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Cornwall to Montréal

Warnings

Forecast

Marine Forecast

Issued 03:00 PM EDT 18 July 2026

Tonight and Sunday.

Strong wind warning in effect.

Wind southeasterly 15 knots becoming southwest 10 to 20 late this afternoon then veering to northwest 15 to 25 this evening. Wind becoming westerly 15 Sunday evening.

Showers ending near midnight with a risk of thunderstorms. Visibility as low as 1 mile in showers.

Extended Forecast

Issued 06:00 PM EDT 18 July 2026
Monday Wind southwest 10 to 15 knots.
Tuesday Wind southwest 10 to 15 knots increasing to southerly 15 to 25.
Wednesday Wind south 15 knots increasing to southwest 15 to 25 late in the day.

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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

Warnings (In effect)

Strong wind warning in effect

Cornwall to Montréal

Issued 3:00 PM EDT 18 July 2026

'Strong' winds of 20 to 33 knots are occurring or expected to occur in this marine area. Please refer to the latest marine forecasts for further details and continue to monitor the situation through Canadian Coast Guard radio.

Synopsis

Technical Marine Synopsis

Issued 3:00 PM EDT 18 July 2026 Tonight and Sunday At 3:00 p.m. EDT today ridge located on a line northwest-southeast
over Anticosti Island.
By 8:00 a.m. EDT Sunday dissipating ridge located on a line
northwest-southeast over the Strait of Belle Isle.

At 3:00 p.m. EDT today low 998 mb located northwest of Montréal.
By 8:00 p.m. EDT Sunday low 986 mb located over western Anticosti
Island.

At 8:00 p.m. EDT tonight ridge located on a line north-south over
Lake Superior.
By 8:00 p.m. EDT Sunday ridge located on a line north-south over
Lake Huron.

Great Lakes - Lake Erie and Lake Ontario Area

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Marine Weather for Canada

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