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Western Lake Superior

Warnings

Forecast

Marine Forecast

Issued 03:00 AM EDT 18 August 2026

Today Tonight and Wednesday.

Wind west 10 knots increasing to west 15 near noon then diminishing to northwest 10 this evening. Wind backing to west 10 Wednesday evening.

Scattered showers ending early this morning with a risk of thunderstorms.

Waves

Issued 03:00 AM EDT 18 August 2026
Today Tonight and Wednesday. Waves 0.5 metres or less building to 0.5 to 1 this afternoon then subsiding to 0.5 or less near midnight.

Extended Forecast

Issued 03:00 AM EDT 18 August 2026
Thursday Wind light.
Friday Wind light becoming southeast 15 knots.
Saturday Wind light becoming northwest 15 knots late in the day.

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Map of Great Lakes - Lake Superior marine weather areas Royal Island Kenora Airport Sault Ste. Marie Airport Armstrong Airport Caribou Island Marathon Airport Pukaskwa National Park Wawa Airport Thunder Bay Airport Welcome Island Little Flatland Island Slate Island - 45136 Lake Of the Woods - 45148
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 17 May 2026 Forecasts have ended for the season.
Warnings

No watches or warnings in effect.

Synopsis

Technical Marine Synopsis

Issued 3:00 AM EDT 18 August 2026 Today Tonight and Wednesday At 3:00 a.m. EDT today ridge located on a line northeast-southwest
over southern Ontario.
By 3:00 a.m. EDT Wednesday ridge located on a line
northeast-southwest over Pennsylvania.

At 3:00 a.m. EDT today cold front located on a line north-south
over western Lake Superior.
By 3:00 a.m. EDT Wednesday departing trough located on a line
north-south over central Ontario.

Great Lakes - Lake Superior Area

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Marine Weather for Canada

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