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Lake St. Clair

Warnings

Forecast

Marine Forecast

Issued 06:30 PM EDT 21 July 2026

Tonight and Wednesday.

Strong wind warning in effect.

Wind west 15 knots increasing to northwest 20 this evening then diminishing to northwest 15 early Wednesday morning. Wind diminishing to northwest 10 near noon Wednesday then veering to north 10 Wednesday evening.

Scattered showers this evening with a risk of thunderstorms.

Waves

Issued 06:30 PM EDT 21 July 2026
Tonight and Wednesday. Waves 0.5 metres or less building to 0.5 to 1 near midnight then subsiding to 0.5 or less Wednesday morning.

Extended Forecast

Issued 06:30 PM EDT 21 July 2026
Thursday Wind light.
Friday Wind light.
Saturday Wind light becoming west 10 to 15 knots.

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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
Legend:
buoy Buoy
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

Warnings (In effect)

Strong wind warning in effect

Lake St. Clair

Issued 00:04 AM EDT 22 July 2026

'Strong' winds of 20 to 33 knots are occurring or expected to occur in this marine area. Please refer to the latest marine forecasts for further details and continue to monitor the situation through Canadian Coast Guard radio.

Synopsis

Technical Marine Synopsis

Issued 6:30 PM EDT 21 July 2026 Tonight and Wednesday At 6:30 p.m. EDT tonight trough from 991 mb low located on a line
north-south over Lake Simcoe.
By 6:30 p.m. EDT Wednesday trough from 993 mb low located on a
line north-south over Maine.

At 6:30 p.m. EDT tonight ridge located on a line northwest-southeast
over North Dakota.
By 6:30 p.m. EDT Wednesday ridge located on a line
northwest-southeast over Wisconsin.

Great Lakes - Lake Erie and Lake Ontario Area

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Marine Weather for Canada

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