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Lake St. Clair

Warnings

Forecast

Marine Forecast

Issued 10:30 AM EDT 17 July 2026

Today Tonight and Saturday.

Wind light becoming southeast 10 knots this afternoon then increasing to southwest 15 near midnight. Wind becoming north 15 Saturday afternoon.

Scattered showers tonight and Saturday with a risk of thunderstorms. Smoke dissipating Saturday morning. Visibility as low as 1 mile in smoke.

Waves

Issued 10:30 AM EDT 17 July 2026
Today Tonight and Saturday. Waves less than 0.5 metres building to 0.5 late overnight.

Extended Forecast

Issued 03:00 AM EDT 17 July 2026
Sunday Wind north 15 knots diminishing to light in the morning.
Monday Wind light becoming southwest 15 knots late in the day.
Tuesday Wind southwest 15 knots veering to northwest 15 late in the day.

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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 10:30 AM EDT 17 July 2026 Today Tonight and Saturday At 10:30 a.m. EDT today ridge located on a line north-south over
southern Ontario.
By 10:30 a.m. EDT Saturday ridge located on a line
northeast-southwest over the Eastern Seaboard.

At 10:30 a.m. EDT today low 1010 mb located over northwestern
Ontario.
By 10:30 a.m. EDT Saturday low 999 mb located north of Lake
Nipissing.

Great Lakes - Lake Erie and Lake Ontario Area

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Marine Weather for Canada

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