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Marine Weather Forecast from Environment Canada

Winds


Issued 06:30 PM EDT 06 August 2026

Tonight and Friday. Strong wind warning in effect. Wind south 15 knots increasing to south 20 near midnight then diminishing to south 15 early Friday morning. Wind diminishing to variable 10 Friday afternoon.

Extended Forecast


Issued 06:30 PM EDT 06 August 2026
Saturday Wind light becoming southwest 15 knots in the afternoon.
Sunday Wind west 15 knots diminishing to light.
Monday Wind light.

Waves


Issued 06:30 PM EDT 06 August 2026

Tonight and Friday. Waves 1 metre subsiding to 0.5 or less Friday evening.

Weather & Visibility


Issued 06:30 PM EDT 06 August 2026

Tonight and Friday.Scattered showers Friday afternoon and evening with a risk of thunderstorms. Fog patches forming Friday evening.

 

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



  
482   
FZUS63 KMQT 070201  
GLFLS   
  
OPEN LAKE FORECAST FOR LAKE SUPERIOR  
NATIONAL WEATHER SERVICE MARQUETTE MI  
1001 PM EDT THU AUG 6 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  
  
LAKE SUPERIOR IS CURRENTLY SITUATED BETWEEN A 29.5 INCH LOW ALONG   
THE SHORE OF HUDSON BAY AT THE MANITOBA/ONTARIO LINE AND A 30.2 INCH   
BERMUDA HIGH. FRIDAY, A COLD FRONT BRINGS 29.8 INCH TROUGHING ACROSS   
THE LAKE BEFORE 29.9 INCH RIDGING RETURNS LATE FRIDAY NIGHT INTO   
SATURDAY. WHILE SOME WEAK 29.8 INCH TROUGHING COULD BE SEEN OVER   
LAKE SUPERIOR SATURDAY NIGHT, WEAK 29.9 INCH RIDGING SETTLES ONCE   
AGAIN OVER THE LAKE SUNDAY AND MONDAY, WITH A WEAK 29.8 INCH TROUGH   
POTENTIALLY PASSING THROUGH SUNDAY EVENING. THE HIGH PRESSURE   
RIDGING COULD INCREASE TO 30.0 INCHES BY TUESDAY.   
  
LSZ162-070800-  
LAKE SUPERIOR WEST OF A LINE FROM SAXON HARBOR WI TO GRAND  
PORTAGE MN BEYOND 5NM-  
1001 PM EDT THU AUG 6 2026 /901 PM CDT THU AUG 6 2026/  
   
REST OF TONIGHT  
SOUTH WINDS 10 TO 20 KNOTS VEERING SOUTHWEST  
LATE. WAVES 1 TO 3 FEET.    
FRIDAY  
SOUTHWEST WINDS 10 TO 20 KNOTS. A CHANCE OF SHOWERS AND  
THUNDERSTORMS. WAVES SUBSIDING TO CALM TO 2 FEET.    
FRIDAY NIGHT  
WEST WINDS 5 TO 15 KNOTS BECOMING NORTHWEST 10 TO  
20 KNOTS AFTER MIDNIGHT, THEN BACKING WEST LATE. WAVES CALM TO  
2 FEET.    
SATURDAY  
WEST WINDS 10 TO 20 KNOTS BACKING SOUTHWEST BY MID  
AFTERNOON. WAVES BUILDING TO 1 TO 3 FEET.    
SATURDAY NIGHT  
WEST WINDS 5 TO 15 KNOTS. A SLIGHT CHANCE OF  
SHOWERS. WAVES SUBSIDING TO CALM TO 2 FEET.    
SUNDAY  
WEST WINDS 5 TO 15 KNOTS BACKING SOUTH BY MID  
AFTERNOON. WAVES CALM TO 2 FEET.    
SUNDAY NIGHT  
NORTHEAST WINDS 5 TO 15 KNOTS BACKING NORTH AFTER  
MIDNIGHT. WAVES CALM TO 2 FEET.    
MONDAY  
NORTH WINDS 5 TO 15 KNOTS BACKING NORTHWEST. WAVES CALM  
TO 2 FEET.    
TUESDAY  
SOUTHWEST WINDS 5 TO 15 KNOTS VEERING WEST. WAVES CALM  
TO 2 FEET.   
  
