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Colour-coded Weather Alerts

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Western Lake Ontario

Warnings

Forecast

Marine Forecast

Issued 03:00 AM EST 05 December 2025

Today Tonight and Saturday.

Wind south 15 knots veering to southwest 15 near noon then increasing to southwest 20 early this evening. Wind increasing to southwest 25 Saturday morning then veering to west 20 near noon Saturday.

Scattered flurries Saturday morning.

Waves

Issued 03:00 AM EST 05 December 2025
Today Tonight and Saturday. Waves 0.5 metres or less building to 0.5 to 1 early this morning and to 1.5 Saturday morning. Waves subsiding to 1 Saturday afternoon.

Extended Forecast

Issued 03:00 AM EST 05 December 2025
Sunday Wind light increasing to northwest 20 knots late in the day.
Monday Wind northwest 20 knots diminishing to light.
Tuesday Wind south 15 knots increasing to southwest 30.

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

No watches or warnings in effect.

Synopsis

Technical Marine Synopsis

Issued 3:00 AM EST 5 December 2025 Today Tonight and Saturday At 3:00 a.m. EST today ridge located on a line north-south over
Ottawa.
By 3:00 a.m. EST Saturday departing ridge located on a line
north-south over New Brunswick.

At 3:00 a.m. EST today cold front located on a line
northeast-southwest over southern Manitoba.
By 3:00 a.m. EST Saturday cold front located on a line
northeast-southwest over Sault Ste. Marie.

Great Lakes - Lake Erie and Lake Ontario Area

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Marine Weather for Canada

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