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Lighter totals of 10-20 mm are forecast for Toronto, Ottawa, and Barrie. There is a low risk of isolated thunderstorms, and a slight chance across the southwest.
Cooler daytime highs are also anticipated under dense cloud cover and rainfall: 10-12°C for Toronto, mid-to-high teens in Ottawa, and up to 20°C in Windsor.
Showers on Saturday may also impact preparations for Montreal’s Formula 1 Grand Prix on Sunday, although lower rainfall totals are expected in the city, with clearing likely later in the day.
A quick-moving system could bring additional showers and a risk of isolated thunderstorms to parts of southern Ontario late Sunday evening into Monday morning, though forecast confidence remains low for this event.
Looking ahead to the end of May, drier conditions and temperatures near 20°C are anticipated, offering a more comfortable stretch of weather.
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This weather pattern is likely to persist into the early days of June.
Stay with The Weather Network for the latest across Ontario
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