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Cornwall to Montréal

Warnings

Forecast

Marine Forecast

Issued 03:00 AM EDT 08 August 2026

Today Tonight and Sunday.

Wind light becoming southwest 10 to 15 knots early this evening. Wind southwest 10 to 15 Sunday.

Scattered showers this afternoon tonight and Sunday morning. Risk of thunderstorms this afternoon and this evening. 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 PM EDT 07 August 2026
Sunday Wind southwest 10 to 15 knots.
Monday Wind southwest 15 to 20 knots.
Tuesday Wind west 10 to 15 knots.

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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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land station Land Station
Ice Conditions

There is no ice forecast issued for this area.

Warnings

No watches or warnings in effect.

Synopsis

Technical Marine Synopsis

Issued 3:00 AM EDT 8 August 2026 Today Tonight and Sunday At 3:00 a.m. EDT today ridge located from Lake Ontario to Labrador.
By 2:00 p.m. EDT today ridge located from the Quebec Lower North
Shore to Sept-Îles.

At 3:00 a.m. EDT today trough located on a line north-south over
Hudson Bay.
By 8:00 p.m. EDT Sunday trough located from Hudson Bay to New
Brunswick.

Great Lakes - Lake Erie and Lake Ontario Area

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Marine Weather for Canada

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