Environment Canada has issued a rainfall warning for the Waterloo region as heavy rain and the threat of thunderstorms continue through Thursday, April 16, 2026. Residents should prepare for significant moisture accumulation that threatens to cause pooling on roads and elevated water levels in local streams.
The region is currently dealing with saturated ground from previous storms, which leaves little capacity to absorb additional rainfall. This follows an active weather period earlier in the week, including five thunderstorms that hit the Stanley Park neighbourhood in Kitchener on April 13, 2026, dropping 15.5 millimetres of rain and contributing to local road closures.
According to the Grand River Conservation Authority, between 20 and 40 millimetres of rain has already fallen in the northern part of the watershed. Officials expect an additional 30 to 40 millimetres of rain to fall between Wednesday and Thursday, with even higher totals possible in areas that experience direct thunderstorm activity.
The conservation authority warns that this extra water will increase flows in local rivers and creeks. Residents are advised to stay away from waterways, as banks are currently very slippery and the combination of fast-moving, cold water creates a significant safety hazard.
Forecasts indicate a continued risk of thunderstorms through Thursday morning, with an 80 percent chance of precipitation. While temperatures are expected to reach a high of 20°C, weather experts advise that people should head indoors immediately if they hear thunder.
