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Cornwall to Montréal

Warnings

Forecast

Marine Forecast

Issued 03:00 AM EDT 12 September 2026

Today Tonight and Sunday.

Strong wind warning in effect.

Wind light increasing to southerly 10 to 15 knots early this afternoon and to southwest 15 to 25 Sunday morning. Wind becoming west 15 Sunday evening.

Scattered showers Sunday. Risk of thunderstorms Sunday morning and afternoon. Mist forming early this morning and dissipating late this morning. Visibility as low as 1 mile in mist.

Extended Forecast

Issued 06:00 AM EDT 12 September 2026
Monday Wind northwest 15 to 20 knots diminishing to light late in the day.
Tuesday Wind light becoming south 10 to 15 knots.
Wednesday Wind light.

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Map of Great Lakes - Lake Erie and Lake Ontario marine weather areas Harrow AAFC Hamilton Munro Int'l Airport CFB Trenton Erieau Toronto City Centre Airport Point Pelee Peterborough Municipal Airport Burlington Lift Bridge Point Petre Cobourg Oshawa Executive Airport South Lake Huron - 45149 Port Colborne Brockville Gore Bay-Manitoulin Airport North Bay Airport Greater Sudbury Airport Killarney Sault Ste. Marie Airport Ajax - 45159 North Channel - 45154 Lake Nipissing - 45152 Lake Simcoe - 45151 Windsor Airport Lake St Clair - 45147 South Georgian Bay - 45143 Port Colborne - 45142 Grimsby - 45139 Georgian Bay - 45137 Prince Edward Point - 45135 Port Stanley - 45132 Welland-Pelham Grenadier Island Kingston Airport Collingwood Lagoon City Muskoka Airport Parry Sound Harbour Lake Simcoe Regional Airport Wiarton Airport Western Islands Sarnia Chris Hadfield Airport Vineland Station Southeast Shoal St. Catharines / Niagara District Airport Goderich Port Weller Long Point Tobermory
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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 03:00 AM EDT 12 September 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.

Synopsis

Technical Marine Synopsis

Issued 3:00 AM EDT 12 September 2026 Today Tonight and Sunday At 3:00 a.m. EDT today ridge located from Lake Saint-Jean to
Cape Hatteras.
By 8:00 a.m. EDT Sunday departing ridge located off Newfoundland.

At 3:00 a.m. EDT today trough located on a line northeast-southwest
over Lake Superior.
By 8:00 p.m. EDT Sunday trough located on a line northeast-southwest
over Pointe-des-Monts.

Great Lakes - Lake Erie and Lake Ontario Area

Another Region

Marine Weather for Canada

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