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Marine Weather Forecast from Environment Canada

Winds


Issued 10:30 AM EDT 30 September 2026

Today Tonight and Thursday. Strong wind warning in effect. Wind southwest 15 knots diminishing to south 10 this afternoon then veering to southwest 10 late overnight. Wind increasing to northwest 20 Thursday morning.

Extended Forecast


Issued 03:00 AM EDT 30 September 2026
Friday Wind northwest 20 knots.
Saturday Wind light becoming southwest 15 knots late in the day.
Sunday Wind southwest 15 knots increasing to northwest 25.

Waves


Issued 10:30 AM EDT 30 September 2026

Today Tonight and Thursday. Waves 1 to 1.5 metres subsiding to 0.5 to 1 near noon and to 0.5 early this evening. Waves building to 1 to 1.5 near noon Thursday.

Weather & Visibility


Issued 10:30 AM EDT 30 September 2026

Today Tonight and Thursday.Periods of drizzle ending Thursday morning. Fog patches dissipating near noon Thursday.

 

Lake Superior Mafor Forecast and Weather Conditions
From NOAA National Weather Service Weather Forecast Office



  
070   
FZUS63 KMQT 301401  
GLFLS   
  
OPEN LAKE FORECAST FOR LAKE SUPERIOR  
NATIONAL WEATHER SERVICE MARQUETTE MI  
1001 AM EDT WED SEP 30 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  
  
A 29.2 INCH LOW OVER NORTHERN MANITOBA THIS MORNING DEEPENS TO 29.0   
INCHES OVER HUDSON BAY THIS AFTERNOON, SENDING A 29.7 INCH TROUGH   
OVER LAKE SUPERIOR TODAY. 29.8 INCH TROUGHING LINGERS OVER THE LAKE   
THROUGH THURSDAY MORNING BETWEEN THE CANADIAN LOW AND ANOTHER 29.7   
LOW OVER THE SOUTH PLAINS. HIGH PRESSURE BUILDS TO 30.3 INCHES OVER   
THE NORTHERN PLAINS THURSDAY NIGHT INTO FRIDAY BEFORE SHIFTING EAST   
TO THE GREAT LAKES FRIDAY NIGHT AND SATURDAY. A WEAK 29.9 INCH   
TROUGH CROSSES LAKE SUPERIOR SATURDAY NIGHT AND SUNDAY, WITH 30.3   
INCH HIGH PRESSURE QUICKLY RETURNING SUNDAY NIGHT INTO MONDAY.   
  
LSZ162-302000-  
LAKE SUPERIOR WEST OF A LINE FROM SAXON HARBOR WI TO GRAND  
PORTAGE MN BEYOND 5NM-  
1001 AM EDT WED SEP 30 2026 /901 AM CDT WED SEP 30 2026/  
   
REST OF TODAY  
SOUTHWEST WINDS 10 TO 20 KNOTS DIMINISHING TO  
5 TO 15 KNOTS LATE. WAVES CALM TO 2 FEET.    
TONIGHT  
WEST WINDS 5 TO 15 KNOTS BECOMING NORTHWEST 10 TO  
20 KNOTS LATE. WAVES CALM TO 2 FEET.    
THURSDAY  
NORTHWEST WINDS 10 TO 20 KNOTS BECOMING WEST 15 TO  
25 KNOTS IN THE AFTERNOON. WAVES CALM TO 2 FEET.    
THURSDAY NIGHT  
NORTHWEST WINDS 10 TO 20 KNOTS. WAVES CALM TO  
2 FEET.    
FRIDAY  
NORTHWEST WINDS 10 TO 20 KNOTS BECOMING WEST 5 TO  
15 KNOTS BY MID AFTERNOON. WAVES BUILDING TO 1 TO 3 FEET, THEN  
SUBSIDING TO CALM TO 2 FEET.    
FRIDAY NIGHT  
WEST WINDS 5 TO 15 KNOTS BECOMING SOUTHWEST LESS  
THAN 10 KNOTS AFTER MIDNIGHT. WAVES CALM TO 2 FEET.    
SATURDAY  
SOUTHWEST WINDS 5 TO 15 KNOTS BECOMING WEST 10 TO  
20 KNOTS. A CHANCE OF SHOWERS. WAVES BUILDING TO 1 TO 3 FEET.    
SUNDAY  
NORTHWEST WINDS 15 TO 25 KNOTS DIMINISHING TO 5 TO  
15 KNOTS. WAVES SUBSIDING TO CALM TO 2 FEET.   
  
