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Lake St. Clair

Warnings

Forecast

Marine Forecast

Issued 10:30 AM EDT 02 July 2025

Today Tonight and Thursday.

Wind light becoming west 10 knots this evening then veering to north 10 Thursday morning. Wind becoming light Thursday afternoon.

Scattered showers this afternoon and tonight with a risk of thunderstorms.

Waves

Issued 10:30 AM EDT 02 July 2025
Today Tonight and Thursday. Waves 0.5 metres or less.

Extended Forecast

Issued 03:00 AM EDT 02 July 2025
Friday Wind light.
Saturday Wind light.
Sunday Wind light.

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Map of Great Lakes - Lake Huron marine weather areas Cove Island Goderich Oshawa Executive Airport CFB Trenton Western Islands Wiarton Airport Point Petre Lake Simcoe Regional Airport Parry Sound Harbour Toronto City Centre Airport Muskoka Airport Lagoon City Brockville Hamilton Munro Int'l Airport Sarnia Chris Hadfield Airport Tobermory Cobourg Harrow AAFC Long Point Port Weller Burlington Lift Bridge St. Catharines / Niagara District Airport Southeast Shoal Point Pelee Vineland Station Welland-Pelham Erieau Windsor Airport Port Colborne Killarney South Georgian Bay - 45143 Grimsby - 45139 Georgian Bay - 45137 Prince Edward Point - 45135 Port Stanley - 45132 Lake St Clair - 45147 South Lake Huron - 45149 Sault Ste. Marie Airport Lake Simcoe - 45151 Collingwood Greater Sudbury Airport North Bay Airport Kingston Airport Peterborough Municipal Airport Grenadier Island Port Colborne - 45142 Great Duck Island Ajax - 45159 Gore Bay-Manitoulin Airport North Channel - 45154 Lake Nipissing - 45152
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Ice Conditions

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

Ice Forecasts

Issued 12:00 PM EDT 16 May 2025 Forecasts have ended for the season.
Warnings

Watches (In effect)

Squall watch in effect

Lake St. Clair

Issued 1:23 PM EDT 02 July 2025 Conditions are favourable for the development of squalls with wind gusts up to 45 knots, frequent lightning and hail.

Thunderstorms are expected to develop this afternoon and track east over the area this afternoon and evening.

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 10:30 AM EDT 2 July 2025 Today Tonight and Thursday At 10:30 a.m. EDT today ridge located on a line north-south over
Manitoba.
By 10:30 a.m. EDT Thursday ridge located on a line north-south
over Lake Superior.

At 10:30 a.m. EDT today cold front located on a line
northeast-southwest over northern Ontario.
By 10:30 a.m. EDT Thursday cold front located on a line east-west
over southwestern Ontario.

Great Lakes - Lake Huron Area

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Marine Weather for Canada

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