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Cornwall to Montréal

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Marine Forecast

Issued 03:00 AM EDT 18 August 2026

Today Tonight and Wednesday.

Wind light increasing to southwest 15 to 20 knots Wednesday morning then becoming southwest 15 Wednesday evening.

Showers Wednesday with a risk of thunderstorms.

Extended Forecast

Issued 06:00 PM EDT 17 August 2026
Wednesday Wind light increasing to southwest 15 to 20 knots in the morning.
Thursday Wind light becoming southwest 10 to 15 knots.
Friday Wind light becoming southwest 10 to 15 knots.

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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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land station Land Station
Ice Conditions

There is no ice forecast issued for this area.

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No watches or warnings in effect.

Synopsis

Technical Marine Synopsis

Issued 3:00 AM EDT 18 August 2026 Today Tonight and Wednesday At 3:00 a.m. EDT today ridge located from Montréal to Lake
Saint-Jean.
By 8:00 p.m. EDT tonight dissipating ridge located on a line
north-south over Labrador.

At 3:00 a.m. EDT today trough located on a line northeast-southwest
over Lake Superior.
By 8:00 p.m. EDT Wednesday trough located on a line
northeast-southwest over the Gaspe Peninsula.

Great Lakes - Lake Erie and Lake Ontario Area

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Marine Weather for Canada

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