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Cornwall to Montréal

Warnings

Forecast

Marine Forecast

Issued 03:00 PM EDT 20 July 2026

Tonight and Tuesday.

Wind southwest 10 to 15 knots becoming light near midnight then increasing to southerly 15 early Tuesday morning. Wind increasing to south 15 to 20 early Tuesday afternoon.

Showers Tuesday late in the day with a risk of thunderstorms. Visibility as low as 1 mile in showers.

Extended Forecast

Issued 06:00 PM EDT 20 July 2026
Wednesday Wind south 15 knots increasing to southwest 15 to 25 in the afternoon.
Thursday Wind southwest 15 to 20 knots diminishing to southwest 10 to 15 late in the day.
Friday Wind southwest 10 to 15 knots.

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Map of Great Lakes - Lake Huron marine weather areas Wiarton Airport Western Islands Cove Island Goderich Lake Simcoe Regional Airport Vineland Station Parry Sound Harbour Sarnia Chris Hadfield Airport Tobermory Muskoka Airport Harrow AAFC Long Point Port Weller St. Catharines / Niagara District Airport Lagoon City Southeast Shoal Burlington Lift Bridge Welland-Pelham Windsor Airport Port Colborne Erieau Peterborough Municipal Airport CFB Trenton Toronto City Centre Airport Point Petre Oshawa Executive Airport Hamilton Munro Int'l Airport Point Pelee Cobourg Port Colborne - 45142 North Channel - 45154 Ajax - 45159 Lake Nipissing - 45152 Sault Ste. Marie Airport Killarney Lake Simcoe - 45151 Greater Sudbury Airport South Lake Huron - 45149 Lake St Clair - 45147 North Bay Airport South Georgian Bay - 45143 Gore Bay-Manitoulin Airport Grimsby - 45139 Georgian Bay - 45137 Great Duck Island Collingwood Kingston Airport Grenadier Island Brockville Prince Edward Point - 45135 Port Stanley - 45132
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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 PM EDT 20 July 2026 Tonight and Tuesday At 3:00 p.m. EDT today departing low 990 mb located off Labrador.

At 3:00 p.m. EDT today ridge located on a line north-south over
Cornwall.
By 8:00 p.m. EDT Tuesday dissipating ridge located from Newfoundland
to Natashquan.

At 8:00 p.m. EDT tonight trough located on a line north-south over
Lake Superior.
By 8:00 p.m. EDT Tuesday trough located on a line north-south over
Lake Ontario.

Great Lakes - Lake Huron Area

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Marine Weather for Canada

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