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Lake St. Clair

Warnings

Forecast

Marine Forecast

Issued 06:19 AM EDT 22 July 2026

Today Tonight and Thursday.

Wind northwest 15 knots diminishing to northwest 10 near noon then veering to north 10 this evening. Wind becoming light late overnight. Wind light Thursday.

Waves

Issued 03:00 AM EDT 22 July 2026
Today Tonight and Thursday. Waves 0.5 to 1 metre subsiding to 0.5 or less this morning and to less than 0.5 Thursday morning.

Extended Forecast

Issued 03:00 AM EDT 22 July 2026
Friday Wind light.
Saturday Wind light becoming southwest 15 knots.
Sunday 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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land station Land Station
Ice Conditions

*Ice Forecast and Warnings also apply to U.S. waters

Ice Forecasts

Issued 12:00 PM EDT 17 May 2026 Forecasts have ended for the season.
Warnings

No watches or warnings in effect.

Synopsis

Technical Marine Synopsis

Issued 3:00 AM EDT 22 July 2026 Today Tonight and Thursday At 3:00 a.m. EDT today trough from 991 mb low located on a line
north-south over eastern Ontario.
By 3:00 a.m. EDT Thursday departing trough from 992 mb low located
on a line northwest-southeast over the Gulf of St. Lawrence.

At 3:00 a.m. EDT today ridge located on a line northwest-southeast
over Minnesota.
By 3:00 a.m. EDT Thursday ridge located on a line east-west over
southwestern Ontario.

Great Lakes - Lake Erie and Lake Ontario Area

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Marine Weather for Canada

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