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Eastern Lake Ontario

Warnings

Forecast

Marine Forecast

Issued 10:30 AM EST 21 January 2026

Today Tonight and Thursday.

Gale warning in effect.

Wind south 20 knots veering to west 25 late overnight then increasing to west 35 Thursday afternoon.

Flurries changing to snow near noon then to flurries near midnight. Visibility 1 mile or less in precipitation.

Risk of freezing spray late this morning.

Waves

Issued 10:30 AM EST 21 January 2026
Today Tonight and Thursday. Waves 1.5 metres subsiding to 1 near noon then building to 2 this evening. Waves building to 3 to 4 Thursday morning.

Extended Forecast

Issued 03:00 AM EST 21 January 2026
Friday Wind west 30 knots increasing to northwest 35 in the afternoon then diminishing to northwest 25 late in the day.
Saturday Wind northwest 20 knots.
Sunday Wind northeast 15 knots increasing to northeast 20.

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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

Warnings (In effect)

Gale warning in effect

Eastern Lake Ontario

Issued 10:30 AM EST 21 January 2026

'Gale' force winds of 34 to 47 knots are occurring or expected to occur in this marine area. Watch for updated statements. 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 10:30 AM EST 21 January 2026 Today Tonight and Thursday At 10:30 a.m. EST today departing ridge located on a line
northeast-southwest over the Eastern Seaboard.

At 10:30 a.m. EST today trough located on a line north-south over
the Ontario - Manitoba border.
By 10:30 a.m. EST Thursday low 1003 mb located over western Quebec.

Great Lakes - Lake Huron Area

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Marine Weather for Canada

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