  
  
LSZ263-070800-  
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 PM EDT THU AUG 6 2026  
   
REST OF TONIGHT  
SOUTH WINDS 10 TO 20 KNOTS INCREASING TO 15 TO  
25 KNOTS AFTER MIDNIGHT, THEN BECOMING SOUTHWEST 10 TO 20 KNOTS  
LATE. WAVES 1 TO 3 FEET BUILDING TO 2 TO 4 FEET.    
FRIDAY  
SOUTHWEST WINDS 10 TO 20 KNOTS DIMINISHING TO 5 TO  
15 KNOTS IN THE AFTERNOON. A CHANCE OF SHOWERS AND THUNDERSTORMS.  
WAVES SUBSIDING TO CALM TO 2 FEET.    
FRIDAY NIGHT  
WEST WINDS 5 TO 15 KNOTS VEERING NORTHWEST AFTER  
MIDNIGHT, THEN BACKING WEST LATE. WAVES CALM TO 2 FEET.    
SATURDAY  
WEST WINDS 5 TO 15 KNOTS BECOMING SOUTHWEST 10 TO  
20 KNOTS BY MID AFTERNOON. WAVES BUILDING TO 2 TO 4 FEET, THEN  
SUBSIDING TO 1 TO 3 FEET.    
SATURDAY NIGHT  
SOUTHWEST WINDS 10 TO 20 KNOTS BECOMING WEST  
5 TO 15 KNOTS AFTER MIDNIGHT. A SLIGHT CHANCE OF SHOWERS. WAVES  
SUBSIDING TO CALM TO 2 FEET.    
SUNDAY  
WEST WINDS 5 TO 15 KNOTS BACKING SOUTH BY MID  
AFTERNOON. WAVES CALM TO 2 FEET.    
SUNDAY NIGHT  
SOUTH WINDS 5 TO 15 KNOTS BECOMING WEST LESS THAN  
10 KNOTS AFTER MIDNIGHT. WAVES CALM TO 2 FEET.    
MONDAY  
WEST WINDS 5 TO 15 KNOTS. WAVES CALM TO 2 FEET.    
TUESDAY  
WEST WINDS 10 TO 20 KNOTS DIMINISHING TO 5 TO  
15 KNOTS. WAVES CALM TO 2 FEET.   
  
  
  
LSZ264-070800-  
LAKE SUPERIOR FROM UPPER ENTRANCE TO PORTAGE CANAL TO MANITOU  
ISLAND MI 5NM OFF SHORE TO THE US/CANADIAN BORDER-  
1001 PM EDT THU AUG 6 2026  
   
REST OF TONIGHT  
SOUTH WINDS 5 TO 15 KNOTS INCREASING TO 10 TO  
20 KNOTS AFTER MIDNIGHT. WAVES 1 TO 3 FEET BUILDING TO 2 TO  
4 FEET.    
FRIDAY  
SOUTHWEST WINDS 10 TO 20 KNOTS DIMINISHING TO 5 TO  
15 KNOTS IN THE AFTERNOON. A CHANCE OF SHOWERS AND THUNDERSTORMS.  
WAVES SUBSIDING TO CALM TO 2 FEET.    
FRIDAY NIGHT  
WEST WINDS 5 TO 15 KNOTS VEERING NORTHWEST AFTER  
MIDNIGHT. A SLIGHT CHANCE OF SHOWERS AND THUNDERSTORMS THROUGH  
MIDNIGHT. WAVES CALM TO 2 FEET.    
SATURDAY  
WEST WINDS 5 TO 15 KNOTS BECOMING SOUTHWEST 10 TO  
20 KNOTS BY MID AFTERNOON. WAVES BUILDING TO 1 TO 3 FEET.    
SATURDAY NIGHT  
SOUTHWEST WINDS 5 TO 15 KNOTS VEERING WEST  
AFTER MIDNIGHT. WAVES SUBSIDING TO CALM TO 2 FEET.    
SUNDAY  
WEST WINDS 5 TO 15 KNOTS BACKING SOUTHWEST BY MID  
AFTERNOON. WAVES CALM TO 2 FEET.    
SUNDAY NIGHT  
SOUTHWEST WINDS 5 TO 15 KNOTS DIMINISHING TO LESS  
THAN 10 KNOTS AFTER MIDNIGHT. WAVES CALM TO 2 FEET.    
MONDAY  
SOUTHWEST WINDS 5 TO 15 KNOTS VEERING WEST. WAVES CALM  
TO 2 FEET.    
TUESDAY  
WEST WINDS 5 TO 15 KNOTS. WAVES CALM TO 2 FEET.   
  
