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Cornwall to Montréal

Warnings

Forecast

Marine Forecast

Issued 03:00 AM EDT 21 June 2025

Today Tonight and Sunday.

Wind light increasing to southeast 10 to 15 knots early this evening and to southwest 15 to 20 near midnight. Wind diminishing to west 10 to 15 Sunday afternoon then becoming light Sunday evening.

Showers overnight and Sunday morning with a risk of thunderstorms. Scattered showers Sunday evening. Visibility as low as 1 mile in showers.

Extended Forecast

Issued 06:00 PM EDT 20 June 2025
Sunday Wind southwest 10 to 15 knots.
Monday Wind light.
Tuesday Wind southwest 10 to 20 knots.

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Map of Great Lakes - Lake Erie and Lake Ontario marine weather areas Harrow AAFC Burlington Lift Bridge Oshawa Executive Airport Point Pelee Peterborough Municipal Airport Point Petre Hamilton Munro Int'l Airport Erieau Cobourg Toronto City Centre Airport Port Colborne CFB Trenton South Lake Huron - 45149 Windsor Airport Great Duck Island 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 Welland-Pelham Lake St Clair - 45147 South Georgian Bay - 45143 Port Colborne - 45142 Grimsby - 45139 Georgian Bay - 45137 Prince Edward Point - 45135 Port Stanley - 45132 Vineland Station Brockville Grenadier Island Kingston Airport Collingwood Lagoon City Muskoka Airport Parry Sound Harbour Lake Simcoe Regional Airport Wiarton Airport Cove Island Goderich Sarnia Chris Hadfield Airport Western Islands Tobermory Long Point Port Weller St. Catharines / Niagara District Airport Southeast Shoal
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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 21 June 2025 Today Tonight and Sunday At 3:00 a.m. EDT today low 995 mb located near Gaspé.
By 5:00 a.m. EDT Sunday low 998 mb located off Labrador.

At 3:00 a.m. EDT today ridge located from James Bay to Lake Ontario.
By 8:00 p.m. EDT Sunday weakening ridge located on a line
north-south over Newfoundland.

At 8:00 p.m. EDT tonight low located over southern James Bay.
By 8:00 p.m. EDT Sunday weakening low located over New Brunswick.

Great Lakes - Lake Erie and Lake Ontario Area

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Marine Weather for Canada

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