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Western Lake Ontario

Warnings

Forecast

Marine Forecast

Issued 10:30 AM EDT 09 July 2025

Today Tonight and Thursday.

Wind light becoming southwest 10 knots near noon Thursday.

Scattered showers this afternoon and this evening with a risk of thunderstorms. Scattered showers Thursday afternoon and evening with a risk of thunderstorms.

Waves

Issued 10:30 AM EDT 09 July 2025
Today Tonight and Thursday. Waves less than 0.5 metres building to 0.5 Thursday afternoon.

Extended Forecast

Issued 03:00 AM EDT 09 July 2025
Friday Wind light.
Saturday Wind light becoming east 15 knots.
Sunday Wind south 15 knots diminishing to light.

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

Watches (In effect)

Squall watch in effect

Western Lake Ontario

Issued 5:47 PM EDT 09 July 2025 Conditions are favourable for the development of squalls with wind gusts up to 35 knots, frequent lightning and poor to very poor visibility in thunderstorms heavy at times.

Thunderstorms are expected this evening.

Proceed with caution as visibility may suddenly be reduced to near zero. 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 9 July 2025 Today Tonight and Thursday At 10:30 a.m. EDT today trough located on a line east-west over
southwestern Ontario.
By 10:30 a.m. EDT Thursday departing trough located on a line
east-west over central Ohio.

At 10:30 a.m. EDT today ridge located from James Bay to Minnesota.
By 10:30 a.m. EDT Thursday ridge located on a line
northeast-southwest over Upper Michigan.

By 10:30 a.m. EDT Thursday approaching trough located on a line
north-south over central South Dakota.

Great Lakes - Lake Huron Area

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Marine Weather for Canada

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