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Cornwall to Montréal

Warnings

Forecast

Marine Forecast

Issued 03:00 PM EDT 12 June 2026

Tonight and Saturday.

Strong wind warning in effect.

Wind southwest 15 to 25 knots with gusts to 50 near thunderstorms late this afternoon. Wind becoming west 10 to 15 near midnight then increasing to west 15 to 25 near noon Saturday. Wind diminishing to west 10 to 15 Saturday evening.

Showers ending this evening with a risk of thunderstorms. Visibility as low as 1 mile in showers.

Extended Forecast

Issued 06:00 PM EDT 12 June 2026
Sunday Wind southwesterly 15 knots increasing to southwest 15 to 25 in the afternoon.
Monday Wind southwest 15 knots.
Tuesday Wind 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)

Strong wind warning in effect

Cornwall to Montréal

Issued 3:00 PM EDT 12 June 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 (In effect)

Squall watch in effect

Cornwall to Montréal

Issued 12:03 PM EDT 12 June 2026 This afternoon and evening, conditions are favourable for the development of squalls with wind gusts of up to 50 knots, numerous lightning strikes and poor to very poor visibilities due to rain showers at times heavy.

Proceed with caution as visibility may suddenly be reduced to near-zero. Vessels without lightning protection should make their way to shore immediately. Mariners are advised to prepare for potential squalls. Vulnerable vessels are most at risk and should seek safe harbour if underway. Consider delaying or postponing travel in areas under the Squall Watch.

Please continue to monitor alerts and forecasts issued by Environment Canada. For more information monitor Canadian Coast Guard radio or Weatheradio stations.

Synopsis

Technical Marine Synopsis

Issued 3:00 PM EDT 12 June 2026 Tonight and Saturday At 3:00 p.m. EDT today dissipating trough located on a line
north-south over Québec city.

At 3:00 p.m. EDT today trough located on a line north-south over
western Quebec.
By 8:00 p.m. EDT Saturday trough located on a line
northwest-southeast over Rimouski.

Great Lakes - Lake Huron Area

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Marine Weather for Canada

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