Water Temperature of Duluth Harbor in Duluth, MN

Current Water Temperature

49.3°F

Measurement Time: Friday, November 28, 2025, 2:18 AM CST

Temperature Locations

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Local Points of Interest

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

Duluth Harbor

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

Elevation Above Sea Level: 597 feet

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 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

34.3°F
Fog
Fog
31°F
39.5°F
100%
ENE 3.8 mph
8 mph
35.7°F
36.6°F
0 in
100%
0 mi
1007 mbar
0

Five Day Weather Forecast

Fog
Thu
H: 62°F
L: 36°F
Moderate rain
Fri
H: 44°F
L: 34°F
Partly Cloudy
Sat
H: 43°F
L: 24°F
Partly Cloudy
Sun
H: 42°F
L: 25°F
Partly Cloudy
Mon
H: 55°F
L: 25°F

Air Quality

PM2.5: 4.95 μg/m3
PM10: 5.55 μg/m3
Carbon Monoxide: 165.85 μg/m3
Nitrogen Dioxide: 3.15 μg/m3
Sulphur Dioxide: 1.15 μg/m3
Ozone: 80 μg/m3

Astronomical

Sunrise: 6:19 AM
Sun Transit: 1:08 PM
Sunset: 7:58 PM
Daylight: 13 hrs 39 mins
Moonrise: 5:39 AM
Moon Transit: 12:23 AM
Moonset: 7:26 PM
Moon Phase: New
Moon Illumination: 0.8%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
11:53 AM - 2:23 PM

Minor Periods

6:56 PM - 8:26 PM
5:09 AM - 6:39 AM

Action Rating: 5 out of 5

Dense Fog Advisory issued April 15 at 1:03PM CDT until April 16 at 10:00AM CDT by NWS Duluth MN

Effective: Wed April 15, 2026, 1:03 PM
Expires: Thu April 16, 2026, 5:00 AM

* WHAT...Visibility one quarter mile or less in dense fog. * WHERE...In Minnesota, Carlton and South St. Louis, Southern Cook and Southern Lake Counties. In Wisconsin, Ashland, Bayfield, Douglas, and Iron Counties. This includes the Tribal Lands of the Fond du Lac Band, the northwestern area of the Lac du Flambeau Band, the Grand Portage Reservation, the Bad River Reservation and the Red Cliff Band. Other locations including Madeline Island and the Apostle Islands National Lakeshore. * WHEN...From 10 PM this evening to 10 AM CDT Thursday. * IMPACTS...Low visibility could make driving conditions hazardous. * ADDITIONAL DETAILS...Fog will develop tonight around Lake Superior and will be dense overnight. Visibility will improve Thursday morning.

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


Special Weather Statement issued April 15 at 6:10PM CDT by NWS Duluth MN

Effective: Wed April 15, 2026, 6:10 PM
Expires: Thu April 16, 2026, 7:00 AM

Dry conditions and breezy winds will lead to near critical fire weather conditions Thursday. South winds of 10 to 20 mph with gusts of 20 to 30 mph are forecast. Minimum relative humidity values of 20 to 30 percent are also expected. Together, these conditions could lead to the rapid spread of fires. Check burning restrictions and fire danger before burning. For more information on burning restrictions for Minnesota, see www.dnr.state.mn.us/forestry/fire/firerating_restrictions.html.


Thursday, April 16, 2026

Weather Forecast

Fog
62.1°F
36°F
44.2°F
92%
0 in
0%
0%
9.8 mph
1.3


Air Quality

AQI: 1 - Good
PM2.5: 4.63 μg/m3
PM10: 5.41 μg/m3
Carbon Monoxide: 180.09 μg/m3
Nitrogen Dioxide: 3.93 μg/m3
Sulphur Dioxide: 1.19 μg/m3
Ozone: 81.96 μg/m3

Astronomical

Sunrise: 6:19 AM
Sun Transit: 1:08 PM
Sunset: 7:58 PM
Daylight: 13 hrs 39 mins
Moonrise: 5:39 AM
Moon Transit: 12:23 AM
Moonset: 7:26 PM
Moon Phase: New
Moon Illumination: 0.8%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
11:53 AM - 2:23 PM

