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Southern Georgian Bay

Warnings

Forecast

Marine Forecast

Issued 03:00 AM EST 07 December 2025

Today Tonight and Monday.

Wind east 10 knots increasing to east 15 early this morning and to northwest 20 near noon. Wind increasing to northwest 25 this afternoon then diminishing to north 15 near midnight. Wind diminishing to variable 10 Monday morning then becoming southwest 10 near noon Monday. Wind increasing to southwest 15 Monday afternoon and to southwest 20 Monday evening.

Scattered flurries changing to snow early this morning then to scattered flurries this evening and ending near midnight. Visibility 1 mile or less in snow.

Risk of freezing spray tonight.

Waves

Issued 03:00 AM EST 07 December 2025
Today Tonight and Monday. Waves 1.5 to 2 metres.

Extended Forecast

Issued 03:00 AM EST 07 December 2025
Tuesday Wind southwest 20 knots increasing to south 30 in the morning then diminishing to west 20 in the afternoon.
Wednesday Wind light increasing to northeast 20 knots.
Thursday Wind northwest 15 knots increasing to northwest 20.

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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 3:00 AM EST 7 December 2025 Today Tonight and Monday At 3:00 a.m. EST today low 1014 mb located over Illinois.
By 3:00 a.m. EST Monday departing low 1012 mb located south of
Nova Scotia.

At 3:00 a.m. EST today ridge located on a line northwest-southeast
over Saskatchewan.
By 3:00 a.m. EST Monday ridge located on a line north-south over
northwestern Ontario.

Great Lakes - Lake Erie and Lake Ontario Area

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Marine Weather for Canada

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