Environment Canada’s rainfall warning for the St. Catharines-Grimsby-Northern Niagara Region remains in effect on Wednesday, March 11, 2026, as heavy rain moves through the region. The warning, which began on the evening of March 10, is expected to bring between 20 to 40 mm of rain through the day.
According to Environment Canada, the rainfall amounts could be even higher in areas where thunderstorms occur. This weather is caused by a series of low-pressure systems moving across southern Ontario.
Officials from the Town of Grimsby are asking residents to stay away from flooded streets and low-lying areas where water may collect. Water is expected to pool on roads, which can create dangerous driving conditions.
Local emergency services are currently on high alert, though no evacuations have been ordered at this time. Residents are also encouraged to keep an eye on their home utilities and be prepared for potential service disruptions as the rain continues.
