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Cornwall to Montréal

Warnings

Forecast

Marine Forecast

Issued 03:00 AM EDT 09 August 2026

Today Tonight and Monday.

Wind southwest 10 to 15 knots becoming light near midnight. Wind light Monday.

Scattered showers ending this morning with a risk of thunderstorms. Scattered showers Monday afternoon and evening with a risk of thunderstorms. Visibility as low as 1 mile in showers.

Extended Forecast

Issued 06:00 AM EDT 09 August 2026
Tuesday Wind west 10 to 20 knots.
Wednesday Wind southwest 10 to 15 knots.
Thursday Wind light.

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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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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 9 August 2026 Today Tonight and Monday At 3:00 a.m. EDT today trough located on a line north-south over
central Quebec.
By 8:00 p.m. EDT Monday trough located from Labrador to Sept-Îles.

At 3:00 a.m. EDT today ridge located on a line north-south over
the Midwestern states.
By 11:00 a.m. EDT Monday departing ridge located from New England
to Lake Saint-Jean.

Great Lakes - Lake Erie and Lake Ontario Area

Another Region

Marine Weather for Canada

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