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Northern Georgian Bay

Warnings

Forecast

Marine Forecast

Issued 06:30 PM EST 09 December 2025

Tonight and Wednesday.

Wind west 20 knots diminishing to west 15 near midnight then increasing to northeast 20 early Wednesday morning. Wind backing to north 25 Wednesday afternoon then to northwest 25 Wednesday evening.

Snow changing to scattered flurries near midnight then to snow Wednesday morning. Scattered flurries Wednesday evening. Visibility 1 mile or less in snow.

Freezing spray warning in effect.

Freezing spray beginning Wednesday evening.

Waves

Issued 06:30 PM EST 09 December 2025
Tonight and Wednesday. Waves 1.5 metres subsiding to 0.5 to 1 late overnight then building to 1.5 Wednesday morning. Waves building to 2 Wednesday evening.

Extended Forecast

Issued 06:30 PM EST 09 December 2025
Thursday Wind northwest 25 knots.
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.

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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

Northern Georgian Bay

Issued 6:30 PM EST 09 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 6:30 PM EST 9 December 2025 Tonight and Wednesday At 6:30 p.m. EST tonight dissipating low 1000 mb located over
Lake Superior.

At 6:30 p.m. EST tonight low 991 mb located over Minnesota.
By 6:30 p.m. EST Wednesday low 990 mb located over eastern Ontario.

At 6:30 p.m. EST tonight departing ridge located on a line
northeast-southwest over Maine.

Great Lakes - Lake Erie and Lake Ontario Area

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Marine Weather for Canada

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