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. Spokesman Anthony Dorelas said officers closed several roads Saturday in Montreal’s West Island, including sections of Boulevard Pierrefonds and Boulevard Jacques-Bizard.

The force said its assistance to emergency responders ended around 2 a.m. Sunday.

Power outages continued to decline Sunday after storms left about 20,000 Hydro-Québec customers without electricity Saturday night. On Sunday afternoon, the utility reported 51 outages affecting 1,312 customers across Quebec.

Most of the remaining power outages were in the Montreal region, particularly in the West Island communities of Pierrefonds and Dollard-des-Ormeaux.

Hydro-Québec said Sunday morning that some outages were preventive and 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, in a social media post, urged travellers to check their flight status before heading to the terminal.

Anne-Sophie Hamel, an airport spokeswoman, said a lightning alert in effect from 3 p.m. to 7:30 p.m. brought operations at the airport to a standstill on Saturday. During that period, aircraft could not land or take off, and 25 flights were diverted.

Air Canada said flight disruptions were expected throughout Sunday. Hamel said the airport was operating normally Sunday, but the effects of the lightning alert were still being felt through flight delays and cancellations, as well as baggage delivery disruptions.

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.

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 on social media Sunday afternoon that he was monitoring the situation 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