  
  
LSZ265-070800-  
LAKE SUPERIOR WEST OF LINE FROM MANITOU ISLAND TO MARQUETTE MI  
BEYOND 5NM FROM SHORE-  
1001 PM EDT THU AUG 6 2026  
   
REST OF TONIGHT  
SOUTH WINDS 15 TO 25 KNOTS DIMINISHING TO  
10 TO 20 KNOTS LATE. WAVES 2 TO 4 FEET SUBSIDING TO CALM TO  
2 FEET.    
FRIDAY  
SOUTH WINDS 10 TO 20 KNOTS BACKING SOUTHEAST IN THE  
AFTERNOON, THEN BACKING NORTH LATE. SHOWERS LIKELY AND A CHANCE  
OF THUNDERSTORMS BY MID AFTERNOON. WAVES CALM TO 2 FEET.    
FRIDAY NIGHT  
SOUTHWEST WINDS 10 TO 20 KNOTS VEERING WEST AFTER  
MIDNIGHT. A CHANCE OF THUNDERSTORMS AND A SLIGHT CHANCE OF  
SHOWERS THROUGH MIDNIGHT. WAVES CALM TO 2 FEET.    
SATURDAY  
WEST WINDS 15 TO 25 KNOTS DIMINISHING TO 10 TO  
20 KNOTS BY MID AFTERNOON. WAVES BUILDING TO 1 TO 3 FEET, THEN  
SUBSIDING TO CALM TO 2 FEET.    
SATURDAY NIGHT  
SOUTHWEST WINDS 10 TO 20 KNOTS. A SLIGHT CHANCE  
OF SHOWERS AFTER MIDNIGHT. WAVES CALM TO 2 FEET.    
SUNDAY  
WEST WINDS 10 TO 20 KNOTS BECOMING NORTHEAST 5 TO  
15 KNOTS BY MID AFTERNOON. WAVES CALM TO 2 FEET.    
SUNDAY NIGHT  
SOUTH WINDS 5 TO 15 KNOTS VEERING SOUTHWEST AFTER  
MIDNIGHT. WAVES CALM TO 2 FEET.    
MONDAY  
NORTHEAST WINDS 5 TO 15 KNOTS BACKING WEST. WAVES CALM  
TO 2 FEET.    
TUESDAY  
WEST WINDS 5 TO 15 KNOTS BACKING SOUTHWEST. WAVES CALM  
TO 2 FEET.   
  
  
  
LSZ266-070800-  
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 PM EDT THU AUG 6 2026  
   
REST OF TONIGHT  
SOUTH WINDS 15 TO 25 KNOTS. WAVES 2 TO 4 FEET  
BUILDING TO 3 TO 5 FEET OCCASIONALLY TO 7 FEET, THEN SUBSIDING TO  
2 TO 4 FEET.    
FRIDAY  
SOUTH WINDS 10 TO 20 KNOTS. A CHANCE OF SHOWERS AND  
THUNDERSTORMS BY MID AFTERNOON. WAVES SUBSIDING TO CALM TO  
2 FEET.    
FRIDAY NIGHT  
SOUTHWEST WINDS 10 TO 20 KNOTS BECOMING WEST 5 TO  
15 KNOTS AFTER MIDNIGHT, THEN BECOMING NORTHWEST 10 TO 20 KNOTS  
LATE. SHOWERS LIKELY AND A CHANCE OF THUNDERSTORMS THROUGH  
MIDNIGHT, THEN A SLIGHT CHANCE OF SHOWERS AFTER MIDNIGHT. WAVES  
CALM TO 2 FEET.    
SATURDAY  
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.    
SATURDAY NIGHT  
SOUTHWEST WINDS 5 TO 15 KNOTS INCREASING TO  
10 TO 20 KNOTS AFTER MIDNIGHT. A SLIGHT CHANCE OF SHOWERS AFTER  
MIDNIGHT. WAVES SUBSIDING TO CALM TO 2 FEET.    
SUNDAY  
WEST WINDS 10 TO 20 KNOTS DIMINISHING TO 5 TO 15 KNOTS  
BY MID AFTERNOON. WAVES CALM TO 2 FEET.    
SUNDAY NIGHT  
SOUTH WINDS 5 TO 15 KNOTS. WAVES CALM TO 2 FEET.    
MONDAY  
SOUTHWEST WINDS 5 TO 15 KNOTS VEERING NORTHWEST. WAVES  
CALM TO 2 FEET.    
TUESDAY  
WEST WINDS 5 TO 15 KNOTS. WAVES CALM TO 2 FEET.   
  
