FZUS63 KMQT 222001 GLFLS Open Lake Forecast for Lake Superior National Weather Service Marquette MI 401 PM EDT Sat Aug 22 2026 For waters beyond 5 nautical miles of shore on Lake Superior. Waves are the significant wave height - the average of the highest 1/3 of the wave spectrum. Occasional wave height is the average of the highest 1/10 of the wave spectrum. .SYNOPSIS... Pressure rises continue over Lake Superior behind an exiting 29.9 inch trough. This is followed by 30.1 inch ridging for the latter part of the weekend into early next week via a 30.2 inch parent high from the Canadian Prairies that drops down into the Ohio River Valley by late Monday, weakening to 30.1 inches as it does so. A 29.7 inch low over the Canadian Prairies Monday night then drops southeast towards Lake Superior, arriving early Wednesday morning. The low shifts east Wednesday night with weak ridging of 29.9 inches building over the lake on Thursday. LSZ162-230800- Lake Superior west of a line from Saxon Harbor WI to Grand Portage MN beyond 5NM- 401 PM EDT Sat Aug 22 2026 /301 PM CDT Sat Aug 22 2026/ .LATE THIS AFTERNOON...Northwest winds 10 to 20 knots. Waves calm to 2 feet. .TONIGHT...Northwest winds 10 to 20 knots veering north after midnight. Waves calm to 2 feet. .SUNDAY...North winds 5 to 15 knots backing southwest late. Waves calm to 2 feet. .SUNDAY NIGHT...Southwest winds 5 to 15 knots becoming northwest less than 10 knots after midnight. Waves calm to 2 feet. .MONDAY...North winds less than 10 knots becoming south 5 to 15 knots by mid afternoon. Waves calm to 2 feet. .MONDAY NIGHT...East winds 5 to 15 knots becoming south less than 10 knots after midnight. Waves calm to 2 feet. .TUESDAY...South winds 5 to 15 knots backing east by mid afternoon. A chance of showers. Waves calm to 2 feet. .TUESDAY NIGHT...Northeast winds 5 to 15 knots backing north after midnight. Showers likely through midnight. A chance of thunderstorms. A chance of showers after midnight. Waves calm to 2 feet. .WEDNESDAY...Northwest winds 5 to 15 knots increasing to 10 to 20 knots. Waves calm to 2 feet. .THURSDAY...Northwest winds 5 to 15 knots veering north. Waves calm to 2 feet. $$ LSZ263-230800- Lake Superior from Saxon Harbor WI to Upper Entrance to Portage Canal MI 5NM off shore to the US/Canadian border including Isle Royale National Park- 401 PM EDT Sat Aug 22 2026 .LATE THIS AFTERNOON...Northwest winds 5 to 15 knots. Waves calm to 2 feet. .TONIGHT...North winds 10 to 20 knots. Waves building to 2 to 4 feet. .SUNDAY...North winds 10 to 20 knots becoming west 5 to 15 knots late. Waves subsiding to calm to 2 feet. .SUNDAY NIGHT...West winds 5 to 15 knots veering northwest late. Waves calm to 2 feet. .MONDAY...North winds 5 to 15 knots backing southwest by mid afternoon. Waves calm to 2 feet. .MONDAY NIGHT...Southwest winds 5 to 15 knots backing south after midnight. Waves calm to 2 feet. .TUESDAY...South winds 5 to 15 knots backing east by mid afternoon. A chance of showers. Waves calm to 2 feet. .TUESDAY NIGHT...Southeast winds 5 to 15 knots veering south after midnight. Showers likely and a chance of thunderstorms. Waves calm to 2 feet. .WEDNESDAY...North winds 5 to 15 knots. A chance of showers. Waves calm to 2 feet. .THURSDAY...Northwest winds 5 to 15 knots veering north. Waves calm to 2 feet. $$ LSZ264-230800- Lake Superior from Upper Entrance to Portage Canal to Manitou Island MI 5NM off shore to the US/Canadian Border- 401 PM EDT Sat Aug 22 2026 .LATE THIS AFTERNOON...Northwest winds 10 to 20 knots. Waves 1 to 3 feet subsiding to calm to 2 feet. .TONIGHT...North winds 15 to 25 knots diminishing to 10 to 20 knots late. Waves building to 2 to 4 feet. .SUNDAY...North winds 10 to 20 knots backing northwest late. Waves subsiding tocalm to 2 feet. .SUNDAY NIGHT...Northwest winds 10 to 20 knots diminishing to 5 to 15 knots after midnight. Waves calm to 2 feet. .MONDAY...North winds 5 to 15 knots backing west by mid afternoon. Waves calm to 2 feet. .MONDAY NIGHT...West winds 5 to 15 knots becoming southwest less than 10 knots after midnight. Waves calm to 2 feet. .TUESDAY...South winds 5 to 15 knots backing southeast by mid afternoon. Waves calm to 2 feet. .TUESDAY NIGHT...Southeast winds 5 to 15 knots. A chance of showers through midnight. A chance of thunderstorms. Showers likely after midnight. Waves calm to 2 feet. .WEDNESDAY...East winds 5 to 15 knots backing north. Waves calm to 2 feet. .THURSDAY...Northwest winds 5 to 15 knots veering north. Waves calm to 2 feet. $$ LSZ265-230800- Lake Superior West of Line from Manitou Island to Marquette