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Cornwall to Montréal

Warnings

Forecast

Marine Forecast

Issued 03:00 PM EDT 07 August 2026

Tonight and Saturday.

Wind light becoming southwest 10 to 15 knots Saturday evening.

Scattered showers overnight and Saturday. Risk of thunderstorms Saturday afternoon and evening. Fog banks forming near midnight and dissipating Saturday morning. Visibility 1 mile or less in fog banks and as low as 1 mile in showers.

Extended Forecast

Issued 06:00 PM EDT 07 August 2026
Sunday Wind southwest 10 to 15 knots.
Monday Wind southwest 15 to 20 knots.
Tuesday Wind west 10 to 15 knots.

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Map of Great Lakes - Lake Huron marine weather areas Erieau CFB Trenton Muskoka Airport Parry Sound Harbour Toronto City Centre Airport Lake Simcoe Regional Airport Wiarton Airport Point Petre Lagoon City Western Islands Cobourg Port Colborne Windsor Airport Point Pelee Welland-Pelham Vineland Station Burlington Lift Bridge Southeast Shoal St. Catharines / Niagara District Airport Goderich Port Weller Long Point Harrow AAFC Hamilton Munro Int'l Airport Tobermory Sarnia Chris Hadfield Airport Oshawa Executive Airport Collingwood Port Stanley - 45132 Prince Edward Point - 45135 Georgian Bay - 45137 Grimsby - 45139 Port Colborne - 45142 South Georgian Bay - 45143 Lake St Clair - 45147 South Lake Huron - 45149 Lake Simcoe - 45151 Lake Nipissing - 45152 North Channel - 45154 Ajax - 45159 Sault Ste. Marie Airport Killarney Greater Sudbury Airport North Bay Airport Gore Bay-Manitoulin Airport Peterborough Municipal Airport Brockville Grenadier Island Kingston Airport
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buoy Buoy
land station Land Station
Ice Conditions

There is no ice forecast issued for this area.

Warnings

No watches or warnings in effect.

Synopsis

Technical Marine Synopsis

Issued 3:00 PM EDT 7 August 2026 Tonight and Saturday At 3:00 p.m. EDT today flat low located from Labrador to Lake
Ontario.
By 8:00 p.m. EDT Saturday flat low located over the Gulf of
St. Lawrence.

At 8:00 a.m. EDT Saturday trough located on a line
northeast-southwest over James Bay.
By 8:00 p.m. EDT Saturday trough located on a line north-south
over western Lake Saint-Jean.

Great Lakes - Lake Huron Area

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Marine Weather for Canada

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