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Cornwall to Montréal

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Marine Forecast

Issued 03:00 PM EST 12 December 2025

Tonight and Saturday.

Wind west 15 to 25 knots diminishing to southwest 10 to 15 early this evening and to light near midnight. Wind becoming southwest 10 to 15 Saturday evening.

Periods of snow Saturday. Visibility 1 mile or less in snow.

Low tonight minus 9. High Saturday minus 2.

Extended Forecast

Issued 06:00 AM EST 12 December 2025
Sunday Wind light becoming northwest 15 knots in the afternoon.
Monday Wind northwest 15 knots backing to southwest 15.
Tuesday Wind southwest 10 to 15 knots.

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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
Legend:
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 12 December 2025 Tonight and Saturday At 3:00 p.m. EST today ridge located on a line north-south over
Lake Huron.
By 7:00 p.m. EST Saturday ridge located from the Gaspe Peninsula
to James Bay.

At 3:00 p.m. EST today trough located on a line north-south over
western Lake Superior.
By 7:00 p.m. EST Saturday trough located on a line north-south
over Lake Ontario.

Great Lakes - Lake Erie and Lake Ontario Area

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Marine Weather for Canada

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