MI Beyond 5NM from shore- 401 PM EDT Sat Aug 22 2026 .LATE THIS AFTERNOON...Northwest winds 20 to 30 knots. Waves 3 to 5 feet occasionally to 7 feet. .TONIGHT...Northwest winds 20 to 30 knots veering north after midnight. A chance of showers after midnight. Waves subsiding to 2 to 4 feet, then building to 3 to 6 feet occasionally to 8 feet. .SUNDAY...North winds 20 to 30 knots backing northwest late. Waves building to 5 to 8 feet occasionally to 10 feet, then subsiding to 3 to 6 feet occasionally to 8 feet. .SUNDAY NIGHT...Northwest winds 15 to 25 knots. Waves subsiding to 1 to 3 feet. .MONDAY...Northwest winds 10 to 20 knots. Waves subsiding to calm to 2 feet. .MONDAY NIGHT...West winds 5 to 15 knots backing southwest after midnight. Waves calm to 2 feet. .TUESDAY...South winds 5 to 15 knots becoming southeast 10 to 20 knots by mid afternoon. Waves calm to 2 feet. .TUESDAY NIGHT...Southeast winds 15 to 25 knots becoming south 10 to 20 knots after midnight. Showers likely. Waves calm to 2 feet. .WEDNESDAY...Southwest winds 10 to 20 knots veering northwest. A chance of showers. Waves calm to 2 feet. .THURSDAY...North winds 15 to 25 knots becoming northwest 10 to 20 knots. Waves building to 1 to 3 feet, then subsiding to calm to 2 feet. $$ LSZ266-230800- Lake Superior East of a line from Manitou Island to Marquette MI and West of a line from Grand Marais MI to the US/Canadian Border Beyond 5NM from shore- 401 PM EDT Sat Aug 22 2026 .LATE THIS AFTERNOON...Northwest winds 20 to 30 knots. Waves 3 to 6 feet occasionally to 8 feet. .TONIGHT...Northwest winds 20 to 30 knots veering north after midnight. Waves 3 to 6 feet occasionally to 8 feet. .SUNDAY...North winds 20 to 30 knots backing northwest late. Waves building to 4 to 8 feet occasionally to 10 feet. .SUNDAY NIGHT...Northwest winds 20 to 30 knots diminishing to 15 to 25 knots after midnight. Waves subsiding to 2 to 4 feet. .MONDAY...Northwest winds 15 to 25 knots. Waves subsiding to calm to 2 feet. .MONDAY NIGHT...Northwest winds 5 to 15 knots backing west after midnight. Waves calm to 2 feet. .TUESDAY...South winds 5 to 15 knots backing southeast by mid afternoon. Waves calm to 2 feet. .TUESDAY NIGHT...Southeast winds 10 to 20 knots becoming south 15 to 25 knots after midnight. A chance of showers through midnight. Showers likely after midnight. Waves building to 1 to 3 feet. .WEDNESDAY...South winds 10 to 20 knots backing north. Showers likely. Waves subsiding to calm to 2 feet, then building to 1 to 3 feet. .THURSDAY...Northwest winds 15 to 25 knots becoming north 10 to 20 knots. Waves subsiding to calm to 2 feet. $$ LSZ267-230800- Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off shore to the US/Canadian border- 401 PM EDT Sat Aug 22 2026 .LATE THIS AFTERNOON...Northwest winds 20 to 30 knots. Isolated showers. Waves 3 to 5 feet occasionally to 7 feet. .TONIGHT...Northwest winds 20 to 30 knots veering north after midnight. Waves building to 3 to 6 feet occasionally to 8 feet. .SUNDAY...North winds 20 to 30 knots backing northwest in the afternoon, then increasing to 30 knots with a few gale force gusts to 35 knots possible late. Waves building to 5 to 8 feet occasionally to 10 feet. .SUNDAY NIGHT...Northwest winds 20 to 30 knots. Waves subsiding to 3 to 6 feet occasionally to 8 feet. .MONDAY...Northwest winds 20 to 30 knots diminishing to 15 to 25 knots by mid afternoon. Waves subsiding to 2 to 4 feet. .MONDAY NIGHT...Northwest winds 10 to 20 knots diminishing to 5 to 15 knots after midnight. Waves subsiding to calm to 2 feet. .TUESDAY...West winds 5 to 15 knots backing east by mid afternoon. Waves calm to 2 feet. .TUESDAY NIGHT...Southeast winds 5 to 15 knots increasing to 10 to 20 knots after midnight. A chance of showers. Waves building to 1 to 3 feet. .WEDNESDAY...Southeast winds 10 to 20 knots. Showers likely. A chance of showers. Waves subsiding to calm to 2 feet. .THURSDAY...Northwest winds 10 to 20 knots veering north. Waves calm to 2 feet. $$ LSZ261-230200- MAFOR 2221/ Superior West 12710 14820 11810 11500. Waves 2 feet or less. Superior North Central 11720 11730 14830 11830 11720. Waves 1 to 3 feet building to 2 to 4 feet tonight. Waves 2 to 4 feet Sunday. Superior South Central 12740 15840. Waves 3 to 5 feet tonight. Waves 4 to 7 feet Sunday. Superior East 12740 13830 12840 11740. Waves 3 to 5 feet tonight. Waves 3 to 6 feet building to 4 to 7 feet Sunday. $$ WFO MQT Experimental modernized open lake forecast is available online at weather.gov/mqt/glftable Graphical marine forecasts are available online at: weather.gov/greatlakes