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Cornwall to Montréal

Warnings

Forecast

Marine Forecast

Issued 03:00 PM EDT 21 May 2026

Tonight and Friday.

Wind light tonight and Friday.

Extended Forecast

Issued 06:00 PM EDT 21 May 2026
Saturday Wind light becoming southeast 15 knots in the afternoon.
Sunday Wind southeast 20 knots.
Monday Wind southeast 10 to 15 knots veering to southwest 10 to 15.

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Map of Great Lakes - Lake Erie and Lake Ontario marine weather areas CFB Trenton Port Colborne - 45142 Hamilton Munro Int'l Airport Oshawa Executive Airport Port Stanley - 45132 Lake Nipissing - 45152 Point Petre Georgian Bay - 45137 Toronto City Centre Airport Lake Simcoe - 45151 South Georgian Bay - 45143 Prince Edward Point - 45135 Peterborough Municipal Airport South Lake Huron - 45149 Collingwood Lake St Clair - 45147 Grimsby - 45139 Goderich Lagoon City Kingston Airport Muskoka Airport Parry Sound Harbour Grenadier Island Lake Simcoe Regional Airport Wiarton Airport Brockville Western Islands Cove Island Great Duck Island North Channel - 45154 Sarnia Chris Hadfield Airport Gore Bay-Manitoulin Airport Tobermory Harrow AAFC Long Point North Bay Airport Port Weller St. Catharines / Niagara District Airport Greater Sudbury Airport Southeast Shoal Vineland Station Port Colborne Erieau Cobourg Sault Ste. Marie Airport Windsor Airport Welland-Pelham Killarney Ajax - 45159 Point Pelee Burlington Lift Bridge
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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 21 May 2026 Tonight and Friday At 3:00 p.m. EDT today departing low 989 mb located northwest of
the Strait of Belle Isle.

At 3:00 p.m. EDT today ridge located from Lake Superior to Québec
city.
By 8:00 p.m. EDT Friday ridge located from James Bay to New England.

Great Lakes - Lake Erie and Lake Ontario Area

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Marine Weather for Canada

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