Water Temperature of Lake Superior in Grand Marais, MN

Current Water Temperature

50.0°F

Measurement Time: Thursday, September 8, 2022, 8:00 AM CDT

Temperature Locations

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Lake Superior

Station Name: Grand Marais
Data Source: USGS

Elevation Above Sea Level: 607 feet / 185 meters

Nearest Address:
2nd Street
Grand Marais, MN 55604
Cook County

GPS Coordinates: 47.7517, -90.3283

Nearby Water Temperatures

Grand Marais Harbor, Grand Marais, MN (0.6 mi)
Poplar River, Lutsen, MN (19.4 mi)
Grand Portage River, Grand Portage, MN (33.3 mi)
Lake Superior, Lake Superior, MI (38.1 mi)
Baptism River, Illgen City, MN (49.7 mi)
Washington Creek, Windigo, MI (56.1 mi)
Kawishiwi River, Ely, MN (57.2 mi)
Dunka River, Babbitt, MN (71.4 mi)
Dunka River, Babbitt, MN (71.7 mi)
Partrige River, Babbitt, MN (74.9 mi)
Lake Superior, Two Harbors, MN (80.5 mi)
Chequamegon Bay, Ashland, WI (81.7 mi)
Saint Louis River, Hoyt Lakes, MN (81.9 mi)
Lake Superior, Calumet, MI (86.9 mi)
Presque Isle River, Tula, MI (87.2 mi)

Weather for Grand Marais, Minnesota

Current Weather

57.9°F
Partly Cloudy
Conditions: Partly Cloudy
Humidity: 75%
Feels Like: 58.1°F
Wind: NNE 3.8 mph
Wind Gusts: 8 mph
Pressure: 30.08 in
Precipitation: 0 in
Cloud Cover: 0%
Visibility: 6 mi
UV Index: 0

Five Day Weather Forecast

Partly Cloudy
Sun
H: 69°F
L: 55°F
Overcast
Mon
H: 64°F
L: 57°F
Heavy rain
Tue
H: 63°F
L: 55°F
Heavy rain
Wed
H: 75°F
L: 59°F
Moderate rain
Thu
H: 71°F
L: 58°F

Air Quality

AQI: 1 - Good
PM2.5: 8.06 μg/m3
PM10: 8.22 μg/m3
Carbon Monoxide: 260.12 μg/m3
Nitrogen Dioxide: 1.68 μg/m3
Sulphur Dioxide: 0.34 μg/m3
Ozone: 62 μg/m3

Astronomical

Sunrise: 5:24 AM
Sun Transit: 1:07 PM
Sunset: 8:51 PM
Daylight: 15 hrs 27 mins
Moonrise: 12:46 AM
Moon Transit: 9:03 AM
Moonset: 5:35 PM
Moon Phase: Waning Crescent
Moon Illumination: 14.4%

Best Times for Fishing or Hunting

Major Periods

8:33 AM - 11:03 AM
9:00 PM - 11:30 PM

Minor Periods

5:05 PM - 6:35 PM
12:16 AM - 1:46 AM

Action Rating: 3 out of 5

Air Quality Alert issued July 18 at 2:29PM CDT by NWS Duluth MN

Non-Weather Emergency Message. Not sent to IPAWS.

Effective: Fri July 18, 2025, 2:29 PM
Expires: Mon July 21, 2025, 9:00 AM

* 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...North central, northeast, and northwest Minnesota. * WHEN...1 PM CDT Saturday until 9 AM CDT Monday. * IMPACTS...The risk of health effects is increased for everyone. * ADDITIONAL DETAILS...Heavy surface smoke from Canadian wildfires will drift south into Minnesota over the next several days. This smoke will initially impact far northern Minnesota early Saturday afternoon and then spread south and east through the rest of the day and into the evening. Smoke lingers across the region on Sunday with light winds in place, and then exits back to the north through Monday morning. The highest smoke concentrations are expected to be across far northern Minnesota and the Arrowhead region from Saturday into Sunday.