  
  
LSZ263-302000-  
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-  
1001 AM EDT WED SEP 30 2026  
   
REST OF TODAY  
SOUTHWEST WINDS 10 TO 20 KNOTS INCREASING TO  
15 TO 25 KNOTS IN THE AFTERNOON, THEN BECOMING WEST 10 TO  
20 KNOTS LATE. WAVES 1 TO 3 FEET.    
TONIGHT  
SOUTHWEST WINDS 5 TO 15 KNOTS VEERING NORTHWEST LATE.  
WAVES SUBSIDING TO CALM TO 2 FEET.    
THURSDAY  
NORTHWEST WINDS 5 TO 15 KNOTS BECOMING WEST 10 TO  
20 KNOTS IN THE AFTERNOON, THEN INCREASING TO 15 TO 25 KNOTS  
LATE. WAVES BUILDING TO 2 TO 4 FEET.    
THURSDAY NIGHT  
NORTHWEST WINDS 10 TO 20 KNOTS INCREASING TO  
15 TO 25 KNOTS AFTER MIDNIGHT. WAVES SUBSIDING TO 1 TO 3 FEET,  
THEN BUILDING TO 2 TO 4 FEET.    
FRIDAY  
NORTHWEST WINDS 15 TO 25 KNOTS BECOMING WEST 10 TO  
20 KNOTS BY MID AFTERNOON. WAVES BUILDING TO 3 TO 5 FEET  
OCCASIONALLY TO 7 FEET, THEN SUBSIDING TO 1 TO 3 FEET.    
FRIDAY NIGHT  
WEST WINDS 5 TO 15 KNOTS BACKING SOUTHWEST AFTER  
MIDNIGHT. WAVES SUBSIDING TO CALM TO 2 FEET.    
SATURDAY  
SOUTHWEST WINDS 10 TO 20 KNOTS BECOMING WEST 15 TO  
25 KNOTS. A CHANCE OF SHOWERS. WAVES BUILDING TO 3 TO 5 FEET  
OCCASIONALLY TO 7 FEET.    
SUNDAY  
NORTHWEST WINDS 20 TO 30 KNOTS DIMINISHING TO 10 TO  
20 KNOTS. WAVES BUILDING TO 3 TO 6 FEET OCCASIONALLY TO 8 FEET,  
THEN SUBSIDING TO CALM TO 2 FEET.   
  
  
  
LSZ264-302000-  
LAKE SUPERIOR FROM UPPER ENTRANCE TO PORTAGE CANAL TO MANITOU  
ISLAND MI 5NM OFF SHORE TO THE US/CANADIAN BORDER-  
1001 AM EDT WED SEP 30 2026  
   
REST OF TODAY  
SOUTHWEST WINDS 10 TO 20 KNOTS DIMINISHING TO  
5 TO 15 KNOTS LATE. WAVES 1 TO 3 FEET.    
TONIGHT  
SOUTHWEST WINDS 5 TO 15 KNOTS VEERING NORTHWEST LATE.  
WAVES SUBSIDING TO CALM TO 2 FEET.    
THURSDAY  
NORTHWEST WINDS 10 TO 20 KNOTS BECOMING WEST 15 TO  
25 KNOTS IN THE AFTERNOON. WAVES BUILDING TO 2 TO 4 FEET.    
THURSDAY NIGHT  
NORTHWEST WINDS 10 TO 20 KNOTS INCREASING TO  
15 TO 25 KNOTS AFTER MIDNIGHT. WAVES 2 TO 4 FEET.    
FRIDAY  
NORTHWEST WINDS 15 TO 25 KNOTS BACKING WEST BY MID  
AFTERNOON. WAVES BUILDING TO 3 TO 6 FEET OCCASIONALLY TO 8 FEET,  
THEN SUBSIDING TO 1 TO 3 FEET.    
FRIDAY NIGHT  
WEST WINDS 5 TO 15 KNOTS. WAVES SUBSIDING TO CALM  
TO 2 FEET.    
SATURDAY  
SOUTHWEST WINDS 5 TO 15 KNOTS BECOMING WEST 15 TO  
25 KNOTS. A CHANCE OF SHOWERS. WAVES BUILDING TO 3 TO 5 FEET  
OCCASIONALLY TO 7 FEET.    
SUNDAY  
NORTHWEST GALES TO 35 KNOTS DIMINISHING TO 15 TO  
25 KNOTS. WAVES BUILDING TO 4 TO 7 FEET OCCASIONALLY TO 9 FEET,  
THEN SUBSIDING TO 1 TO 3 FEET.   
  
