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Western Lake Ontario

Warnings

Forecast

Marine Forecast

Issued 03:00 AM EST 14 December 2025

Today Tonight and Monday.

Wind west 20 knots veering to northwest 15 early this morning then increasing to northwest 20 this afternoon. Wind diminishing to northwest 15 this evening then backing to southwest 20 overnight. Wind increasing to southwest 30 near noon Monday then diminishing to west 20 Monday evening.

Scattered flurries today. Periods of snow Monday. Visibility 1 mile or less in snow.

Freezing spray warning in effect.

Freezing spray beginning Monday morning and ending Monday evening.

Waves

Issued 03:00 AM EST 14 December 2025
Today Tonight and Monday. Waves 1 metre subsiding to 0.5 near midnight then building to 1.5 Monday morning. Waves building to 2 to 3 near noon Monday.

Extended Forecast

Issued 03:00 AM EST 14 December 2025
Tuesday Wind southwest 20 knots increasing to southwest 25 late in the day.
Wednesday Wind southwest 25 knots diminishing to west 15 late in the day.
Thursday Wind south 15 knots increasing to south 25 late in the day.

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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

Warnings (In effect)

Freezing spray warning in effect

Western Lake Ontario

Issued 03:00 AM EST 14 December 2025

Moderate or severe freezing spray is occurring or expected to occur in this marine area. Please refer to the latest marine forecasts for further details and continue to monitor the situation through Canadian Coast Guard radio or Weatheradio stations.

Synopsis

Technical Marine Synopsis

Issued 3:00 AM EST 14 December 2025 Today Tonight and Monday At 3:00 a.m. EST today high 1044 mb located over southeastern
South Dakota.
By 3:00 a.m. EST Monday high 1039 mb located over Kentucky.

By 3:00 a.m. EST Monday approaching trough located on a line
north-south over Lake Superior.

Great Lakes - Lake Huron Area

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Marine Weather for Canada

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