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Cornwall to Montréal

Warnings

Forecast

Marine Forecast

Issued 03:00 AM EDT 20 July 2025

Today Tonight and Monday.

Wind light becoming southwest 10 to 15 knots early this morning then veering to northwest 10 to 15 this afternoon. Wind northwest 10 to 15 tonight. Wind north 10 to 15 Monday.

Scattered showers ending near midnight.

Extended Forecast

Issued 06:00 PM EDT 19 July 2025
Monday Wind northerly 15 knots.
Tuesday Wind light.
Wednesday Wind light.

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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 AM EDT 20 July 2025 Today Tonight and Monday At 3:00 a.m. EDT today trough located on a line northeast-southwest
over northwestern Quebec.
By 8:00 p.m. EDT Monday trough located on a line northeast-southwest
over Newfoundland.

At 3:00 a.m. EDT today high located on a line north-south over
Manitoba.
By 8:00 p.m. EDT Monday high located on a line north-south over
Lake Ontario.

Great Lakes - Lake Erie and Lake Ontario Area

Another Region

Marine Weather for Canada

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