  
  
LSZ265-302000-  
LAKE SUPERIOR WEST OF LINE FROM MANITOU ISLAND TO MARQUETTE MI  
BEYOND 5NM FROM SHORE-  
1001 AM EDT WED SEP 30 2026  
   
REST OF TODAY  
SOUTHWEST WINDS 10 TO 20 KNOTS DIMINISHING TO  
5 TO 15 KNOTS IN THE AFTERNOON. WAVES CALM TO 2 FEET.    
TONIGHT  
SOUTHWEST WINDS 5 TO 15 KNOTS INCREASING TO 10 TO  
20 KNOTS AFTER MIDNIGHT, THEN VEERING WEST LATE. WAVES CALM TO  
2 FEET.    
THURSDAY  
NORTHWEST WINDS 20 TO 30 KNOTS BACKING WEST LATE.  
WAVES BUILDING TO 2 TO 4 FEET.    
THURSDAY NIGHT  
NORTHWEST WINDS 20 TO 30 KNOTS. WAVES SUBSIDING  
TO 1 TO 3 FEET, THEN BUILDING TO 3 TO 5 FEET OCCASIONALLY TO  
7 FEET.    
FRIDAY  
NORTHWEST GALES TO 35 KNOTS DIMINISHING TO 20 TO  
30 KNOTS BY MID AFTERNOON. WAVES BUILDING TO 4 TO 7 FEET  
OCCASIONALLY TO 9 FEET, THEN SUBSIDING TO 2 TO 4 FEET.    
FRIDAY NIGHT  
WEST WINDS 10 TO 20 KNOTS BACKING SOUTHWEST AFTER  
MIDNIGHT. WAVES SUBSIDING TO CALM TO 2 FEET.    
SATURDAY  
SOUTHWEST WINDS 10 TO 20 KNOTS INCREASING TO 20 TO  
30 KNOTS. A CHANCE OF SHOWERS. WAVES BUILDING TO 3 TO 5 FEET  
OCCASIONALLY TO 7 FEET.    
SUNDAY  
NORTHWEST GALES TO 45 KNOTS DIMINISHING TO 20 TO  
30 KNOTS. A CHANCE OF SHOWERS. WAVES BUILDING TO 7 TO 10 FEET  
OCCASIONALLY TO 13 FEET, THEN SUBSIDING TO 2 TO 4 FEET.   
  
  
  
LSZ266-302000-  
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-  
1001 AM EDT WED SEP 30 2026  
   
REST OF TODAY  
SOUTHWEST WINDS 10 TO 20 KNOTS DIMINISHING TO  
5 TO 15 KNOTS IN THE AFTERNOON, THEN BACKING SOUTH LATE. WAVES  
2 TO 4 FEET SUBSIDING TO 1 TO 3 FEET.    
TONIGHT  
SOUTH WINDS 5 TO 15 KNOTS BECOMING SOUTHWEST 10 TO  
20 KNOTS AFTER MIDNIGHT, THEN VEERING WEST LATE. WAVES SUBSIDING  
TO CALM TO 2 FEET.    
THURSDAY  
NORTHWEST WINDS 15 TO 25 KNOTS INCREASING TO 20 TO  
30 KNOTS IN THE AFTERNOON. WAVES BUILDING TO 3 TO 5 FEET  
OCCASIONALLY TO 7 FEET, THEN SUBSIDING TO 2 TO 4 FEET.    
THURSDAY NIGHT  
NORTHWEST WINDS 15 TO 25 KNOTS. WAVES BUILDING  
TO 3 TO 5 FEET OCCASIONALLY TO 7 FEET.    
FRIDAY  
NORTHWEST WINDS 20 TO 30 KNOTS. WAVES BUILDING TO 4 TO  
8 FEET OCCASIONALLY TO 10 FEET.    
FRIDAY NIGHT  
NORTHWEST WINDS 10 TO 20 KNOTS BECOMING WEST 5 TO  
15 KNOTS AFTER MIDNIGHT. WAVES SUBSIDING TO CALM TO 2 FEET.    
SATURDAY  
SOUTHWEST WINDS 10 TO 20 KNOTS INCREASING TO 20 TO  
30 KNOTS. SHOWERS LIKELY. WAVES BUILDING TO 3 TO 6 FEET  
OCCASIONALLY TO 8 FEET.    
SUNDAY  
NORTHWEST GALES TO 45 KNOTS. A CHANCE OF SHOWERS. WAVES  
BUILDING TO 7 TO 10 FEET OCCASIONALLY TO 13 FEET, THEN SUBSIDING  
TO 3 TO 5 FEET OCCASIONALLY TO 7 FEET.   
  
