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Cornwall to Montréal

Warnings

Forecast

Marine Forecast

Issued 03:00 AM EDT 21 April 2026

Today Tonight and Wednesday.

Wind light becoming southwest 10 to 15 knots near noon then diminishing to light early this evening. Wind light Wednesday.

High today plus 6. Low tonight minus 2. High Wednesday plus 11.

Extended Forecast

Issued 06:00 AM EDT 21 April 2026
Thursday Wind light becoming north 10 to 15 knots in the afternoon.
Friday Wind light.
Saturday 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 AM EDT 21 April 2026 Today Tonight and Wednesday At 3:00 a.m. EDT today ridge located on a line north-south over
Rimouski.
By 8:00 p.m. EDT Wednesday ridge located on a line north-south
over Anticosti Island.

At 8:00 p.m. EDT tonight trough located on a line
northeast-southwest over James Bay.
By 8:00 p.m. EDT Wednesday trough located on a line north-south
over Lake Saint-Jean.

Great Lakes - Lake Erie and Lake Ontario Area

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Marine Weather for Canada

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