Water Temperature of Lake Superior in Duluth, MN

Current Water Temperature

63.0°F

Measurement Time: Saturday, September 16, 2023, 12:00 AM CDT

Temperature Locations

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Local Points of Interest

Lakewood, MN

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Lake Superior

Station Name: Lakewood Water Plant
Data Source: USGS

Elevation Above Sea Level: 614 feet / 187 meters

Nearest Address:
8126 Congdon Blvd
Duluth, MN 55804
St. Louis County

GPS Coordinates: 46.8619, -91.9600

Nearby Water Temperatures

Lake Superior, Duluth, MN (1.4 mi)
Lake Superior, Duluth, MN (7.0 mi)
Duluth Harbor, Duluth, MN (8.6 mi)
Knife River, Knife River, MN (9.9 mi)
Lake Superior, Superior, WI (10.9 mi)
Lake Superior, Two Harbors, MN (17.6 mi)
Bois Brule River, Maple, WI (20.1 mi)
St. Louis River, Scanlon, MN (24.3 mi)
Saint Louis River, Hoyt Lakes, MN (42.9 mi)
Baptism River, Illgen City, MN (48.6 mi)
Partrige River, Babbitt, MN (52.4 mi)
Chequamegon Bay, Ashland, WI (54.1 mi)
Dunka River, Babbitt, MN (55.8 mi)
St. Croix River, Danbury, WI (56.0 mi)
Namekagon River, Cable, WI (56.3 mi)

Weather for Duluth, Minnesota

Current Weather

66.4°F
Mist
Conditions: Mist
Humidity: 60%
Feels Like: 66.4°F
Wind: WNW 2.2 mph
Wind Gusts: 6.7 mph
Pressure: 30.34 in
Precipitation: 0 in
Cloud Cover: 100%
Visibility: 4 mi
UV Index: 0

Five Day Weather Forecast

Sunny
Thu
H: 75°F
L: 54°F
Sunny
Fri
H: 82°F
L: 53°F
Partly Cloudy
Sat
H: 77°F
L: 56°F
Heavy rain
Sun
H: 63°F
L: 56°F
Moderate rain
Mon
H: 64°F
L: 61°F

Air Quality

AQI: 1 - Good
PM2.5: 60.68 μg/m3
PM10: 60.87 μg/m3
Carbon Monoxide: 678.95 μg/m3
Nitrogen Dioxide: 11.1 μg/m3
Sulphur Dioxide: 2.59 μg/m3
Ozone: 82 μg/m3

Astronomical

Sunrise: 5:47 AM
Sun Transit: 1:14 PM
Sunset: 8:41 PM
Daylight: 14 hrs 54 mins
Moonrise: 1:24 PM
Moon Transit: 6:26 PM
Moonset: 12:01 AM
Moon Phase: First Quarter
Moon Illumination: 36.7%

Best Times for Fishing or Hunting

Major Periods

5:19 AM - 7:49 AM
5:56 PM - 8:26 PM

Minor Periods

12:54 AM - 2:24 PM
12:00 AM - 12:00 AM

Action Rating: 4 out of 5

Air Quality Alert issued July 31 at 10:47AM CDT by NWS Duluth MN

Non-Weather Emergency Message. Not sent to IPAWS.

Effective: Thu July 31, 2025, 10:47 AM
Expires: Fri August 1, 2025, 12:15 PM

The Wisconsin Department of Natural Resources has issued an Air Quality Advisory for the following counties: Ashland, Bayfield, Burnett, Douglas, Iron, Price, Sawyer, Washburn. WHAT...The PM2.5 AQI is expected to reach the Unhealthy level. WHERE...All of Wisconsin WHEN...Until noon Friday, August 1 Precautionary/Preparedness Actions: Sensitive groups: Consider rescheduling or moving all activities inside. Go inside if you have symptoms. People with asthma: Follow your asthma action plan and keep quick-relief medicine handy. People with heart disease: Symptoms such as palpitations, shortness of breath, or unusual fatigue may indicate a serious problem. If you have any of these, contact your health care provider. Everyone else: Keep outdoor activities shorter and less intense. Go inside if you have symptoms. Additional Details: Canadian wildfire smoke will continue to impact Wisconsin`s surface air quality over the next several days. Widespread Unhealthy (Red) AQI for PM2.5 is expected across Wisconsin on Thursday, with NowCast AQI values in the Very Unhealthy (Purple) category possible. Conditions are expected to slowly improve beginning Friday. However, Unhealthy for Sensitive Groups (Orange) to Unhealthy (Red) AQI will remain possible through the weekend. Conditions will be reevaluated on a day-to-day basis through the weekend, including updates to the forecast and any associated Air Quality Advisories. For more information on current air quality, please see: https://airquality.wi.gov


Air Quality Alert issued July 31 at 10:47AM CDT by NWS Duluth MN

Non-Weather Emergency Message. Not sent to IPAWS.