  
  
LSZ267-302000-  
LAKE SUPERIOR FROM GRAND MARAIS MI TO WHITEFISH POINT MI 5NM OFF  
SHORE TO THE US/CANADIAN BORDER-  
1001 AM EDT WED SEP 30 2026  
   
REST OF TODAY  
SOUTHWEST WINDS 10 TO 20 KNOTS BACKING SOUTH  
LATE. A SLIGHT CHANCE OF SHOWERS BY MID AFTERNOON. WAVES 2 TO  
4 FEET SUBSIDING TO CALM TO 2 FEET.    
TONIGHT  
SOUTH WINDS 10 TO 20 KNOTS VEERING SOUTHWEST AFTER  
MIDNIGHT. WAVES CALM TO 2 FEET.    
THURSDAY  
WEST WINDS 10 TO 20 KNOTS BECOMING NORTHWEST 15 TO  
25 KNOTS IN THE AFTERNOON, THEN INCREASING TO 20 TO 30 KNOTS  
LATE. WAVES BUILDING TO 3 TO 5 FEET OCCASIONALLY TO 7 FEET.    
THURSDAY NIGHT  
NORTHWEST WINDS 15 TO 25 KNOTS. WAVES SUBSIDING  
TO 2 TO 4 FEET, THEN BUILDING TO 3 TO 5 FEET OCCASIONALLY TO  
7 FEET.    
FRIDAY  
NORTHWEST WINDS 20 TO 30 KNOTS. WAVES BUILDING TO 7 TO  
10 FEET OCCASIONALLY TO 13 FEET, THEN SUBSIDING TO 5 TO 8 FEET  
OCCASIONALLY TO 10 FEET.    
FRIDAY NIGHT  
NORTHWEST WINDS 10 TO 20 KNOTS BECOMING WEST 5 TO  
15 KNOTS AFTER MIDNIGHT. WAVES SUBSIDING TO CALM TO 2 FEET.    
SATURDAY  
SOUTHWEST WINDS 5 TO 15 KNOTS INCREASING TO 15 TO  
25 KNOTS. SHOWERS LIKELY. WAVES BUILDING TO 3 TO 5 FEET  
OCCASIONALLY TO 7 FEET.    
SUNDAY  
NORTHWEST GALES TO 40 KNOTS DIMINISHING TO 20 TO  
30 KNOTS. A CHANCE OF SHOWERS. WAVES BUILDING TO 8 TO 11 FEET  
OCCASIONALLY TO 14 FEET, THEN SUBSIDING TO 3 TO 5 FEET  
OCCASIONALLY TO 7 FEET.   
  
  
  
LSZ261-302000-  
MAFOR 3015/  
SUPERIOR WEST 11520 12510 11610 11500 11610 12710. WAVES 1 TO 2  
FEET.   
  
SUPERIOR NORTH CENTRAL 11530 12520 12510 11610 12720. WAVES 1 TO  
3 FEET.   
  
SUPERIOR SOUTH CENTRAL 12510 12400 12510 11720 11730. WAVES 2  
FEET OR LESS THIS AFTERNOON AND TONIGHT. WAVES 1 TO 3 FEET  
THURSDAY MORNING.   
  
SUPERIOR EAST 11520 11510 13410 12510 11620. WAVES 2 TO 4 FEET  
THIS AFTERNOON. WAVES 1 TO 2 FEET TONIGHT AND THURSDAY MORNING.   
  
  
  
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  
 




Random Weather Facts

Weather Terms
Watch - A watch is used when the risk of a hazardous weather or hydrologic event has increased significantly, but its occurrence, location or timing is still uncertain. It is intended to provide enough lead time so those who need to set their plans in motion can do so. A watch means that hazardous weather is possible. People should have a plan of action in case a storm threatens and they should listen for later information and possible warnings especially when planning travel or outdoor activities.