Last Summer Storm Slams Waterloo Region with Flooding and Outages
The summer of 2025 ended with a dramatic sendoff, as Waterloo Region was pounded by a severe storm that brought heavy rainfall, strong winds, flooding, and power outages. Depending on where you were, between 35 and 65 millimetres of rain fell in just a few hours between Sunday night and Monday morning. To put that into perspective, that’s close to an entire month’s worth of rain in one night, since the September average in this region is only about 70 millimetres.
The heaviest downpours were centered over Kitchener, where flooded streets and fallen trees caused serious disruptions. Drivers woke up to water pooling on major routes, including the expressway near the Flyover, Weber Street North at Lodge Street in Waterloo, and River Road East in Kitchener. At one point, the eastbound Highway 8 ramps at Fairway Road had to be shut down completely. Although the roads eventually reopened, the damage was already done, and many morning commutes were slowed by ponding and deep standing water.
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Meteorologists say the flooding was pretty much unavoidable. With that much rain falling in such a short period of time, the ground simply couldn’t absorb it. Steven Flisfeder, a meteorologist with Environment Canada, explained that once the soil is saturated, excess water has nowhere to go but across roads and into low-lying areas.
And it wasn’t just the water that caused trouble. Strong winds roared through overnight, knocking out power across the region. Enova Power reported that at the height of the outages, more than 2,300 customers were in the dark. Crews worked through the night, and by late evening most homes had their lights back on. But even into Monday morning, additional issues popped up. A pole fire in the Victoria Hills and Forest Hill areas left another 819 customers without electricity, although most had service restored by mid-morning.
Pictures of the storm quickly filled social media. Residents shared eerie shots of towering clouds rolling in, while others posted videos of flooded streets and high winds tearing through neighborhoods. Despite all of that, Waterloo Regional Police said they did not receive any storm-related calls overnight and reported no active road closures by mid-morning Monday.
But this was not just a farewell to summer—it was also the opening act for fall. The new season officially arrived Monday afternoon, and it brought with it the promise of more unsettled weather. Environment Canada cautioned that additional storms could roll in, along with muggy conditions that would make September feel more like July.
So, as the summer closed its chapter with a literal storm, Waterloo Region residents were reminded how quickly the skies can change and how much impact just a few hours of extreme weather can have on daily life. The last storm of the season left a clear mark—flooded streets, darkened neighborhoods, and a dramatic reminder that the weather often has the final word.
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