Severe storms to target northwestern Ontario before the weekend

A low pressure system tracking into northwestern Ontario Friday evening will bring the risk of severe storms, including heavy rain, strong winds, and hail, with a significant temperature drop expected once the system passes

Active weather is set to move across the international border, bringing the risk of severe storms to parts of northwestern Ontario before the weekend.

Visit our Complete Guide to Fall 2026 for an in depth look at the Fall Forecast, tips to plan for it and much more!

A low pressure system developing in South Dakota will track towards the region by Friday evening.

Be sure to stay alert to the changing conditions, and check for any weather warnings in your area.

Baron - Friday thunderstorm risk Ontario - Sept 10

Risk for strong storms Friday evening and overnight

Storm initiation will begin stateside Friday afternoon before moving into Ontario near the warm front. Thunderstorm activity will likely begin as discrete cells before evolving into linear storm systems as the associated cold front pushes in.

Baron - Precipitation Friday Ontario 8 pm - Sept 10

Key hazards include large hail, heavy rain, and strong wind gusts. There is also potential for rotating storms, depending on the timing of the storm band.

Thunder Bay is forecast to see storm activity later Friday evening into the overnight hours. While intensity may weaken by this time, some severe conditions, including torrential rainfall, remain possible.

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Baron - Saturday precipitation timing 12 am

Currently, confidence in storm timing is low due to poor computer model agreement. A delay in storm initiation would reduce impacts across the region. Stay updated with the latest forecasts.

DON'T MISS: Meteor shower season is about to begin!

Once the cold front passes, temperatures in northwestern Ontario will drop significantly, falling below seasonal averages.

Baron - Ontario Sunday temperatures - Sept 10

Cities like Kenora could see daytime highs dip below 15°C for the first time since mid-June.

Stay tuned to The Weather Network for the latest forecast updates in Ontario.

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