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Cornwall to Montréal

Warnings

Forecast

Marine Forecast

Issued 03:00 PM EDT 21 July 2026

Tonight and Wednesday.

Strong wind warning in effect.

Wind south 15 to 25 knots becoming southwest 15 late this evening then increasing to southwest 15 to 25 early Wednesday morning. Wind becoming west 15 Wednesday evening.

Showers ending Wednesday morning. Risk of thunderstorms late this afternoon and this evening.

Extended Forecast

Issued 06:00 PM EDT 21 July 2026
Thursday Wind west 15 knots.
Friday Wind southwest 15 knots.
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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land station Land Station
Ice Conditions

There is no ice forecast issued for this area.

Warnings

Warnings (In effect)

Strong wind warning in effect

Cornwall to Montréal

Issued 10:32 PM EDT 21 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 21 July 2026 Tonight and Wednesday At 3:00 p.m. EDT today low 990 mb located over James Bay.
By 8:00 p.m. EDT Wednesday low 994 mb located over northern Quebec.

At 7:00 a.m. EDT Wednesday cold front from low located over
Montréal.
By 8:00 p.m. EDT Wednesday cold front from low located over
Pointe-des-Monts.

Great Lakes - Lake Erie and Lake Ontario Area

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Marine Weather for Canada

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