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Lake St. Clair

Warnings

Forecast

Marine Forecast

Issued 06:30 PM EDT 16 August 2026

Tonight and Monday.

Wind west 10 knots increasing to northwest 15 near midnight then diminishing to northwest 10 near noon Monday. Wind becoming light Monday evening.

Scattered showers ending overnight with a risk of thunderstorms.

Waves

Issued 06:30 PM EDT 16 August 2026
Tonight and Monday. Waves less than 0.5 metres building to 0.5 late overnight then subsiding to less than 0.5 Monday afternoon.

Extended Forecast

Issued 06:30 PM EDT 16 August 2026
Tuesday Wind light.
Wednesday Wind southwest 15 knots diminishing to light.
Thursday Wind light.

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Map of Great Lakes - Lake Erie and Lake Ontario marine weather areas Harrow AAFC Hamilton Munro Int'l Airport CFB Trenton Erieau Toronto City Centre Airport Point Pelee Peterborough Municipal Airport Burlington Lift Bridge Point Petre Cobourg Oshawa Executive Airport South Lake Huron - 45149 Port Colborne Brockville 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 Windsor Airport Lake St Clair - 45147 South Georgian Bay - 45143 Port Colborne - 45142 Grimsby - 45139 Georgian Bay - 45137 Prince Edward Point - 45135 Port Stanley - 45132 Welland-Pelham Grenadier Island Kingston Airport Collingwood Lagoon City Muskoka Airport Parry Sound Harbour Lake Simcoe Regional Airport Wiarton Airport Western Islands Sarnia Chris Hadfield Airport Vineland Station Southeast Shoal St. Catharines / Niagara District Airport Goderich Port Weller Long Point Tobermory
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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

Watches (In effect)

Squall watch in effect

Lake St. Clair

Issued 5:15 PM EDT 16 August 2026 Scattered thunderstorms are expected to cross the lake late this afternoon into this evening. Some of these storms may produce wind gusts up to 35 knots.

Mariners are advised to prepare for potential squalls. Vulnerable vessels are most at risk and should seek safe harbour if underway.

Please continue to monitor alerts and forecasts issued by Environment Canada. For more information monitor Canadian Coast Guard radio or Weatheradio stations.

Synopsis

Technical Marine Synopsis

Issued 6:30 PM EDT 16 August 2026 Tonight and Monday At 6:30 p.m. EDT tonight trough located on a line north-south over
southwestern Ontario.
By 6:30 p.m. EDT Monday trough located on a line north-south over
southeastern Quebec.

At 6:30 p.m. EDT tonight ridge located on a line northeast-southwest
over northwestern Ontario.
By 6:30 p.m. EDT Monday ridge located from James Bay to Lake
Michigan then to Kansas.

At 6:30 p.m. EDT tonight cold front located on a line
northeast-southwest over northwestern Manitoba.
By 6:30 p.m. EDT Monday approaching cold front located on a line
northeast-southwest over northwestern Ontario.

Great Lakes - Lake Erie and Lake Ontario Area

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Marine Weather for Canada

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