  
  
LSZ267-070800-  
LAKE SUPERIOR FROM GRAND MARAIS MI TO WHITEFISH POINT MI 5NM OFF  
SHORE TO THE US/CANADIAN BORDER-  
1001 PM EDT THU AUG 6 2026  
   
REST OF TONIGHT  
SOUTH WINDS 10 TO 20 KNOTS. WAVES CALM TO  
2 FEET BUILDING TO 1 TO 3 FEET.    
FRIDAY  
SOUTH WINDS 10 TO 20 KNOTS. WAVES SUBSIDING TO CALM TO  
2 FEET.    
FRIDAY NIGHT  
SOUTH WINDS 10 TO 20 KNOTS VEERING SOUTHWEST  
AFTER MIDNIGHT, THEN VEERING NORTHWEST LATE. SHOWERS THROUGH  
MIDNIGHT. A CHANCE OF THUNDERSTORMS. A CHANCE OF SHOWERS AFTER  
MIDNIGHT. WAVES CALM TO 2 FEET.    
SATURDAY  
WEST WINDS 10 TO 20 KNOTS. WAVES CALM TO 2 FEET.    
SATURDAY NIGHT  
SOUTHWEST WINDS 5 TO 15 KNOTS INCREASING TO  
10 TO 20 KNOTS AFTER MIDNIGHT. WAVES CALM TO 2 FEET.    
SUNDAY  
SOUTHWEST WINDS 10 TO 20 KNOTS BECOMING NORTHWEST 5 TO  
15 KNOTS BY MID AFTERNOON. WAVES CALM TO 2 FEET.    
SUNDAY NIGHT  
WEST WINDS 5 TO 15 KNOTS BACKING SOUTH AFTER  
MIDNIGHT. WAVES CALM TO 2 FEET.    
MONDAY  
SOUTH WINDS 5 TO 15 KNOTS VEERING NORTHWEST. WAVES CALM  
TO 2 FEET.    
TUESDAY  
WEST WINDS 5 TO 15 KNOTS. WAVES CALM TO 2 FEET.   
  
  
  
LSZ261-070800-  
MAFOR 0703/  
SUPERIOR WEST 12430 11520 12510 11616 11510 11610. A CHANCE OF  
THUNDERSTORMS FRIDAY AFTERNOON. WAVES 1 TO 3 FEET OVERNIGHT AND  
FRIDAY. WAVES 1 FOOT OR LESS FRIDAY EVENING.   
  
SUPERIOR NORTH CENTRAL 11420 11430 11420 11520 12510 11406 11500.  
A CHANCE OF THUNDERSTORMS FRIDAY AFTERNOON AND FRIDAY EVENING.  
WAVES 1 TO 3 FEET BUILDING TO 2 TO 4 FEET OVERNIGHT. WAVES 2 TO 4  
FEET SUBSIDING TO 1 TO 3 FEET FRIDAY. WAVES 1 TO 2 FEET FRIDAY  
EVENING.   
  
SUPERIOR SOUTH CENTRAL 11430 14420 11310 11616 11416. A CHANCE OF  
THUNDERSTORMS FRIDAY AFTERNOON AND FRIDAY EVENING. WAVES 2 TO 4  
FEET OVERNIGHT. WAVES 1 TO 3 FEET FRIDAY AND FRIDAY EVENING.   
  
SUPERIOR EAST 11430 14420 12410 11416. A CHANCE OF THUNDERSTORMS  
FRIDAY EVENING. WAVES 2 TO 4 FEET OVERNIGHT. WAVES 2 TO 4 FEET  
SUBSIDING TO 1 TO 3 FEET FRIDAY. WAVES 1 TO 2 FEET FRIDAY  
EVENING.   
  
  
  
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

Canadian Facts and Trivia - THE LAND
Saint John, N.B., on the shores of the Bay of Fundy and at the mouth of the St. John River, is home to a rare natural phenomenon that is a product of its unique location.

The city’s Reversing Falls combine the large flow of the river with the legendary high tides of the bay, such that, depending on the tide, the rapids flow first to the sea, then again inland, over the course of several hours.