Wave Height Forecasts for the Great Lakes and St. Lawrence River (On)

Choose a Province or Territory

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* NOTE: Corrected and/or amended bulletins are listed first *

 
FQCN23 CWTO 050700
Wave height forecasts for the Canadian portion of the Great Lakes
issued by Environment Canada at 3:00 a.m. EDT Saturday 5 September
2026 for today tonight and Sunday.
The next scheduled forecast will be issued at 10:30 a.m. EDT.

Wave heights are for offshore and are forecast from trough to crest.
Nearshore waves may vary considerably due to shoreline effects.

Western Lake Superior.
Waves 0.5 metres or less.

Eastern Lake Superior.
Waves 0.5 metres or less.

Whitefish Bay.
Waves 0.5 metres or less subsiding to less than 0.5 overnight then
building to 0.5 or less Sunday evening.

Northern Lake Huron.
Waves 0.5 metres or less building to 0.5 to 1 early this morning then
subsiding to 0.5 early this evening.

Southern Lake Huron.
Waves 0.5 metres building to 1 near noon then subsiding to 0.5 Sunday
morning. Waves building to 1 Sunday evening.

Georgian Bay.
Waves 0.5 metres or less.

Lake St. Clair.
Waves 0.5 metres or less.

Western Lake Erie.
Waves 0.5 metres or less building to 0.5 to 1 near noon then
subsiding to 0.5 early this evening. Waves building to 0.5 to 1
overnight then subsiding to 0.5 or less Sunday evening.

Eastern Lake Erie.
Waves 0.5 metres or less building to 0.5 to 1 this afternoon.

Western Lake Ontario.
Waves 0.5 metres or less building to 0.5 to 1 near noon Sunday then
subsiding to 0.5 or less Sunday evening.

Eastern Lake Ontario.
Waves 0.5 metres or less building to 0.5 to 1 overnight then
subsiding to 0.5 or less Sunday evening.

End
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