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Cornwall to Montréal

Warnings

Forecast

Marine Forecast

Issued 03:00 AM EDT 20 June 2025

Today Tonight and Saturday.

Strong wind warning in effect.

Wind southwest 15 to 25 knots veering to northwesterly 15 to 25 early this morning then diminishing to west 10 to 15 early this evening. Wind becoming light Saturday morning then becoming southeast 10 to 15 Saturday evening.

Showers Saturday evening with a risk of thunderstorms. Fog banks dissipating early this morning. Visibility 1 mile or less in fog banks and as low as 1 mile in showers.

Extended Forecast

Issued 06:00 AM EDT 20 June 2025
Sunday Wind southwest 10 to 15 knots.
Monday Wind southwest 10 to 15 knots.
Tuesday Wind southwest 10 to 20 knots veering to northwest 15 late in the day.

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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 06:32 AM EDT 20 June 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 AM EDT 20 June 2025 Today Tonight and Saturday At 3:00 a.m. EDT today low 998 mb located over Rivière-du-Loup.
By 8:00 p.m. EDT Saturday low 995 mb located off Labrador.

At 3:00 a.m. EDT today ridge located from James Bay to the Great
Lakes.
By 8:00 p.m. EDT Saturday ridge located over Québec city.

Great Lakes - Lake Huron Area

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Marine Weather for Canada

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