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Cornwall to Montréal

Warnings

Forecast

Marine Forecast

Issued 03:00 PM EDT 18 May 2026

Tonight and Tuesday.

Gale warning in effect.

Wind light increasing to southwest 10 to 15 knots early Tuesday morning and to southwest 15 to 25 late Tuesday morning. Wind increasing to southwest 25 to 35 Tuesday afternoon.

Showers overnight Tuesday morning and Tuesday evening.

Extended Forecast

Issued 06:00 AM EDT 18 May 2026
Wednesday Wind southwest 20 to 30 knots veering to northwest 15 to 25 in the afternoon.
Thursday Wind northwest 10 to 15 knots becoming light.
Friday Wind light becoming southwest 10 to 15 knots.

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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)

Gale warning in effect

Cornwall to Montréal

Issued 3:00 PM EDT 18 May 2026

'Gale' force winds of 34 to 47 knots are occurring or expected to occur in this marine area. Watch for updated statements. Please refer to the latest marine forecasts for further details and continue to monitor the situation through Canadian Coast Guard radio or Weatheradio stations.

Synopsis

Technical Marine Synopsis

Issued 3:00 PM EDT 18 May 2026 Tonight and Tuesday At 3:00 p.m. EDT today ridge located from Hudson Bay to Sept-Îles.
By 8:00 p.m. EDT Tuesday ridge located on a line northwest-southeast
over the Strait of Belle Isle.

At 3:00 p.m. EDT today low 1008 mb located north of the Great Lakes.
By 8:00 p.m. EDT Tuesday low 998 mb located west of Lake Saint-Jean.

Great Lakes - Lake Huron Area

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Marine Weather for Canada

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