwest Territories, pushing air quality to hazardous levels.

“Air quality and visibility due to wildfire smoke can fluctuate over short distances and can vary considerably from hour to hour,” Environment Canada cautions.

The smoke, carried by shifting winds from fires burning across Canada’s north and west, has forced many families indoors.

This latest bout of extreme weather comes during one of Canada’s most destructive wildfire seasons on record, with more than 3,300 active fires and millions of hectares burned so far. Two deaths have been confirmed this year, and tens of thousands have been displaced.

Officials urge Canadians to monitor alerts closely, use air purifiers indoors, and seek shelter in cooling centers when needed. Vulnerable groups, including seniors, young children, and those with heart or lung conditions, are at highest risk from both the heat and the smoke.