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Cornwall to Montréal

Warnings

Forecast

Marine Forecast

Issued 03:00 AM EDT 16 July 2026

Today Tonight and Friday.

Strong wind warning in effect.

Wind west 10 to 15 knots increasing to northwest 20 to 30 late this morning then diminishing to northwest 10 to 15 this evening. Wind becoming light Friday evening.

Scattered showers today with a risk of thunderstorms.

Extended Forecast

Issued 06:00 AM EDT 16 July 2026
Saturday Wind light.
Sunday Wind northwest 10 to 20 knots.
Monday 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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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 03:00 AM EDT 16 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 (In effect)

Squall watch in effect

Cornwall to Montréal

Issued 10:20 AM EDT 16 July 2026 Until late this afternoon, conditions are favourable for the formation of squalls accompanied by gusts of up to 35 knots.

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 8:25 AM EDT 16 July 2026 Today Tonight and Friday At 3:00 a.m. EDT today low 987 mb located over Labrador.
By 8:00 p.m. EDT Friday low 997 mb located over Labrador.

At 3:00 a.m. EDT today ridge located on a line north-south over
northwestern Ontario.
By 8:00 p.m. EDT Friday ridge located on a line north-south over
the Great Lakes.

Great Lakes - Lake Huron Area

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Marine Weather for Canada

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