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Lake St. Clair

Warnings

Forecast

Marine Forecast

Issued 06:30 PM EDT 19 June 2025

Tonight and Friday.

Wind southwest 10 knots veering to west 10 Friday morning then becoming light Friday afternoon.

Scattered showers this evening with a risk of thunderstorms. Scattered showers Friday with a risk of thunderstorms.

Waves

Issued 06:30 PM EDT 19 June 2025
Tonight and Friday. Waves 0.5 metres or less.

Extended Forecast

Issued 06:30 PM EDT 19 June 2025
Saturday Wind light becoming south 15 knots in the morning.
Sunday Wind light.
Monday Wind light.

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Map of Great Lakes - Lake Erie and Lake Ontario marine weather areas Harrow AAFC Burlington Lift Bridge Oshawa Executive Airport Point Pelee Peterborough Municipal Airport Point Petre Hamilton Munro Int'l Airport Erieau Cobourg Toronto City Centre Airport Port Colborne CFB Trenton South Lake Huron - 45149 Windsor Airport Great Duck Island 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 Welland-Pelham Lake St Clair - 45147 South Georgian Bay - 45143 Port Colborne - 45142 Grimsby - 45139 Georgian Bay - 45137 Prince Edward Point - 45135 Port Stanley - 45132 Vineland Station Brockville Grenadier Island Kingston Airport Collingwood Lagoon City Muskoka Airport Parry Sound Harbour Lake Simcoe Regional Airport Wiarton Airport Cove Island Goderich Sarnia Chris Hadfield Airport Western Islands Tobermory Long Point Port Weller St. Catharines / Niagara District Airport Southeast Shoal
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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 16 May 2025 Forecasts have ended for the season.
Warnings

Watches (In effect)

Squall watch in effect

Lake St. Clair

Issued 7:01 PM EDT 19 June 2025 Thunderstorms this evening may produce 35 knot wind gusts.

Vessels without lightning protection should make their way to shore immediately. 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 19 June 2025 Tonight and Friday At 6:30 p.m. EDT tonight low 998 mb located west of Ottawa.
By 6:30 p.m. EDT Friday low 993 mb located over the Gulf of
St. Lawrence.

At 6:30 p.m. EDT tonight ridge located on a line northeast-southwest
over James Bay.
By 6:30 p.m. EDT Friday weakening ridge located on a line
north-south over James Bay.

By 6:30 p.m. EDT Friday approaching trough located on a line
northeast-southwest over Manitoba.

Great Lakes - Lake Erie and Lake Ontario Area

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Marine Weather for Canada

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