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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 Huron marine weather areas Wiarton Airport Western Islands Cove Island Goderich Lake Simcoe Regional Airport Vineland Station Parry Sound Harbour Sarnia Chris Hadfield Airport Tobermory Muskoka Airport Harrow AAFC Long Point Port Weller St. Catharines / Niagara District Airport Lagoon City Southeast Shoal Burlington Lift Bridge Welland-Pelham Windsor Airport Port Colborne Erieau Peterborough Municipal Airport CFB Trenton Toronto City Centre Airport Point Petre Oshawa Executive Airport Hamilton Munro Int'l Airport Point Pelee Cobourg Port Colborne - 45142 North Channel - 45154 Ajax - 45159 Lake Nipissing - 45152 Sault Ste. Marie Airport Killarney Lake Simcoe - 45151 Greater Sudbury Airport South Lake Huron - 45149 Lake St Clair - 45147 North Bay Airport South Georgian Bay - 45143 Gore Bay-Manitoulin Airport Grimsby - 45139 Georgian Bay - 45137 Great Duck Island Collingwood Kingston Airport Grenadier Island Brockville Prince Edward Point - 45135 Port Stanley - 45132
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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 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.

Watches (Ended)

Squall watch ended

Cornwall to Montréal

Issued 8:18 PM EDT 21 July 2026
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 Huron Area

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Marine Weather for Canada

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