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Cornwall to Montréal

Warnings

Forecast

Marine Forecast

Issued 03:00 PM EDT 23 April 2026

Tonight and Friday.

Wind northwest 15 to 20 knots veering to northerly 10 to 15 early this evening then becoming light near midnight. Wind becoming northeast 10 to 15 Friday evening.

Low tonight zero. High Friday plus 10.

Extended Forecast

Issued 06:00 PM EDT 23 April 2026
Saturday Wind northeast 10 to 15 knots.
Sunday Wind light.
Monday Wind light.

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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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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 23 April 2026 Tonight and Friday At 3:00 p.m. EDT today low 1001 mb located near the Strait of
Belle Isle.
By 5:00 a.m. EDT Friday dissipating low 1005 mb located over
Anticosti Island.

At 3:00 p.m. EDT today ridge located from Hudson Bay to Lake
Ontario.
By 8:00 p.m. EDT Friday ridge located from the Ungava Peninsula
to Montréal.

Great Lakes - Lake Erie and Lake Ontario Area

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Marine Weather for Canada

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