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Cornwall to Montréal

Warnings

Forecast

Marine Forecast

Issued 10:08 AM EDT 28 July 2026

Today Tonight and Wednesday.

Wind light with gusts to 45 knots near thunderstorms today and early this evening. Wind light Wednesday.

Showers. Risk of thunderstorms this afternoon and this evening. Visibility as low as 1 mile in showers.

Extended Forecast

Issued 06:00 AM EDT 28 July 2026
Thursday Wind northeast 10 to 15 knots.
Friday Wind light.
Saturday Wind light.

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

There is no ice forecast issued for this area.

Warnings

Watches (In effect)

Squall watch in effect

Cornwall to Montréal

Issued 10:04 AM EDT 28 July 2026 This afternoon and this evening, conditions will be favourable for the development of squalls with wind gusts up to 45 knots, frequent lightning, hail and poor to very poor visibility due to 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 AM EDT 28 July 2026 Today Tonight and Wednesday At 3:00 a.m. EDT today trough located from Lake Michigan to
Labrador.
By 8:00 p.m. EDT Wednesday quasi-stationary trough located over
Montréal to Sept-Îles.

Great Lakes - Lake Huron Area

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Marine Weather for Canada

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