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Northern Georgian Bay

Warnings

Forecast

Marine Forecast

Issued 06:30 PM EDT 18 August 2026

Tonight and Wednesday.

Wind southwest 15 knots increasing to northwest 15 to 20 near midnight then becoming northwest 15 early Wednesday morning.

Scattered showers ending near noon Wednesday with a risk of thunderstorms.

Waves

Issued 06:30 PM EDT 18 August 2026
Tonight and Wednesday. Waves 0.5 to 1 metre.

Extended Forecast

Issued 06:30 PM EDT 18 August 2026
Thursday Wind northwest 15 knots diminishing to light in the morning.
Friday Wind light becoming south 15 knots.
Saturday Wind south 15 knots becoming northwest 15 late in the day.

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Map of Great Lakes - Lake Erie and Lake Ontario marine weather areas Harrow AAFC Hamilton Munro Int'l Airport CFB Trenton Erieau Toronto City Centre Airport Point Pelee Peterborough Municipal Airport Burlington Lift Bridge Point Petre Cobourg Oshawa Executive Airport South Lake Huron - 45149 Port Colborne Brockville 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 Windsor Airport Lake St Clair - 45147 South Georgian Bay - 45143 Port Colborne - 45142 Grimsby - 45139 Georgian Bay - 45137 Prince Edward Point - 45135 Port Stanley - 45132 Welland-Pelham Grenadier Island Kingston Airport Collingwood Lagoon City Muskoka Airport Parry Sound Harbour Lake Simcoe Regional Airport Wiarton Airport Western Islands Sarnia Chris Hadfield Airport Vineland Station Southeast Shoal St. Catharines / Niagara District Airport Goderich Port Weller Long Point Tobermory
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land station Land Station
Ice Conditions

*Ice Forecast and Warnings also apply to U.S. waters

Ice Forecasts

Issued 12:00 PM EDT 17 May 2026 Forecasts have ended for the season.
Warnings

Warnings (In effect)

Squall warning in effect

Northern Georgian Bay

Issued 6:45 PM EDT 18 August 2026 Squalls with wind gusts up to 40 knots, frequent lightning and hail up to 2 centimetres are expected or occurring in the area.


Large hail can damage vessels and cause injury. Mariners are advised to prepare for squalls. If underway, seek safe harbour immediately. Take cover immediately, if threatening weather approaches. Consider delaying or postponing travel in areas under the squall warning.

Please continue to monitor alerts and forecasts issued by Environment Canada. For more information monitor Canadian Coast Guard radio or Weatheradio stations.

Synopsis

Technical Marine Synopsis

Issued 6:30 PM EDT 18 August 2026 Tonight and Wednesday At 6:30 p.m. EDT tonight ridge located on a line northeast-southwest
over Lake Erie.
By 6:30 p.m. EDT Wednesday ridge located on a line
northeast-southwest over West Virginia.

At 6:30 p.m. EDT tonight cold front located on a line
northeast-southwest over North Channel.
By 6:30 p.m. EDT Wednesday cold front located on a line
northeast-southwest over the St. Lawrence River.

At 6:30 p.m. EDT tonight weakening low 999 mb located south of
Hudson Bay.
By 6:30 p.m. EDT Wednesday weakening low 1004 mb located east of
James Bay.

Great Lakes - Lake Erie and Lake Ontario Area

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Marine Weather for Canada

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