Effective: Thu July 31, 2025, 10:47 AM
Expires: Fri August 1, 2025, 12:15 PM

The Wisconsin Department of Natural Resources has issued an Air Quality Advisory for the following counties: Ashland, Bayfield, Burnett, Douglas, Iron, Price, Sawyer, Washburn. WHAT...The PM2.5 AQI is expected to reach the Unhealthy level. WHERE...All of Wisconsin WHEN...Until noon Friday, August 1 Precautionary/Preparedness Actions: Sensitive groups: Consider rescheduling or moving all activities inside. Go inside if you have symptoms. People with asthma: Follow your asthma action plan and keep quick-relief medicine handy. People with heart disease: Symptoms such as palpitations, shortness of breath, or unusual fatigue may indicate a serious problem. If you have any of these, contact your health care provider. Everyone else: Keep outdoor activities shorter and less intense. Go inside if you have symptoms. Additional Details: Canadian wildfire smoke will continue to impact Wisconsin`s surface air quality over the next several days. Widespread Unhealthy (Red) AQI for PM2.5 is expected across Wisconsin on Thursday, with NowCast AQI values in the Very Unhealthy (Purple) category possible. Conditions are expected to slowly improve beginning Friday. However, Unhealthy for Sensitive Groups (Orange) to Unhealthy (Red) AQI will remain possible through the weekend. Conditions will be reevaluated on a day-to-day basis through the weekend, including updates to the forecast and any associated Air Quality Advisories. For more information on current air quality, please see: https://airquality.wi.gov


Air Quality Alert issued July 29 at 3:54PM CDT by NWS Duluth MN

Non-Weather Emergency Message. Not sent to IPAWS.

Effective: Tue July 29, 2025, 3:54 PM
Expires: Sat August 2, 2025, 5:00 PM

* WHAT...The Minnesota Pollution Control Agency has issued an Air Quality Alert for fine particles pollution. The Air Quality Index (AQI) is expected to reach the Red or Unhealthy category. * WHERE...West central, east central, central, south central, southeast, north central, northwest, southwest, and northeast Minnesota. * WHEN...Until 5 PM CDT Saturday. * IMPACTS...Some members of the general public may experience health effects. Sensitive groups, such as people with lung disease (including asthma), heart disease, and children and older adults, may experience health effects. * ADDITIONAL DETAILS...Northerly winds will continue transporting waves of heavy surface smoke from wildfires across Manitoba and Saskatchewan into Minnesota. Smoke will move south across all of Minnesota and linger through Saturday afternoon. The smoke will be reinforced by an area of high pressure that will create light winds and limit the dispersion of smoke. Therefore the air quality alert has been expanded to include all of Minnesota and extended until Saturday afternoon when the air quality is forecasted to improve.

Sensitive groups, such as people with lung disease (including asthma), heart disease, and children and older adults, should avoid prolonged or heavy exertion. The general public should limit prolonged or heavy exertion. Reduce or eliminate activities that contribute to air pollution, such as outdoor burning, and use of residential wood burning devices. Reduce vehicle trips and vehicle idling as much as possible. Keep windows closed overnight to prevent smoke from getting indoors.


Air Quality Alert issued July 30 at 4:07PM CDT by NWS Duluth MN

Non-Weather Emergency Message. Not sent to IPAWS.

