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Southern Georgian Bay

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Forecast

Marine Forecast

Issued 03:00 AM EST 17 December 2025

Today Tonight and Thursday.

Wind southwest 25 knots veering to west 30 this morning then diminishing to northwest 15 this afternoon. Wind diminishing to southwest 10 this evening then increasing to south 15 overnight. Wind increasing to south 20 Thursday morning and to south 25 Thursday evening.

Scattered showers today becoming scattered flurries or scattered showers and ending this evening. Rain Thursday afternoon and evening.

Waves

Issued 03:00 AM EST 17 December 2025
Today Tonight and Thursday. Waves 2 metres subsiding to 1 to 1.5 early this evening then building to 2 near noon Thursday.

Extended Forecast

Issued 03:00 AM EST 17 December 2025
Friday Wind southeast 25 knots veering to southwest 30 in the morning then to northwest 30 in the afternoon.
Saturday Wind northwest 20 knots becoming south 20.
Sunday Wind west 20 knots veering to northwest 25.

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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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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 3:00 AM EST 17 December 2025 Today Tonight and Thursday At 3:00 a.m. EST today departing trough from low located on a line
northeast-southwest over Sault Ste. Marie.

At 3:00 a.m. EST today ridge located on a line north-south over
Lake of the Woods.
By 3:00 a.m. EST Thursday ridge located on a line north-south
over Montréal.

By 3:00 a.m. EST Thursday low 982 mb located near Lake of the Woods.

Great Lakes - Lake Erie and Lake Ontario Area

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Marine Weather for Canada

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