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Cornwall to Montréal

Warnings

Forecast

Marine Forecast

Issued 03:00 AM EDT 09 September 2026

Today Tonight and Thursday.

Strong wind warning in effect.

Wind light increasing to southwest 20 knots this afternoon then veering to west 20 to 25 Thursday morning. Wind diminishing to northwest 15 Thursday evening.

Showers today and this evening. Visibility as low as 1 mile in showers.

Extended Forecast

Issued 06:00 PM EDT 08 September 2026
Thursday Wind southwest 15 to 25 knots veering to west 15 to 20 in the afternoon.
Friday Wind northwest 15 knots diminishing to light late in the day.
Saturday Wind light becoming south 15 knots late in the day.

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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 09 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 9 September 2026 Today Tonight and Thursday At 3:00 a.m. EDT today ridge located from New England to Ungava Bay.
By 8:00 p.m. EDT tonight departing ridge located over Newfoundland.

At 3:00 a.m. EDT today trough located on a line north-south over
northwestern Ontario.
By 8:00 p.m. EDT Thursday trough located from the Quebec Lower
North Shore to Nova Scotia.

Great Lakes - Lake Erie and Lake Ontario Area

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Marine Weather for Canada

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