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Cornwall to Montréal

Warnings

Forecast

Marine Forecast

Issued 03:00 AM EDT 19 April 2026

Today Tonight and Monday.

Wind west 20 to 30 knots diminishing to west 15 this morning and to light early this evening. Wind becoming northwest 10 to 15 near midnight then becoming light Monday evening.

Rain ending near noon.

Temperatures plus 14 falling to minus 2 overnight.

Extended Forecast

Issued 06:00 PM EDT 18 April 2026
Monday Wind west 15 knots diminishing to light late in the day.
Tuesday Wind light becoming southwest 10 to 15 knots late in the day.
Wednesday Wind light.

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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 AM EDT 19 April 2026 Today Tonight and Monday At 3:00 a.m. EDT today departing high 1030 mb located off
Newfoundland.

At 3:00 a.m. EDT today trough located on a line north-south over
Montréal.
By 6:00 a.m. EDT Monday departing trough located on a line
north-south over the Gulf of St. Lawrence.

At 3:00 a.m. EDT today high 1028 mb located over Manitoba.
By 8:00 p.m. EDT Monday high 1030 mb located over southern Ontario.

Great Lakes - Lake Huron Area

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Marine Weather for Canada

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