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Cornwall to Montréal

Warnings

Forecast

Marine Forecast

Issued 03:00 AM EDT 15 April 2026

Today Tonight and Thursday.

Wind light becoming southwest 10 to 15 knots overnight then becoming light near noon Thursday.

Periods of drizzle changing to showers near noon then to periods of drizzle this evening and ending Thursday morning. Showers Thursday afternoon and evening. Fog banks dissipating this morning. Fog banks forming this evening and dissipating Thursday afternoon. Visibility 1 mile or less in fog banks and as low as 1 mile in drizzle.

Extended Forecast

Issued 06:00 AM EDT 15 April 2026
Friday Wind light becoming northeast 15 knots late in the day.
Saturday Wind northeast 15 knots increasing to south 15 to 25.
Sunday Wind south 15 to 25 knots becoming west 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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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 15 April 2026 Today Tonight and Thursday At 3:00 a.m. EDT today departing high 1025 mb located over Labrador.

At 3:00 a.m. EDT today ridge from 1025 mb high located from Labrador
to Lake Saint-Jean.
By midnight EDT tonight departing ridge located on a line east-west
over the Quebec Lower North Shore.

At 8:00 p.m. EDT tonight building low 1004 mb located over the
Midwestern states.
By 8:00 p.m. EDT Thursday low 1004 mb located over eastern Ontario.

Great Lakes - Lake Erie and Lake Ontario Area

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Marine Weather for Canada

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