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Cornwall to Montréal

Warnings

Forecast

Marine Forecast

Issued 03:35 PM EDT 17 May 2026

Tonight and Monday.

Wind northwest 10 to 20 knots becoming light early this evening then becoming northeast 10 to 15 late overnight. Wind becoming light Monday morning.

Showers Monday morning with a risk of thunderstorms.

Extended Forecast

Issued 06:00 PM EDT 17 May 2026
Tuesday Wind southwest 15 knots increasing to southwest 20 to 30 in the morning.
Wednesday Wind southwest 20 to 30 knots veering to northwest 15 to 25.
Thursday Wind light.

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Map of Great Lakes - Lake Erie and Lake Ontario marine weather areas CFB Trenton Port Colborne - 45142 Hamilton Munro Int'l Airport Oshawa Executive Airport Port Stanley - 45132 Lake Nipissing - 45152 Point Petre Georgian Bay - 45137 Toronto City Centre Airport Lake Simcoe - 45151 South Georgian Bay - 45143 Prince Edward Point - 45135 Peterborough Municipal Airport South Lake Huron - 45149 Collingwood Lake St Clair - 45147 Grimsby - 45139 Goderich Lagoon City Kingston Airport Muskoka Airport Parry Sound Harbour Grenadier Island Lake Simcoe Regional Airport Wiarton Airport Brockville Western Islands Cove Island Great Duck Island North Channel - 45154 Sarnia Chris Hadfield Airport Gore Bay-Manitoulin Airport Tobermory Harrow AAFC Long Point North Bay Airport Port Weller St. Catharines / Niagara District Airport Greater Sudbury Airport Southeast Shoal Vineland Station Port Colborne Erieau Cobourg Sault Ste. Marie Airport Windsor Airport Welland-Pelham Killarney Ajax - 45159 Point Pelee Burlington Lift Bridge
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buoy Buoy
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 PM EDT 17 May 2026 Tonight and Monday At 3:00 p.m. EDT today cold front located on a line
northeast-southwest over Natashquan.
By 2:00 a.m. EDT Monday departing cold front located on a line
northeast-southwest over the Strait of Belle Isle.

At 3:00 p.m. EDT today ridge located from James Bay to Québec city.
By 8:00 p.m. EDT Monday ridge located from Hudson Bay to
Newfoundland.

At 5:00 a.m. EDT Monday low 1002 mb located over the Midwestern
states.
By 8:00 p.m. EDT Monday low 1009 mb located over western Quebec.

Great Lakes - Lake Erie and Lake Ontario Area

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Marine Weather for Canada

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