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Cornwall to Montréal

Warnings

Forecast

Marine Forecast

Issued 03:00 AM EDT 15 March 2026

Today Tonight and Monday.

Wind light increasing to northeast 15 knots this afternoon and to southeast 20 to 30 near midnight. Wind veering to southwest 20 to 30 Monday evening.

Snow this afternoon and this evening. Rain Monday evening. Visibility 1 mile or less in snow.

Temperatures minus 4 falling to minus 9 this morning then rising to plus 13 Monday evening.

Extended Forecast

Issued 06:00 PM EDT 14 March 2026
Monday Wind southeast 15 to 25 knots.
Tuesday Wind southwest 25 to 35 knots diminishing to west 15 to 25 late in the day.
Wednesday Wind west 15 to 25 knots diminishing to westerly 10 to 15.

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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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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 15 March 2026 Today Tonight and Monday At 3:00 a.m. EDT today departing low 996 mb located near
Newfoundland.

At 3:00 a.m. EDT today ridge located on a line north-south over
western Québec city.
By 4:00 p.m. EDT Monday ridge located on a line northwest-southeast
over Newfoundland.

At 4:00 p.m. EDT today low 991 mb located over the Midwestern
states.
By 8:00 p.m. EDT Monday low 988 mb located over southwestern Quebec.

Great Lakes - Lake Erie and Lake Ontario Area

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Marine Weather for Canada

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