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Southern Lake Huron

Warnings

Forecast

Marine Forecast

Issued 10:30 AM EDT 21 July 2026

Today Tonight and Wednesday.

Strong wind warning in effect.

Wind west 15 knots increasing to northwest 30 early this evening then diminishing to northwest 20 Wednesday morning.

Scattered showers ending near noon Wednesday. Risk of thunderstorms today and early this evening.

Waves

Issued 10:30 AM EDT 21 July 2026
Today Tonight and Wednesday. Waves 1 to 1.5 metres subsiding to 0.5 to 1 near noon then building to 2 to 3 this evening. Waves subsiding to 1.5 near noon Wednesday.

Extended Forecast

Issued 03:00 AM EDT 21 July 2026
Thursday Wind northwest 15 knots diminishing to light in the morning.
Friday Wind southwest 15 knots diminishing to light late in the day.
Saturday Wind light becoming south 15 knots.

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

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

Ice Forecasts

Lake Huron

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

Ice Forecasts

Lake Michigan

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

Warnings (In effect)

Squall warning in effect

Southern Lake Huron

Issued 12:07 PM EDT 21 July 2026 Squalls with wind gusts up to 40 knots are expected or occurring in the area.

As of 12:06 p.m. EDT, a thunderstorm located 13 nautical miles northwest of Sarnia is moving eastward at 40 knots.

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

Strong wind warning in effect

Southern Lake Huron

Issued 10:30 AM EDT 21 July 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.

Synopsis

Technical Marine Synopsis

Issued 10:30 AM EDT 21 July 2026 Today Tonight and Wednesday At 10:30 a.m. EDT today trough from 991 mb low located on a line
north-south over North Channel.
By 10:30 a.m. EDT Wednesday trough from 993 mb low located on a
line north-south over New Hampshire.

At 10:30 a.m. EDT today ridge located on a line northwest-southeast
over Saskatchewan.
By 10:30 a.m. EDT Wednesday ridge located on a line
northwest-southeast over South Dakota.

Great Lakes - Lake Erie and Lake Ontario Area

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Marine Weather for Canada

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