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Cornwall to Montréal

Warnings

Forecast

Marine Forecast

Issued 03:00 AM EDT 12 May 2026

Today Tonight and Wednesday.

Wind light becoming west 10 to 15 knots early this afternoon then diminishing to light early this evening. Wind increasing to southeast 15 to 20 Wednesday morning.

Rain Wednesday afternoon and evening.

Extended Forecast

Issued 06:00 AM EDT 12 May 2026
Thursday Wind southeast 15 to 20 knots backing to northeast 10 to 15 late in the day.
Friday Wind northeast 10 to 15 knots becoming light.
Saturday Wind light increasing to southwest 15 to 25 knots.

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Map of Great Lakes - Lake Huron marine weather areas Wiarton Airport Western Islands Cove Island Goderich Lake Simcoe Regional Airport Vineland Station Parry Sound Harbour Sarnia Chris Hadfield Airport Tobermory Muskoka Airport Harrow AAFC Long Point Port Weller St. Catharines / Niagara District Airport Lagoon City Southeast Shoal Burlington Lift Bridge Welland-Pelham Windsor Airport Port Colborne Erieau Peterborough Municipal Airport CFB Trenton Toronto City Centre Airport Point Petre Oshawa Executive Airport Hamilton Munro Int'l Airport Point Pelee Cobourg Port Colborne - 45142 North Channel - 45154 Ajax - 45159 Lake Nipissing - 45152 Sault Ste. Marie Airport Killarney Lake Simcoe - 45151 Greater Sudbury Airport South Lake Huron - 45149 Lake St Clair - 45147 North Bay Airport South Georgian Bay - 45143 Gore Bay-Manitoulin Airport Grimsby - 45139 Georgian Bay - 45137 Great Duck Island Collingwood Kingston Airport Grenadier Island Brockville Prince Edward Point - 45135 Port Stanley - 45132
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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 12 May 2026 Today Tonight and Wednesday At 3:00 a.m. EDT today ridge located on a line north-south over
western Quebec.
By 8:00 p.m. EDT Wednesday ridge located on a line
northwest-southeast over Sept-Îles.

At 8:00 a.m. EDT Wednesday low 1003 mb located over Lake Huron.
By 8:00 p.m. EDT Wednesday low 1004 mb located east of Lake Huron.

Great Lakes - Lake Huron Area

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Marine Weather for Canada

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