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Northern Georgian Bay

Warnings

Forecast

Marine Forecast

Issued 10:30 AM EDT 18 May 2026

Today Tonight and Tuesday.

Strong wind warning in effect.

Wind south 10 knots increasing to southwest 15 this evening and to southwest 25 near noon Tuesday. Wind diminishing to west 15 Tuesday evening.

Scattered showers tonight and Tuesday with a risk of thunderstorms.

Waves

Issued 03:00 AM EDT 18 May 2026
Today Tonight and Tuesday. Waves 0.5 metres or less building to 0.5 to 1 early this morning then subsiding to 0.5 or less near noon. Waves building to 0.5 to 1 near midnight and to 1 to 1.5 Tuesday afternoon.

Extended Forecast

Issued 03:00 AM EDT 18 May 2026
Wednesday Wind northwest 20 knots.
Thursday Wind north 15 knots diminishing to light.
Friday Wind light becoming east 15 knots.

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Map of Great Lakes - Lake Huron marine weather areas Wiarton Airport Western Islands Cove Island Goderich Lake Simcoe Regional Airport Vineland Station Parry Sound Harbour Sarnia Chris Hadfield Airport Tobermory Muskoka Airport Harrow AAFC Long Point Port Weller St. Catharines / Niagara District Airport Lagoon City Southeast Shoal Burlington Lift Bridge Welland-Pelham Windsor Airport Port Colborne Erieau Peterborough Municipal Airport CFB Trenton Toronto City Centre Airport Point Petre Oshawa Executive Airport Hamilton Munro Int'l Airport Point Pelee Cobourg Port Colborne - 45142 North Channel - 45154 Ajax - 45159 Lake Nipissing - 45152 Sault Ste. Marie Airport Killarney Lake Simcoe - 45151 Greater Sudbury Airport South Lake Huron - 45149 Lake St Clair - 45147 North Bay Airport South Georgian Bay - 45143 Gore Bay-Manitoulin Airport Grimsby - 45139 Georgian Bay - 45137 Great Duck Island Collingwood Kingston Airport Grenadier Island Brockville Prince Edward Point - 45135 Port Stanley - 45132
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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)

Strong wind warning in effect

Georgian Bay

Issued 10:30 AM EDT 18 May 2026

'Strong' winds of 20 to 33 knots are 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.

Watches (In effect)

Squall watch in effect

Northern Georgian Bay

Issued 3:14 PM EDT 18 May 2026 Conditions are favourable for the development of squalls with wind gusts up to 45 knots and hail.

Thunderstorms are expected to move eastward across the area this afternoon into this evening.

Mariners are advised to prepare for potential squalls. Vulnerable vessels are most at risk and should seek safe harbour if underway.

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 10:30 AM EDT 18 May 2026 Today Tonight and Tuesday At 10:30 a.m. EDT today low 1004 mb located over western Wisconsin.
By 10:30 a.m. EDT Tuesday departing low 1004 mb located over
northeastern Ontario.

At 10:30 a.m. EDT today low 1001 mb located over Colorado.
By 10:30 a.m. EDT Tuesday cold front located on a line north-south
over Wisconsin.

Great Lakes - Lake Huron Area

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Marine Weather for Canada

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