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Lake St. Clair

Warnings

Forecast

Marine Forecast

Issued 10:30 AM EDT 20 July 2025

Today Tonight and Monday.

Wind north 10 knots becoming light near midnight then becoming northeast 10 Monday morning.

Scattered showers this morning.

Waves

Issued 10:30 AM EDT 20 July 2025
Today Tonight and Monday. Waves 0.5 metres or less.

Extended Forecast

Issued 03:00 AM EDT 20 July 2025
Tuesday Wind light.
Wednesday Wind light.
Thursday Wind light becoming southwest 15 knots.

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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
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 16 May 2025 Forecasts have ended for the season.
Warnings

No watches or warnings in effect.

Synopsis

Technical Marine Synopsis

Issued 10:30 AM EDT 20 July 2025 Today Tonight and Monday At 10:30 a.m. EDT today trough located on a line northeast-southwest
over the St. Lawrence River.
By 10:30 a.m. EDT Monday departing trough located on a line
north-south over Nova Scotia.

At 10:30 a.m. EDT today ridge from 1018 mb high located on a line
north-south over Lake of the Woods.
By 10:30 a.m. EDT Monday ridge from 1021 mb high located on a line
north-south over James Bay.

By 10:30 a.m. EDT Monday approaching trough located on a line
north-south over western Manitoba.

Great Lakes - Lake Erie and Lake Ontario Area

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Marine Weather for Canada

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