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Cornwall to Montréal

Warnings

Forecast

Marine Forecast

Issued 03:00 PM EDT 01 July 2025

Tonight and Wednesday.

Strong wind warning in effect.

Wind southwesterly 15 to 25 knots diminishing to light early this evening then increasing to westerly 15 to 20 early Wednesday morning. Wind diminishing to southwest 10 to 15 Wednesday evening.

Showers ending this evening with a risk of thunderstorms.

Extended Forecast

Issued 06:00 PM EDT 01 July 2025
Thursday Wind west 10 to 20 knots.
Friday Wind west 15 knots.
Saturday Wind light.

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Map of Great Lakes - Lake Huron marine weather areas Cove Island Goderich Oshawa Executive Airport CFB Trenton Western Islands Wiarton Airport Point Petre Lake Simcoe Regional Airport Parry Sound Harbour Toronto City Centre Airport Muskoka Airport Lagoon City Brockville Hamilton Munro Int'l Airport Sarnia Chris Hadfield Airport Tobermory Cobourg Harrow AAFC Long Point Port Weller Burlington Lift Bridge St. Catharines / Niagara District Airport Southeast Shoal Point Pelee Vineland Station Welland-Pelham Erieau Windsor Airport Port Colborne Killarney South Georgian Bay - 45143 Grimsby - 45139 Georgian Bay - 45137 Prince Edward Point - 45135 Port Stanley - 45132 Lake St Clair - 45147 South Lake Huron - 45149 Sault Ste. Marie Airport Lake Simcoe - 45151 Collingwood Greater Sudbury Airport North Bay Airport Kingston Airport Peterborough Municipal Airport Grenadier Island Port Colborne - 45142 Great Duck Island Ajax - 45159 Gore Bay-Manitoulin Airport North Channel - 45154 Lake Nipissing - 45152
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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 01 July 2025

'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 or Weatheradio stations.

Watches (In effect)

Squall watch in effect

Cornwall to Montréal

Issued 9:28 PM EDT 01 July 2025 Conditions are favourable for the development of squalls with wind gusts up to 35 knots.



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 1 July 2025 Tonight and Wednesday At 3:00 p.m. EDT today low 991 mb located northeast of James Bay.
By 8:00 p.m. EDT Wednesday low 988 mb located over Labrador Sea.

At 3:00 p.m. EDT today trough located on a line northeast-southwest
over western Quebec.
By 8:00 p.m. EDT Wednesday departing trough located on a line
northeast-southwest over the Quebec Lower North Shore.

Great Lakes - Lake Huron Area

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Marine Weather for Canada

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