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Weather Alert: Thunderstorm Risk in Southern Ontario on April 2, 2026

by All About Durham Editorial Team in Weather
weather alert thunderstorm risk
weather alert thunderstorm risk

Oshawa, Whitby, Ajax, Pickering – A stormy and rainy Thursday is expected across southern Ontario, with a potential risk of thunderstorms affecting several parts of the Greater Toronto Area (GTA). Environment Canada forecasts showers throughout the day, along with wind gusts and a drop in temperatures, particularly in the Durham Region.

The morning hours will be overcast with steady showers in areas such as Oshawa, Pickering, Whitby, Ajax, and surrounding cities. Localized rain will sweep across the region, with the chance of heavier downpours and gusty winds reaching up to 40 km/h. By noon, temperatures will hover around 4°C in Mississauga, but the afternoon could see some relief with a slight increase in temperature.

As the day progresses into the evening, there’s a 40% chance of continued showers, accompanied by the possibility of thunderstorms in southern Ontario, particularly in the GTA and areas farther south. Residents should be prepared for unexpected weather changes, with the potential for lightning and rainfall through the night. Fog patches are also expected to develop during the evening but should dissipate by midnight.

On Friday, the weather forecast remains unsettled with cloudy skies and another 60% chance of rain. Mississauga and areas further west could see a warmer day with highs reaching up to 22°C and lows dipping to 4°C. These fluctuating conditions make for a typical springtime scenario in Ontario, where rapid changes in temperature and weather are common.

For those in Durham Region, the upcoming storm could bring visibility issues during the evening, and there may be localized flooding in areas prone to heavy rain. Oshawa, Ajax, and Pickering residents are advised to monitor weather updates closely throughout Thursday and Friday for potential hazards associated with the storms, including the risk of flash floods.

Stay prepared by checking local forecasts regularly, and take precautions against strong winds and potential disruptions caused by thunderstorms.

Reported by

All About Durham Editorial Team

The All About Durham Editorial Team covers local news, events, public safety, weather and community updates across Durham Region, Ontario.

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