Mop-up begins after storms dump up to 100 mm of rain on Montreal
Preliminary data compiled by Environment Canada posted Sunday night reported that the island of Montreal had received 70 to 100 millimetres of rain.
On the North Shore of the Montreal area, a total of 80 to 110 millimetres was recorded, while the totals stood at 40 to 70 millimetres in the Montérégie region.
The heavy rains quickly flooded streets and residences, submerging Highway 40 in the West Island, flooding basements in the city's east end and temporarily transforming major thoroughfares across the island into canals. The storm also delayed flights at Montreal—Pierre Elliott Trudeau International Airport.
At its height on Sunday afternoon, the storm system had knocked out power to nearly 100,000 households across Quebec, a number that had dropped to less than 5,000 early Monday morning.
Quebec public security minister François Bonnardel took to social media to say his ministry was in contact with those municipalities affected by the rains and was also 'in contact with our partners' and Hydro-Québec and the provincial transport ministry.
Les équipes du @secpubliqueqc sont en contact avec les municipalités touchées par la pluie et les orages dans les régions des Laurentides, de Lanaudière, de la Montérégie, de Laval et de Montréal. Le centre des opérations gouvernementales va rester vigilant alors que les orages…
— François Bonnardel (@fbonnardelCAQ) July 13, 2025
After blowing through the Laurentians, the Montérégie, Laval and Montréal, the storms headed downriver to Quebec City, where they disrupted the Festival d'été activities and forced the cancellations of most of the scheduled concerts.
While the rains may have stopped, Environment Canada said the extreme heat will continue Tuesday and Wednesday.
Heat warnings remain in effect for the Montreal area, Lachute, Lanaudière, the Montérégie and Drummondville. Similar warnings are in effect for Ontario.
This story was originally published July 14, 2025 at 5:54 AM.
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