Ontario and Quebec will see their hottest daytime temperatures on Monday and Tuesday, with the heat climbing past 30°C. The Canadian Press


June 23, 2025 Tags:

A strong heat dome has taken hold over Ontario and Quebec. Temperatures have soared past 30°C. With humidity, it feels more like 40°C to 45°C in many areas. Cities from Windsor to Timmins, and from Montreal to Abitibi, are experiencing the highest temperatures of the season.

Meteorologists expect the heat to peak on Monday and Tuesday. A change in air patterns should bring relief by Wednesday.

Prairies Feel the Chill

While the East bakes, parts of the West are shivering. The heat dome pushes cool air into the Prairies. Some areas in Alberta, Saskatchewan, and British Columbia are seeing heavy rain and even wet snow.

Southern Alberta got drenched, though flood warnings were lifted by Sunday. The Calgary Fire Department warned people to stay off the Bow River due to fast, dangerous currents.

In Saskatchewan, the Water Security Agency reported rising water levels along the South Saskatchewan River. This comes as Alberta released reservoir water to handle excess runoff.

Lake Diefenbaker is expected to rise more than a metre this week.

Dangerous Storms in Ontario

Northern Ontario saw strong storms over the weekend. A dangerous storm ripped through the Mattawa region on Saturday night. It forced the closure of Highway 17 and knocked down trees and power lines.

Ontario police helped evacuate around 290 people from two provincial parks. The Municipality of Calvin declared a state of emergency Sunday afternoon and asked people to avoid travelling.

Quebec on Alert

In Quebec, officials are on high alert. The government has urged schools to protect students and staff from the heat.

An education official advised school boards to take safety steps. That could include canceling classes if temperatures continue rising.

Health Warnings in Effect

Environment officials have warned people to be extra careful. Everyone is encouraged to drink water often, even before feeling thirsty.

People should watch for signs of heat exhaustion, take breaks, and avoid hard work during peak heat hours.

Meteorologist Julien Pellerin said, “Make sure you have a cool place to rest. Know your limits and stay safe.”

Heat Ripple Felt Nationwide

The heat dome over the East is not just a local issue. It’s affecting weather across Canada. From warm, humid air in Quebec to rain-soaked Alberta and snowy mountaintops in British Columbia—this weather pattern has triggered a chain reaction.

The heat wave may fade soon, but it leaves behind a reminder of how extreme weather patterns can hit different parts of the country in strange and unexpected ways.

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