Water Temperature of Duluth Harbor in Duluth, MN

Current Water Temperature

61.3°F

Measurement Time: Tuesday, September 23, 2025, 10:18 PM CDT

Temperature Locations

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Local Points of Interest

Lake Superior; Park Point; Coast Guard Basin; Duluth Canal

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Duluth Harbor

Station Name: 9099064 - Duluth, MN
Station Type: Fixed
Data Source: National Data Buoy Center

Elevation Above Sea Level: 597 feet / 182 meters

Nearest Address:
870 Minnesota Ave
Duluth, MN 55802
St. Louis County

GPS Coordinates: 46.776, -92.092

Nearby Water Temperatures

Lake Superior, Superior, WI (4.0 mi)
Lake Superior, Duluth, MN (8.6 mi)
Lake Superior, Duluth, MN (9.6 mi)
Lake Superior, Duluth, MN (12.7 mi)
St. Louis River, Scanlon, MN (16.3 mi)
Knife River, Knife River, MN (18.4 mi)
Bois Brule River, Maple, WI (23.7 mi)
Lake Superior, Two Harbors, MN (26.2 mi)
Saint Louis River, Hoyt Lakes, MN (48.8 mi)
St. Croix River, Danbury, WI (48.9 mi)
Namekagon River, Cable, WI (55.3 mi)
Baptism River, Illgen City, MN (57.2 mi)
Chequamegon Bay, Ashland, WI (58.8 mi)
Partrige River, Babbitt, MN (58.8 mi)
Dunka River, Babbitt, MN (62.5 mi)

Weather for Duluth, Minnesota

Current Weather

59.2°F
Overcast
Conditions: Overcast
Humidity: 100%
Feels Like: 59.2°F
Wind: ENE 4 mph
Wind Gusts: 7.1 mph
Pressure: 30.12 in
Precipitation: 0 in
Cloud Cover: 100%
Visibility: 6 mi
UV Index: 0

Five Day Weather Forecast

Sunny
Wed
H: 72°F
L: 55°F
Partly Cloudy
Thu
H: 81°F
L: 53°F
Sunny
Fri
H: 70°F
L: 53°F
Patchy rain nearby
Sat
H: 69°F
L: 53°F
Sunny
Sun
H: 72°F
L: 48°F

Air Quality

PM2.5: 10.73 μg/m3
PM10: 11.1 μg/m3
Carbon Monoxide: 331.15 μg/m3
Nitrogen Dioxide: 12.03 μg/m3
Sulphur Dioxide: 1.3 μg/m3
Ozone: 60 μg/m3

Astronomical

Sunrise: 6:58 AM
Sun Transit: 1:00 PM
Sunset: 7:01 PM
Daylight: 12 hrs 3 mins
Moonrise: 10:03 AM
Moon Transit: 3:00 PM
Moonset: 7:47 PM
Moon Phase: New
Moon Illumination: 3.6%

Best Times for Fishing or Hunting

Major Periods

1:51 AM - 4:21 AM
2:30 PM - 5:00 PM

Minor Periods

7:17 PM - 8:47 PM
9:33 AM - 11:03 AM

Action Rating: 4 out of 5

Dense Fog Advisory issued September 23 at 7:05PM CDT until September 24 at 11:00AM CDT by NWS Duluth MN

Effective: Tue September 23, 2025, 7:05 PM
Expires: Wed September 24, 2025, 11:00 AM

* WHAT...Visibility one quarter mile or less in dense fog. * WHERE...In Minnesota, Crow Wing, Aitkin, Pine, South Itasca, Carlton, and South and Central St. Louis Counties. In Wisconsin, Ashland, Bayfield, Burnett, Douglas, Sawyer, and Washburn Counties. This includes the Tribal Lands of the Fond du Lac Band, the Bad River Reservation, the Red Cliff Band, the St. Croix Band in Burnett County, the Lac Courte Oreilles Reservation, the Bois Forte Band, Lake Vermilion area and the Mille Lacs Band, Hinckley, Lena Lake, East Lake and, Big Sandy Lake areas. Other locations including Madeline Island and the Apostle Islands National Lakeshore. * WHEN...From 1 AM to 11 AM CDT Wednesday. * IMPACTS...Low visibility could make driving conditions hazardous.

If driving, slow down, use your low-beam headlights and fog lights, and leave plenty of distance ahead of you.


Dense Fog Advisory issued September 23 at 7:05PM CDT until September 24 at 11:00AM CDT by NWS Duluth MN

Effective: Tue September 23, 2025, 7:05 PM
Expires: Wed September 24, 2025, 11:00 AM

* WHAT...Visibility one quarter mile or less in dense fog. * WHERE...In Minnesota, Crow Wing, Aitkin, Pine, South Itasca, Carlton, and South and Central St. Louis Counties. In Wisconsin, Ashland, Bayfield, Burnett, Douglas, Sawyer, and Washburn Counties. This includes the Tribal Lands of the Fond du Lac Band, the Bad River Reservation, the Red Cliff Band, the St. Croix Band in Burnett County, the Lac Courte Oreilles Reservation, the Bois Forte Band, Lake Vermilion area and the Mille Lacs Band, Hinckley, Lena Lake, East Lake and, Big Sandy Lake areas. Other locations including Madeline Island and the Apostle Islands National Lakeshore. * WHEN...From 1 AM to 11 AM CDT Wednesday. * IMPACTS...Low visibility could make driving conditions hazardous.

