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Cornwall to Montréal

Warnings

Forecast

Marine Forecast

Issued 03:00 PM EDT 19 July 2025

Tonight and Sunday.

Wind southwest 10 to 15 knots diminishing to light early this evening then becoming southwest 10 to 15 early Sunday morning. Wind veering to northwest 10 to 15 Sunday afternoon.

Scattered showers tonight and Sunday.

Extended Forecast

Issued 06:00 PM EDT 19 July 2025
Monday Wind northerly 15 knots.
Tuesday Wind light.
Wednesday Wind light.

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Map of Great Lakes - Lake Huron marine weather areas Cove Island Goderich Oshawa Executive Airport CFB Trenton Western Islands Wiarton Airport Point Petre Lake Simcoe Regional Airport Parry Sound Harbour Toronto City Centre Airport Muskoka Airport Lagoon City Brockville Hamilton Munro Int'l Airport Sarnia Chris Hadfield Airport Tobermory Cobourg Harrow AAFC Long Point Port Weller Burlington Lift Bridge St. Catharines / Niagara District Airport Southeast Shoal Point Pelee Vineland Station Welland-Pelham Erieau Windsor Airport Port Colborne Killarney South Georgian Bay - 45143 Grimsby - 45139 Georgian Bay - 45137 Prince Edward Point - 45135 Port Stanley - 45132 Lake St Clair - 45147 South Lake Huron - 45149 Sault Ste. Marie Airport Lake Simcoe - 45151 Collingwood Greater Sudbury Airport North Bay Airport Kingston Airport Peterborough Municipal Airport Grenadier Island Port Colborne - 45142 Great Duck Island Ajax - 45159 Gore Bay-Manitoulin Airport North Channel - 45154 Lake Nipissing - 45152
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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 19 July 2025 Tonight and Sunday At 3:00 p.m. EDT today trough located on a line northeast-southwest
over northern Ontario.
By 8:00 p.m. EDT Sunday trough located from Natashquan to the Gulf
of Maine.

At 3:00 p.m. EDT today high located on a line north-south over
Manitoba.
By 8:00 p.m. EDT Sunday high located on a line north-south over
Lake Superior.

Great Lakes - Lake Huron Area

Another Region

Marine Weather for Canada

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