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Cornwall to Montréal

Warnings

Forecast

Marine Forecast

Issued 03:00 PM EDT 27 July 2026

Tonight and Tuesday.

Wind light tonight and Tuesday.

Showers ending near midnight. Risk of thunderstorms late this afternoon. Showers Tuesday late in the day with a risk of thunderstorms.

Extended Forecast

Issued 06:00 AM EDT 27 July 2026
Wednesday Wind northeast 10 to 15 knots.
Thursday Wind northeast 10 to 15 knots.
Friday Wind light.

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Map of Great Lakes - Lake Erie and Lake Ontario marine weather areas CFB Trenton Port Colborne - 45142 Hamilton Munro Int'l Airport Oshawa Executive Airport Port Stanley - 45132 Lake Nipissing - 45152 Point Petre Georgian Bay - 45137 Toronto City Centre Airport Lake Simcoe - 45151 South Georgian Bay - 45143 Prince Edward Point - 45135 Peterborough Municipal Airport South Lake Huron - 45149 Collingwood Lake St Clair - 45147 Grimsby - 45139 Goderich Lagoon City Kingston Airport Muskoka Airport Parry Sound Harbour Grenadier Island Lake Simcoe Regional Airport Wiarton Airport Brockville Western Islands Cove Island Great Duck Island North Channel - 45154 Sarnia Chris Hadfield Airport Gore Bay-Manitoulin Airport Tobermory Harrow AAFC Long Point North Bay Airport Port Weller St. Catharines / Niagara District Airport Greater Sudbury Airport Southeast Shoal Vineland Station Port Colborne Erieau Cobourg Sault Ste. Marie Airport Windsor Airport Welland-Pelham Killarney Ajax - 45159 Point Pelee Burlington Lift Bridge
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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 AM EDT 27 July 2026 Today Tonight and Tuesday At 3:00 a.m. EDT today trough located on a line northeast-southwest
over Labrador.
By 8:00 p.m. EDT Tuesday quasi-stationary trough located over Lake
Ontario to Pointe-des-Monts.

Great Lakes - Lake Erie and Lake Ontario Area

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Marine Weather for Canada

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