If driving, slow down, use your low-beam headlights and fog lights, and leave plenty of distance ahead of you.


Dense Fog Advisory issued September 23 at 7:05PM CDT until September 24 at 11:00AM CDT by NWS Duluth MN

Effective: Tue September 23, 2025, 7:05 PM
Expires: Wed September 24, 2025, 11:00 AM

* WHAT...Visibility one quarter mile or less in dense fog. * WHERE...In Minnesota, Crow Wing, Aitkin, Pine, South Itasca, Carlton, and South and Central St. Louis Counties. In Wisconsin, Ashland, Bayfield, Burnett, Douglas, Sawyer, and Washburn Counties. This includes the Tribal Lands of the Fond du Lac Band, the Bad River Reservation, the Red Cliff Band, the St. Croix Band in Burnett County, the Lac Courte Oreilles Reservation, the Bois Forte Band, Lake Vermilion area and the Mille Lacs Band, Hinckley, Lena Lake, East Lake and, Big Sandy Lake areas. Other locations including Madeline Island and the Apostle Islands National Lakeshore. * WHEN...From 1 AM to 11 AM CDT Wednesday. * IMPACTS...Low visibility could make driving conditions hazardous.

If driving, slow down, use your low-beam headlights and fog lights, and leave plenty of distance ahead of you.


Dense Fog Advisory issued September 23 at 7:05PM CDT until September 24 at 11:00AM CDT by NWS Duluth MN

Effective: Tue September 23, 2025, 7:05 PM
Expires: Wed September 24, 2025, 11:00 AM

* WHAT...Visibility one quarter mile or less in dense fog. * WHERE...In Minnesota, Crow Wing, Aitkin, Pine, South Itasca, Carlton, and South and Central St. Louis Counties. In Wisconsin, Ashland, Bayfield, Burnett, Douglas, Sawyer, and Washburn Counties. This includes the Tribal Lands of the Fond du Lac Band, the Bad River Reservation, the Red Cliff Band, the St. Croix Band in Burnett County, the Lac Courte Oreilles Reservation, the Bois Forte Band, Lake Vermilion area and the Mille Lacs Band, Hinckley, Lena Lake, East Lake and, Big Sandy Lake areas. Other locations including Madeline Island and the Apostle Islands National Lakeshore. * WHEN...From 1 AM to 11 AM CDT Wednesday. * IMPACTS...Low visibility could make driving conditions hazardous.

If driving, slow down, use your low-beam headlights and fog lights, and leave plenty of distance ahead of you.


Dense Fog Advisory issued September 23 at 7:05PM CDT until September 24 at 11:00AM CDT by NWS Duluth MN

Effective: Tue September 23, 2025, 7:05 PM
Expires: Wed September 24, 2025, 11:00 AM

* WHAT...Visibility one quarter mile or less in dense fog. * WHERE...In Minnesota, Crow Wing, Aitkin, Pine, South Itasca, Carlton, and South and Central St. Louis Counties. In Wisconsin, Ashland, Bayfield, Burnett, Douglas, Sawyer, and Washburn Counties. This includes the Tribal Lands of the Fond du Lac Band, the Bad River Reservation, the Red Cliff Band, the St. Croix Band in Burnett County, the Lac Courte Oreilles Reservation, the Bois Forte Band, Lake Vermilion area and the Mille Lacs Band, Hinckley, Lena Lake, East Lake and, Big Sandy Lake areas. Other locations including Madeline Island and the Apostle Islands National Lakeshore. * WHEN...From 1 AM to 11 AM CDT Wednesday. * IMPACTS...Low visibility could make driving conditions hazardous.

If driving, slow down, use your low-beam headlights and fog lights, and leave plenty of distance ahead of you.
Wednesday, September 24, 2025

Weather Forecast

Conditions: Sunny
Average Temperature: 62.5°F
Average Humidity: 83%
Chance of Rain: 0%
Wind: 4.7 mph
UV Index: 1

Air Quality

AQI: 1 - Good
PM2.5: 10.94 μg/m3
PM10: 11.15 μg/m3
Carbon Monoxide: 351.06 μg/m3
Nitrogen Dioxide: 8.86 μg/m3
Sulphur Dioxide: 2.04 μg/m3
Ozone: 81.92 μg/m3

Astronomical

Sunrise: 6:58 AM
Sun Transit: 1:00 PM
Sunset: 7:01 PM
Daylight: 12 hrs 3 mins
Moonrise: 10:03 AM
Moon Transit: 3:00 PM
Moonset: 7:47 PM
Moon Phase: New
Moon Illumination: 3.6%

