Heavy rain causes flooding and power outages across Montreal area

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Dimitrios Beis, mayor of Montreal’s Pierrefonds-Roxboro borough, said “hundreds of homes” had been flooded since Saturday afternoon.

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Beis said the borough opened a temporary shelter at the Pierrefonds arena on Saturday and mobilized volunteers to help vulnerable residents remove belongings from their homes.

Errol Johnson, deputy mayor of Dollard-des-Ormeaux, said the city was facing “a very difficult situation” following the storm.

Montreal police were also called in to assist with the flooding response. Montreal police spokesperson Anthony Dorelas said officers closed several roads Saturday in Montreal’s West Island, including sections of Boulevard Pierrefonds and Boulevard Jacques-Bizard.

Hydro-Québec reported that about 7,200 addresses remained without electricity shortly after 10 a.m. Sunday, down from roughly 20,000 outages reported Saturday night.

Most of the remaining power outages were in the Montreal region, particularly in the West Island communities of Pierrefonds and Dollard-des-Ormeaux. Another 2,200 outages were reported in the Montérégie region, south of Montreal, where Mercier and Rigaud were among the municipalities most affected.

Hydro-Québec said Sunday morning that some outages were preventive and that crews were continuing to restore electricity to affected customers.

The storms also disrupted flights and ground operations at Montreal-Trudeau International Airport on Saturday evening. The airport urged travellers on social media to check their flight status before heading to the terminal.

Some travellers reported on social media that they had spent the night at the airport after waiting more than 16 hours for flights that were delayed or cancelled.

Air Canada said flight disruptions were expected throughout Sunday. According to the airport’s website, a few flights scheduled for Sunday morning were cancelled or rescheduled.

On Montreal’s South Shore, the city of Saint-Constant, about 25 kilometres southwest of downtown Montreal, declared a local state of emergency Saturday night after heavy rainfall caused flooding and damage to residential properties and road infrastructure. Residents were urged to limit water use to help prevent sewer backups.

By Sunday morning, city officials said conditions had stabilized and the local state of emergency had been lifted. Most roads had reopened and residents could proceed with water removal efforts without fear of sewer backflow.

Quebec Domestic Security Minister Ian Lafrenière said Saturday night that he was monitoring the situation closely and that provincial officials were in contact with affected municipalities.

This report by The Canadian Press was first published June 21, 2026.

The Canadian Press