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Cornwall to Montréal

Warnings

Forecast

Marine Forecast

Issued 03:00 PM EDT 15 July 2025

Tonight and Wednesday.

Wind southwest 10 to 15 knots becoming light this evening then becoming southwest 10 to 15 Wednesday morning. Wind becoming light Wednesday evening.

Extended Forecast

Issued 06:00 AM EDT 15 July 2025
Thursday Wind light increasing to southwest 15 to 20 knots in the afternoon.
Friday Wind northwest 10 to 15 knots backing to southwest 10 to 15.
Saturday 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
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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 EDT 15 July 2025 Tonight and Wednesday At 3:00 p.m. EDT today trough located on a line northeast-southwest
over Havre Saint-Pierre.
By 2:00 a.m. EDT Wednesday departing trough located on a line
northeast-southwest over the Quebec Lower North Shore.

At 3:00 p.m. EDT today ridge located over northwestern Quebec.
By 8:00 p.m. EDT Wednesday weakening ridge located on a line
northwest-southeast over Sept-Îles.

At 3:00 p.m. EDT today approaching warm front located on a line
east-west over Lake Superior.

Great Lakes - Lake Erie and Lake Ontario Area

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Marine Weather for Canada

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