Environment Canada is calling for a risk of thunderstorms and a chance of showers in Whitchurch-Stouffville today, July 28, 2026, as a low-pressure system moves across Ontario. Residents planning outdoor activities should keep an eye on the sky, especially later this afternoon.
The forecast for Stouffville shows cloudy skies with a 40 percent chance of showers late this afternoon and a risk of a thunderstorm. The high is expected to reach 26°C, but with the humidity it will feel closer to 33°C. The UV index is moderate at 5.
This evening will stay mainly cloudy with a 40 percent chance of showers and a continued risk of thunderstorms. Winds from the north at 20 km/h will become light overnight, and the temperature will drop to a low of 17°C.
A low-pressure system that started over Duluth, Minnesota is behind the unsettled weather. Environment Canada warning preparedness meteorologist Geoff Coulson says the system will bring showers and thunderstorms across southern and eastern Ontario today, with the potential for strong wind gusts, large hail, and locally heavy rainfall. Some areas east of Lake Simcoe could see more than 75 millimetres of rain before Thursday morning.
The Lake Simcoe Region Conservation Authority and Toronto and Region Conservation Authority monitor watershed conditions and issue flood alerts for the Stouffville area. Residents can find current weather updates and any watches or warnings on the Environment Canada website.
Conditions are expected to improve later this week. Wednesday is forecast to be mainly sunny with a high of 26°C, and Thursday and Friday should be sunny with highs of 28°C and 29°C, just in time for the Civic Holiday long weekend.
