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Southern Georgian Bay

Warnings

Forecast

Marine Forecast

Issued 10:30 AM EST 10 December 2025

Today Tonight and Thursday.

Wind northeast 15 knots backing to north 20 near noon then to northwest 25 early this evening. Wind diminishing to northwest 15 Thursday evening.

Snow changing to flurries this afternoon. Visibility 1 mile or less in precipitation.

Freezing spray warning in effect.

Freezing spray beginning near midnight and ending Thursday afternoon.

Waves

Issued 10:30 AM EST 10 December 2025
Today Tonight and Thursday. Waves 1.5 metres building to 2 this afternoon then subsiding to 1.5 Thursday afternoon.

Extended Forecast

Issued 03:00 AM EST 10 December 2025
Friday Wind northwest 15 knots increasing to southwest 25 late in the day.
Saturday Wind southwest 25 knots veering to northwest 20 late in the day.
Sunday Wind northwest 20 knots increasing 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
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

Warnings (In effect)

Freezing spray warning in effect

Southern Georgian Bay

Issued 10:30 AM EST 10 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 10:30 AM EST 10 December 2025 Today Tonight and Thursday At 10:30 a.m. EST today low 989 mb located over southeastern
Michigan.
By 10:30 a.m. EST Thursday low 984 mb located over southeastern
Quebec.

At 10:30 a.m. EST today ridge located on a line north-south over
Saskatchewan.
By 10:30 a.m. EST Thursday 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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