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Colour-coded Weather Alerts

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Western Lake Ontario

Warnings

Forecast

Marine Forecast

Issued 03:00 AM EST 09 December 2025

Today Tonight and Wednesday.

Wind southwest 10 knots increasing to south 15 this morning and to southwest 25 this afternoon. Wind veering to west 20 near midnight then backing to southwest 15 overnight. Wind backing to south 20 Wednesday morning then veering to southwest 25 near noon Wednesday. Wind veering to northwest 25 Wednesday evening.

Snow beginning near noon changing to scattered flurries this evening then to snow or rain Wednesday morning. Rain near noon Wednesday changing to scattered showers or scattered flurries Wednesday evening. Visibility 1 mile or less in snow.

Waves

Issued 03:00 AM EST 09 December 2025
Today Tonight and Wednesday. Waves 0.5 to 1 metre building to 1 to 1.5 near noon and to 2 early this evening. Waves subsiding to 1 overnight then building to 1.5 Wednesday morning and to 2 Wednesday afternoon.

Extended Forecast

Issued 03:00 AM EST 09 December 2025
Thursday Wind northwest 25 knots.
Friday Wind northwest 20 knots backing to southwest 15 late in the day.
Saturday Wind southwest 15 knots increasing to southwest 20.

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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

No watches or warnings in effect.

Synopsis

Technical Marine Synopsis

Issued 3:00 AM EST 9 December 2025 Today Tonight and Wednesday At 3:00 a.m. EST today departing ridge located on a line
northeast-southwest over eastern Ontario.

At 3:00 a.m. EST today low 1006 mb located west of Lake Superior.
By 3:00 a.m. EST Wednesday dissipating low 1001 mb located over
northeastern Ontario.

By 3:00 a.m. EST Wednesday approaching low 989 mb located over
Wisconsin.

Great Lakes - Lake Huron Area

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Marine Weather for Canada

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