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Northern Georgian Bay

Warnings

Forecast

Marine Forecast

Issued 06:30 PM EST 04 December 2025

Tonight and Friday.

Gale warning in effect.

Wind northwest 15 knots backing to southwest 15 this evening then increasing to southwest 25 near midnight. Wind increasing to southwest 35 early Friday morning then diminishing to southwest 25 near noon Friday.

Scattered flurries beginning near midnight changing to snow Friday morning. Visibility 1 mile or less in snow.

Risk of freezing spray overnight.

Waves

Issued 06:30 PM EST 04 December 2025
Tonight and Friday. Waves 0.5 to 1 metre building to 1.5 near midnight and to 2 to 3 late overnight. Waves subsiding to 1.5 Friday afternoon.

Extended Forecast

Issued 06:30 PM EST 04 December 2025
Saturday Wind southwest 25 knots veering to northwest 20 in the afternoon.
Sunday Wind light increasing to northwest 20 knots late in the day.
Monday Wind northwest 20 knots diminishing to light.

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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)

Gale warning in effect

Northern Georgian Bay

Issued 7:01 PM EST 04 December 2025

'Gale' force winds of 34 to 47 knots are occurring or expected to occur in this marine area. Watch for updated statements. 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 6:30 PM EST 4 December 2025 Tonight and Friday At 6:30 p.m. EST tonight ridge located on a line northeast-southwest
over southwestern Ontario.
By 6:30 p.m. EST Friday departing ridge located on a line
northeast-southwest over the Maritimes.

At 6:30 p.m. EST tonight cold front located on a line east-west
over southern Manitoba.
By 6:30 p.m. EST Friday cold front located on a line
northeast-southwest over Lake Superior.

Great Lakes - Lake Erie and Lake Ontario Area

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Marine Weather for Canada

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