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Cornwall to Montréal

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Marine Forecast

Issued 03:00 PM EST 07 December 2025

Tonight and Monday.

Wind easterly 10 to 15 knots becoming westerly 15 this evening. Wind westerly 15 Monday.

Snow ending near midnight. Visibility as low as 1 mile in snow.

Temperatures near minus 11.

Extended Forecast

Issued 06:00 PM EST 07 December 2025
Tuesday Wind light.
Wednesday Wind light becoming northeast 10 to 15 knots late in the day.
Thursday Wind northeast 15 knots backing to northwest 10 to 15.

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Map of Great Lakes - Lake Erie and Lake Ontario marine weather areas Harrow AAFC Burlington Lift Bridge Oshawa Executive Airport Point Pelee Peterborough Municipal Airport Point Petre Hamilton Munro Int'l Airport Erieau Cobourg Toronto City Centre Airport Port Colborne CFB Trenton South Lake Huron - 45149 Windsor Airport Great Duck Island 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 Welland-Pelham Lake St Clair - 45147 South Georgian Bay - 45143 Port Colborne - 45142 Grimsby - 45139 Georgian Bay - 45137 Prince Edward Point - 45135 Port Stanley - 45132 Vineland Station Brockville Grenadier Island Kingston Airport Collingwood Lagoon City Muskoka Airport Parry Sound Harbour Lake Simcoe Regional Airport Wiarton Airport Cove Island Goderich Sarnia Chris Hadfield Airport Western Islands Tobermory Long Point Port Weller St. Catharines / Niagara District Airport Southeast Shoal
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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 PM EST 7 December 2025 Tonight and Monday At 3:00 p.m. EST today trough located on a line north-south over
the Quebec Lower North Shore.
By 3:00 a.m. EST Monday dissipating trough located on a line
northeast-southwest over Newfoundland.

At 3:00 p.m. EST today ridge located from Lake Huron to Lake
Saint-Jean.
By 7:00 p.m. EST Monday ridge located from Lake Ontario to Québec
city.

Great Lakes - Lake Erie and Lake Ontario Area

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Marine Weather for Canada

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