Minor Periods

6:56 PM - 8:26 PM
5:09 AM - 6:39 AM

Action Rating: 5 out of 5

Friday, April 17, 2026

Weather Forecast

Moderate rain
43.5°F
34.3°F
38.4°F
90%
0.36 in
86%
0%
13.9 mph
0.6


Air Quality

AQI: 1 - Good
PM2.5: 5.27 μg/m3
PM10: 5.96 μg/m3
Carbon Monoxide: 177.13 μg/m3
Nitrogen Dioxide: 3.72 μg/m3
Sulphur Dioxide: 1.39 μg/m3
Ozone: 90.24 μg/m3

Astronomical

Sunrise: 6:17 AM
Sun Transit: 1:07 PM
Sunset: 8:00 PM
Daylight: 13 hrs 42 mins
Moonrise: 6:00 AM
Moon Transit: 1:15 PM
Moonset: 8:51 PM
Moon Phase: New
Moon Illumination: 4.1%

Best Times for Fishing or Hunting

Major Periods

12:02 AM - 2:32 AM
12:45 AM - 3:15 PM

Minor Periods

8:21 PM - 9:51 PM
5:30 AM - 7:00 AM

Action Rating: 4 out of 5

Saturday, April 18, 2026

Weather Forecast

Partly Cloudy
42.8°F
23.9°F
31.8°F
57%
0 in
0%
0%
17.4 mph
1


Air Quality

AQI: 1 - Good
PM2.5: 2 μg/m3
PM10: 2.13 μg/m3
Carbon Monoxide: 173.78 μg/m3
Nitrogen Dioxide: 2.5 μg/m3
Sulphur Dioxide: 1.31 μg/m3
Ozone: 82.32 μg/m3

Astronomical

Sunrise: 6:15 AM
Sun Transit: 1:07 PM
Sunset: 8:01 PM
Daylight: 13 hrs 46 mins
Moonrise: 6:25 AM
Moon Transit: 2:12 PM
Moonset: 10:18 PM
Moon Phase: New
Moon Illumination: 1.2%

Best Times for Fishing or Hunting

Major Periods

12:56 AM - 3:26 AM
1:42 PM - 4:12 PM

Minor Periods

9:48 PM - 11:18 PM
5:55 AM - 7:25 AM

Action Rating: 4 out of 5

Sunday, April 19, 2026

Weather Forecast

Partly Cloudy
41.8°F
25.2°F
32.9°F
51%
0 in
0%
0%
10.1 mph
1.2


Air Quality

AQI: 1 - Good
PM2.5: 2.86 μg/m3
PM10: 3.37 μg/m3
Carbon Monoxide: 158.21 μg/m3
Nitrogen Dioxide: 1.66 μg/m3
Sulphur Dioxide: 1.29 μg/m3
Ozone: 99.85 μg/m3

Astronomical

Sunrise: 6:14 AM
Sun Transit: 1:07 PM
Sunset: 8:02 PM
Daylight: 13 hrs 49 mins
Moonrise: 6:58 AM
Moon Transit: 3:13 PM
Moonset: 11:43 PM
Moon Phase: Waxing Crescent
Moon Illumination: 4.9%

Best Times for Fishing or Hunting

Major Periods

1:55 AM - 4:25 AM
2:43 PM - 5:13 PM

Minor Periods

12:00 AM - 12:00 AM
6:28 AM - 7:58 AM

Action Rating: 3 out of 5

Monday, April 20, 2026

Weather Forecast

Partly Cloudy
54.9°F
24.6°F
36.6°F
57%
0 in
0%
0%
14.3 mph
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: 6:12 AM
Sun Transit: 1:07 PM
Sunset: 8:04 PM
Daylight: 13 hrs 52 mins
Moonrise: 7:43 AM
Moon Transit: 4:17 PM
Moonset: 12:43 AM
Moon Phase: Waxing Crescent
Moon Illumination: 10.8%

Best Times for Fishing or Hunting

Major Periods

2:58 AM - 5:28 AM
3:47 PM - 6:17 PM

Minor Periods

7:13 AM - 8:43 AM
12:00 AM - 12:00 AM

Action Rating: 2 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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