Effective: Wed July 30, 2025, 4:07 PM
Expires: Sat August 2, 2025, 5:00 PM

* WHAT...The Minnesota Pollution Control Agency has issued an Air Quality Alert for fine particles pollution. The Air Quality Index (AQI) is expected to reach the Purple or Very Unhealthy category. * WHERE....The North Shore of Lake Superior and surrounding areas including Duluth, Two Harbors, Grand Portage, Grand Marais, and Cloquet. * WHEN...Until 5 PM CDT Saturday. * IMPACTS...The risk of health effects is increased for everyone. * ADDITIONAL DETAILS...Northerly winds will continue transporting waves of heavy surface smoke from wildfires across Manitoba and Saskatchewan into Minnesota. Smoke will move south across all of Minnesota and linger through Saturday afternoon. The smoke will be reinforced by an area of high pressure that will create light winds and limit the dispersion of smoke. Heavier smoke is now expected to make it into southern Minnesota, therefore all of Minnesota will likely experience Red/Unhealthy AQI at times through Saturday afternoon when the air quality is forecasted to improve. Very dense smoke is located over Lake Superior, and the AQI forecast has been upgraded to Purple, which is very unhealthy air quality.

Sensitive groups, such as people with lung disease (including asthma), heart disease, and children and older adults, should avoid all physical activities outdoors. The general public should avoid prolonged or heavy exertion. Reduce or eliminate activities that contribute to air pollution, such as outdoor burning, and use of residential wood burning devices. Reduce vehicle trips and vehicle idling as much as possible. Keep windows closed overnight to prevent smoke from getting indoors.


Air Quality Alert issued July 29 at 3:54PM CDT by NWS Duluth MN

Non-Weather Emergency Message. Not sent to IPAWS.

Effective: Tue July 29, 2025, 3:54 PM
Expires: Sat August 2, 2025, 5:00 PM

* WHAT...The Minnesota Pollution Control Agency has issued an Air Quality Alert for fine particles pollution. The Air Quality Index (AQI) is expected to reach the Red or Unhealthy category. * WHERE...West central, east central, central, south central, southeast, north central, northwest, southwest, and northeast Minnesota. * WHEN...Until 5 PM CDT Saturday. * IMPACTS...Some members of the general public may experience health effects. Sensitive groups, such as people with lung disease (including asthma), heart disease, and children and older adults, may experience health effects. * ADDITIONAL DETAILS...Northerly winds will continue transporting waves of heavy surface smoke from wildfires across Manitoba and Saskatchewan into Minnesota. Smoke will move south across all of Minnesota and linger through Saturday afternoon. The smoke will be reinforced by an area of high pressure that will create light winds and limit the dispersion of smoke. Therefore the air quality alert has been expanded to include all of Minnesota and extended until Saturday afternoon when the air quality is forecasted to improve.

Sensitive groups, such as people with lung disease (including asthma), heart disease, and children and older adults, should avoid prolonged or heavy exertion. The general public should limit prolonged or heavy exertion. Reduce or eliminate activities that contribute to air pollution, such as outdoor burning, and use of residential wood burning devices. Reduce vehicle trips and vehicle idling as much as possible. Keep windows closed overnight to prevent smoke from getting indoors.


Thursday, July 31, 2025

Weather Forecast

Conditions: Sunny
Average Temperature: 65°F
Average Humidity: 64%
Chance of Rain: 0%
Wind: 6.5 mph
UV Index: 1.6

Air Quality

AQI: 4 - Unhealthy
PM2.5: 76.48 μg/m3
PM10: 76.79 μg/m3
Carbon Monoxide: 457.39 μg/m3
Nitrogen Dioxide: 4.54 μg/m3
Sulphur Dioxide: 1.69 μg/m3
Ozone: 102.64 μg/m3

Astronomical

Sunrise: 5:47 AM
Sun Transit: 1:14 PM
Sunset: 8:41 PM
Daylight: 14 hrs 54 mins
Moonrise: 1:24 PM
Moon Transit: 6:26 PM
Moonset: 12:01 AM
Moon Phase: First Quarter
Moon Illumination: 36.7%

Best Times for Fishing or Hunting

Major Periods

5:19 AM - 7:49 AM
5:56 PM - 8:26 PM

Minor Periods

12:54 AM - 2:24 PM
12:00 AM - 12:00 AM

Action Rating: 4 out of 5

Friday, August 1, 2025

Weather Forecast

Conditions: Sunny
Average Temperature: 68.4°F
Average Humidity: 59%
Chance of Rain: 0%
Wind: 6.5 mph
UV Index: 1.7

