Following major flash flooding on June 20, 2026, that flooded basements, streets and a grocery store on Montreal's West Island, Environment Canada has issued a forecast for more heavy rain and thunderstorms across Greater Montreal on Sunday afternoon. The new storms could bring additional rainfall, raising concerns about further flooding in areas already saturated.
Flash Flooding on June 20
The flash flooding on June 20 caused significant damage on Montreal's West Island. Basements were inundated, streets turned into rivers, and a local grocery store was flooded, forcing temporary closures. Residents reported water levels rising rapidly, catching many off guard. According to local officials, emergency services responded to numerous calls for assistance, including water rescues and property damage assessments.
Sunday Forecast
Environment Canada is predicting a 70% chance of heavy rain and thunderstorms for Sunday afternoon, with potential rainfall amounts of 20 to 40 mm. The storms are expected to develop after noon and persist into the evening. Gusty winds and localized flooding are possible, especially in low-lying areas and near water bodies. Residents are advised to monitor weather alerts and avoid driving through flooded roads.
Impact and Preparedness
City officials have urged residents to prepare for potential flooding by clearing drains and moving valuables to higher ground. Sandbags are available at designated distribution points. The city’s emergency response team is on standby. “We are closely monitoring the situation and urge everyone to stay safe,” said a spokesperson for the City of Montreal. The recent flooding has highlighted vulnerabilities in the region’s drainage infrastructure, prompting calls for long-term investments in flood mitigation.
