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Cornwall to Montréal

Warnings

Forecast

Marine Forecast

Issued 03:00 PM EDT 19 October 2026

Tonight and Tuesday.

Wind southwest 15 to 25 knots diminishing to light this evening then becoming northerly 10 to 15 Tuesday morning.

Extended Forecast

Issued 06:00 PM EDT 19 October 2026
Wednesday Wind light.
Thursday Wind light becoming northerly 10 to 15 knots.
Friday Wind light.

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Map of Great Lakes - Lake Erie and Lake Ontario marine weather areas Harrow AAFC Hamilton Munro Int'l Airport CFB Trenton Erieau Toronto City Centre Airport Point Pelee Peterborough Municipal Airport Burlington Lift Bridge Point Petre Cobourg Oshawa Executive Airport South Lake Huron - 45149 Port Colborne Brockville Gore Bay-Manitoulin Airport North Bay Airport Greater Sudbury Airport Killarney Sault Ste. Marie Airport Ajax - 45159 North Channel - 45154 Lake Nipissing - 45152 Lake Simcoe - 45151 Windsor Airport Lake St Clair - 45147 South Georgian Bay - 45143 Port Colborne - 45142 Grimsby - 45139 Georgian Bay - 45137 Prince Edward Point - 45135 Port Stanley - 45132 Welland-Pelham Grenadier Island Kingston Airport Collingwood Lagoon City Muskoka Airport Parry Sound Harbour Lake Simcoe Regional Airport Wiarton Airport Western Islands Sarnia Chris Hadfield Airport Vineland Station Southeast Shoal St. Catharines / Niagara District Airport Goderich Port Weller Long Point Tobermory
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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 October 2026 Tonight and Tuesday At 3:00 p.m. EDT today low 999 mb located south of Ungava Bay.
By 8:00 a.m. EDT Tuesday departing low 1003 mb located over
Labrador Sea.

At 3:00 p.m. EDT today high 1031 mb located over Lake Superior.
By 8:00 p.m. EDT Tuesday high 1034 mb located west of Lake
Saint-Jean.

Great Lakes - Lake Erie and Lake Ontario Area

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Marine Weather for Canada

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