Air Quality

AQI: 3 - Unhealthy for Sensitive Groups
PM2.5: 64.28 μg/m3
PM10: 64.57 μg/m3
Carbon Monoxide: 582.08 μg/m3
Nitrogen Dioxide: 8.81 μg/m3
Sulphur Dioxide: 5.53 μg/m3
Ozone: 122.76 μg/m3

Astronomical

Sunrise: 5:48 AM
Sun Transit: 1:14 PM
Sunset: 8:40 PM
Daylight: 14 hrs 52 mins
Moonrise: 2:32 PM
Moon Transit: 7:09 PM
Moonset: 12:18 AM
Moon Phase: First Quarter
Moon Illumination: 47.9%

Best Times for Fishing or Hunting

Major Periods

6:01 AM - 8:31 AM
6:39 PM - 9:09 PM

Minor Periods

2:02 PM - 3:32 PM
12:00 AM - 12:00 AM

Action Rating: 4 out of 5

Saturday, August 2, 2025

Weather Forecast

Conditions: Partly Cloudy
Average Temperature: 67.3°F
Average Humidity: 66%
Chance of Rain: 0%
Wind: 7.6 mph
UV Index: 1.9

Air Quality

AQI: 3 - Unhealthy for Sensitive Groups
PM2.5: 45.75 μg/m3
PM10: 45.98 μg/m3
Carbon Monoxide: 538.13 μg/m3
Nitrogen Dioxide: 9.18 μg/m3
Sulphur Dioxide: 3.52 μg/m3
Ozone: 126.72 μg/m3

Astronomical

Sunrise: 5:49 AM
Sun Transit: 1:14 PM
Sunset: 8:38 PM
Daylight: 14 hrs 49 mins
Moonrise: 3:41 PM
Moon Transit: 7:56 PM
Moonset: 12:39 AM
Moon Phase: First Quarter
Moon Illumination: 59.1%

Best Times for Fishing or Hunting

Major Periods

6:46 AM - 9:16 AM
7:26 PM - 9:56 PM

Minor Periods

3:11 PM - 4:41 PM
12:00 AM - 12:00 AM

Action Rating: 2 out of 5

Sunday, August 3, 2025

Weather Forecast

Conditions: Heavy rain
Average Temperature: 60.4°F
Average Humidity: 88%
Chance of Rain: 87%
Wind: 7.4 mph
UV Index: 1.2

Air Quality

AQI: 2 - Moderate
PM2.5: 20.08 μg/m3
PM10: 20.22 μg/m3
Carbon Monoxide: 477.15 μg/m3
Nitrogen Dioxide: 8.3 μg/m3
Sulphur Dioxide: 3.57 μg/m3
Ozone: 130.08 μg/m3

Astronomical

Sunrise: 5:51 AM
Sun Transit: 1:14 PM
Sunset: 8:37 PM
Daylight: 14 hrs 46 mins
Moonrise: 4:49 PM
Moon Transit: 8:45 PM
Moonset: 12:05 AM
Moon Phase: First Quarter
Moon Illumination: 70.0%

Best Times for Fishing or Hunting

Major Periods

7:34 AM - 10:04 AM
8:15 PM - 10:45 PM

Minor Periods

4:19 PM - 5:49 PM
12:00 AM - 12:00 AM

Action Rating: 3 out of 5

Monday, August 4, 2025

Weather Forecast

Conditions: Moderate rain
Average Temperature: 61.9°F
Average Humidity: 95%
Chance of Rain: 87%
Wind: 11 mph
UV Index: 0.4

Air Quality

AQI: 1 - Good
PM2.5: 13.92 μg/m3
PM10: 14.23 μg/m3
Carbon Monoxide: 499.64 μg/m3
Nitrogen Dioxide: 12.18 μg/m3
Sulphur Dioxide: 2.99 μg/m3
Ozone: 104.69 μg/m3

Astronomical

Sunrise: 5:52 AM
Sun Transit: 1:13 PM
Sunset: 8:35 PM
Daylight: 14 hrs 44 mins
Moonrise: 5:51 PM
Moon Transit: 9:38 PM
Moonset: 12:39 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 79.8%

Best Times for Fishing or Hunting

Major Periods

8:25 AM - 10:55 AM
9:08 PM - 11:38 PM

Minor Periods

5:21 PM - 6:51 PM
12:09 AM - 1:39 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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