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Western Lake Superior

Warnings

Forecast

Marine Forecast

Issued 03:00 AM EDT 21 October 2026

Today Tonight and Thursday.

Wind southwest 15 to 20 knots diminishing to northwest 10 near noon then becoming light early this evening. Wind becoming southeast 10 overnight. Wind southeast 10 Thursday.

Scattered showers late this morning. Fog patches forming overnight and dissipating Thursday morning.

Waves

Issued 03:00 AM EDT 21 October 2026
Today Tonight and Thursday. Waves 0.5 to 1 metre subsiding to 0.5 or less this afternoon.

Extended Forecast

Issued 03:00 AM EDT 21 October 2026
Friday Wind south 20 knots.
Saturday Wind south 20 knots increasing to south 25.
Sunday Wind west 15 knots increasing to west 20.

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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
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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 21 October 2026 Today Tonight and Thursday At 3:00 a.m. EDT today departing high 1032 mb located over the
St. Lawrence River.

At 3:00 a.m. EDT today trough located over Lake Nipigon.
By 3:00 a.m. EDT Thursday trough located on a line
northeast-southwest over the St. Lawrence River.

At 3:00 a.m. EDT today high 1023 mb located over southern
Saskatchewan.
By 3:00 a.m. EDT Thursday high 1026 mb located over Thunder Bay.

Great Lakes - Lake Superior Area

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Marine Weather for Canada

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