30-50 mm: Cold, heavy rain may disrupt weekend plans in Ontario
Heavy rain and gusty east winds to bring cool, damp conditions to southern Ontario this weekend
A rain-filled system is set to bring wet conditions to southern Ontario this weekend.
After a dry finish to the workweek, rainfall will begin spreading across the southwest and the Greater Toronto Area (GTA) on Saturday morning. Heavy rain is expected to persist throughout the afternoon and evening, impacting outdoor plans across the region.
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An east wind off Lake Ontario is set to bring cooler air into the Golden Horseshoe, as well, with gusts forecast to reach 50-60+ km/h, adding to the brisk conditions.
Weekend washout: 20-50 mm of rain is forecast in parts of Ontario through Sunday
The progression of the rain system will slow due to a high pressure area over the Maritimes, resulting in extended periods of rainfall and the potential for localized washouts in parts of southern Ontario.
By late Saturday afternoon, rain will extend into eastern Ontario and persist into Sunday, with off-and-on showers likely continuing across southern Ontario through the day.
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The heaviest rainfall totals are expected in southwestern Ontario, where atmospheric moisture could boost accumulations to 30-50 mm, particularly from Windsor to the Lake Erie shoreline and possibly Niagara.
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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 rain system could bring additional showers to 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