Best Times for Fishing or Hunting

Major Periods

1:51 AM - 4:21 AM
2:30 PM - 5:00 PM

Minor Periods

7:17 PM - 8:47 PM
9:33 AM - 11:03 AM

Action Rating: 4 out of 5

Thursday, September 25, 2025

Weather Forecast

Conditions: Partly Cloudy
Average Temperature: 65.5°F
Average Humidity: 80%
Chance of Rain: 0%
Wind: 11.2 mph
UV Index: 1.1

Air Quality

AQI: 1 - Good
PM2.5: 9.49 μg/m3
PM10: 9.8 μg/m3
Carbon Monoxide: 357.12 μg/m3
Nitrogen Dioxide: 8.61 μg/m3
Sulphur Dioxide: 2.73 μg/m3
Ozone: 76.48 μg/m3

Astronomical

Sunrise: 7:00 AM
Sun Transit: 1:00 PM
Sunset: 6:59 PM
Daylight: 12 hrs mins
Moonrise: 11:11 AM
Moon Transit: 3:44 PM
Moonset: 8:09 PM
Moon Phase: Waxing Crescent
Moon Illumination: 8.9%

Best Times for Fishing or Hunting

Major Periods

2:34 AM - 5:04 AM
3:14 PM - 5:44 PM

Minor Periods

7:39 PM - 9:09 PM
10:41 AM - 12:11 AM

Action Rating: 2 out of 5

Friday, September 26, 2025

Weather Forecast

Conditions: Sunny
Average Temperature: 59.5°F
Average Humidity: 75%
Chance of Rain: 0%
Wind: 12.3 mph
UV Index: 1.1

Air Quality

AQI: 1 - Good
PM2.5: 5.59 μg/m3
PM10: 5.91 μg/m3
Carbon Monoxide: 290.6 μg/m3
Nitrogen Dioxide: 3.63 μg/m3
Sulphur Dioxide: 1.57 μg/m3
Ozone: 78.16 μg/m3

Astronomical

Sunrise: 7:01 AM
Sun Transit: 1:00 PM
Sunset: 6:57 PM
Daylight: 11 hrs 56 mins
Moonrise: 12:20 AM
Moon Transit: 4:30 PM
Moonset: 8:36 PM
Moon Phase: Waxing Crescent
Moon Illumination: 16.4%

Best Times for Fishing or Hunting

Major Periods

3:19 AM - 5:49 AM
4:00 PM - 6:30 PM

Minor Periods

8:06 PM - 9:36 PM
11:50 AM - 1:20 PM

Action Rating: 3 out of 5

Saturday, September 27, 2025

Weather Forecast

Conditions: Patchy rain nearby
Average Temperature: 60.1°F
Average Humidity: 60%
Chance of Rain: 86%
Wind: 12.1 mph
UV Index: 1

Air Quality

AQI: 1 - Good
PM2.5: 6.5 μg/m3
PM10: 6.8 μg/m3
Carbon Monoxide: 283.48 μg/m3
Nitrogen Dioxide: 5.42 μg/m3
Sulphur Dioxide: 2.18 μg/m3
Ozone: 78.85 μg/m3

Astronomical

Sunrise: 7:02 AM
Sun Transit: 1:00 PM
Sunset: 6:55 PM
Daylight: 11 hrs 53 mins
Moonrise: 1:25 PM
Moon Transit: 5:20 PM
Moonset: 9:11 PM
Moon Phase: Waxing Crescent
Moon Illumination: 25.6%

Best Times for Fishing or Hunting

Major Periods

4:08 AM - 6:38 AM
4:50 PM - 7:20 PM

Minor Periods

8:41 PM - 10:11 PM
12:55 AM - 2:25 PM

Action Rating: 4 out of 5

Sunday, September 28, 2025

Weather Forecast

Conditions: Sunny
Average Temperature: 57°F
Average Humidity: 46%
Chance of Rain: 0%
Wind: 9.6 mph
UV Index: 0

Air Quality

AQI: 0 -
PM2.5: 0 μg/m3
PM10: 0 μg/m3
Carbon Monoxide: 0 μg/m3
Nitrogen Dioxide: 0 μg/m3
Sulphur Dioxide: 0 μg/m3
Ozone: 0 μg/m3

Astronomical

Sunrise: 7:04 AM
Sun Transit: 12:58 AM
Sunset: 6:53 PM
Daylight: 11 hrs 50 mins
Moonrise: 2:26 PM
Moon Transit: 6:12 PM
Moonset: 9:57 PM
Moon Phase: First Quarter
Moon Illumination: 36.0%

Best Times for Fishing or Hunting

Major Periods

4:58 AM - 7:28 AM
5:42 PM - 8:12 PM

Minor Periods

9:27 PM - 10:57 PM
1:56 PM - 3:26 PM

Action Rating: 3 out of 5

The times presented here are based upon the solunar theory, which is the idea that the movements of fish and other animals are affected by the location of the sun and moon. The major periods are believed to be the times of the greatest animal activity and occur when the moon is directly overhead or underfoot (lunar transits). The minor periods also see increased activity and occur when the moon is rising or setting. The strongest activity occurs during full or new moons, and the weakest during quarter or three quarter moons. This is indicated by the Action Rating.

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