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Northern Georgian Bay

Warnings

Forecast

Marine Forecast

Issued 06:30 PM EST 07 December 2025

Tonight and Monday.

Wind northwest 20 knots diminishing to north 10 near midnight then becoming variable 10 early Monday morning. Wind increasing to southwest 15 Monday evening.

Scattered flurries Monday afternoon and evening.

Waves

Issued 06:30 PM EST 07 December 2025
Tonight and Monday. Waves 1 to 1.5 metres subsiding to 0.5 or less late overnight then building to 0.5 to 1 Monday evening.

Extended Forecast

Issued 06:30 PM EST 07 December 2025
Tuesday Wind southwest 25 knots backing to south 30 in the morning then veering to west 25 in the afternoon.
Wednesday Wind light increasing to northeast 20 knots.
Thursday Wind northwest 15 knots diminishing to light late in the day.

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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 6:30 PM EST 7 December 2025 Tonight and Monday At 6:30 p.m. EST tonight departing low 1014 mb located over Vermont.

At 6:30 p.m. EST tonight ridge located on a line north-south
over Minnesota.
By 6:30 p.m. EST Monday ridge located on a line northeast-southwest
over New York State.

By 6:30 p.m. EST Monday deepening low 1008 mb located over North
Dakota.

Great Lakes - Lake Erie and Lake Ontario Area

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Marine Weather for Canada

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