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Cornwall to Montréal

Warnings

Forecast

Marine Forecast

Issued 04:27 AM EDT 31 August 2026

Today Tonight and Tuesday.

Wind light becoming northeast 10 to 15 knots Tuesday morning.

Scattered showers overnight and Tuesday morning. Fog patches dissipating this morning.

Extended Forecast

Issued 06:00 AM EDT 31 August 2026
Wednesday Wind easterly 10 to 15 knots veering to southeast 15 to 20 in the morning.
Thursday Wind southeast 15 to 20 knots diminishing to light.
Friday Wind light becoming northwest 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.

Warnings

No watches or warnings in effect.

Synopsis

Technical Marine Synopsis

Issued 3:00 AM EDT 31 August 2026 Today Tonight and Tuesday At 3:00 a.m. EDT today trough located from the Quebec Lower North
Shore to Tadoussac.
By 8:00 p.m. EDT tonight departing trough located from the Quebec
Lower North Shore to Anticosti Island.

At 3:00 a.m. EDT today ridge located from the East Coast of the
U.S. to Hudson Bay.
By 8:00 p.m. EDT Tuesday high 1023 mb located near Labrador.

Great Lakes - Lake Erie and Lake Ontario Area

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Marine Weather for Canada

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