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Cornwall to Montréal

Warnings

Forecast

Marine Forecast

Issued 03:00 PM EDT 16 July 2025

Tonight and Thursday.

Strong wind warning in effect.

Wind southwest 10 to 15 knots becoming light this evening then increasing to southwest 15 near noon Thursday. Wind increasing to southwest 20 to 30 Thursday afternoon.

Showers overnight and Thursday with a risk of thunderstorms. Visibility 1 mile or less in showers.

Extended Forecast

Issued 06:00 PM EDT 16 July 2025
Friday Wind northwest 15 knots backing to southwest 10 to 15 in the afternoon.
Saturday Wind light becoming southwest 10 to 15 knots.
Sunday Wind light becoming northwest 10 to 15 knots.

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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 10:06 PM EDT 16 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.

Synopsis

Technical Marine Synopsis

Issued 3:00 PM EDT 16 July 2025 Tonight and Thursday At 3:00 p.m. EDT today ridge located on a line northwest-southeast
over Havre Saint-Pierre.
By 8:00 p.m. EDT tonight weakening ridge located on a line
northwest-southeast over the Quebec Lower North Shore.

At 3:00 p.m. EDT today warm front from low located on a line
east-west over Lake Superior.
By 8:00 p.m. EDT Thursday low 998 mb located north of Québec city.

Great Lakes - Lake Huron Area

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Marine Weather for Canada

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