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 19 at 8:14AM CDT by NWS Duluth MN

Non-Weather Emergency Message. Not sent to IPAWS.

Effective: Sat July 19, 2025, 8:14 AM
Expires: Mon July 21, 2025, 9:00 AM

* 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...North central, northeast, and northwest Minnesota. * WHEN...1 PM CDT Saturday until 9 AM CDT Monday. * IMPACTS...The risk of health effects is increased for everyone. * ADDITIONAL DETAILS...Heavy surface smoke from Canadian wildfires will drift south into Minnesota over the next several days. This smoke will initially impact far northern Minnesota early Saturday afternoon and then spread south and east through the rest of the day and into the evening. Smoke lingers across the region on Sunday with light winds in place, and then exits back to the north through Monday morning. The highest smoke concentrations are expected to be across far northern Minnesota and the Arrowhead region from Saturday into Sunday.

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 18 at 2:29PM CDT by NWS Duluth MN

Non-Weather Emergency Message. Not sent to IPAWS.

Effective: Fri July 18, 2025, 2:29 PM
Expires: Mon July 21, 2025, 9:00 AM

* 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...North central, northeast, and northwest Minnesota. * WHEN...1 PM CDT Saturday until 9 AM CDT Monday. * IMPACTS...The risk of health effects is increased for everyone. * ADDITIONAL DETAILS...Heavy surface smoke from Canadian wildfires will drift south into Minnesota over the next several days. This smoke will initially impact far northern Minnesota early Saturday afternoon and then spread south and east through the rest of the day and into the evening. Smoke lingers across the region on Sunday with light winds in place, and then exits back to the north through Monday morning. The highest smoke concentrations are expected to be across far northern Minnesota and the Arrowhead region from Saturday into Sunday.

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 19 at 8:14AM CDT by NWS Duluth MN

Non-Weather Emergency Message. Not sent to IPAWS.

Effective: Sat July 19, 2025, 8:14 AM
Expires: Mon July 21, 2025, 9:00 AM

* 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...North central, northeast, and northwest Minnesota. * WHEN...1 PM CDT Saturday until 9 AM CDT Monday. * IMPACTS...The risk of health effects is increased for everyone. * ADDITIONAL DETAILS...Heavy surface smoke from Canadian wildfires will drift south into Minnesota over the next several days. This smoke will initially impact far northern Minnesota early Saturday afternoon and then spread south and east through the rest of the day and into the evening. Smoke lingers across the region on Sunday with light winds in place, and then exits back to the north through Monday morning. The highest smoke concentrations are expected to be across far northern Minnesota and the Arrowhead region from Saturday into Sunday.

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 20 at 3:53PM CDT by NWS Duluth MN

Non-Weather Emergency Message. Not sent to IPAWS.

Effective: Sun July 20, 2025, 3:53 PM
Expires: Mon July 21, 2025, 9:00 AM

* WHAT...The Minnesota Pollution Control Agency has continued an Air Quality Alert for fine particles pollution. The Air Quality Index (AQI) is expected to reach the Red or Unhealthy category. * WHERE...East central, north central, northwest, and northeast Minnesota. * WHEN...Until 9 AM CDT Monday. * 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...Moderate to heavy surface smoke from Canadian wildfires will remain draped across much of northern and central Minnesota through the evening before retreating back north and exiting the region through the morning on Monday. Based on the latest observations and model data, the air quality alert has been expanded a bit further south into central Minnesota, and has been cancelled across much of northeastern Minnesota.

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.


Sunday, July 20, 2025

Weather Forecast

Conditions: Partly Cloudy
Average Temperature: 61°F
Average Humidity: 77%
Chance of Rain: 0%
Wind: 7.6 mph
UV Index: 1.8

Air Quality

AQI: 3 - Unhealthy for Sensitive Groups
PM2.5: 47.7 μg/m3
PM10: 48.14 μg/m3
Carbon Monoxide: 346.12 μg/m3
Nitrogen Dioxide: 2.58 μg/m3
Sulphur Dioxide: 0.42 μg/m3
Ozone: 69.56 μg/m3

Astronomical

Sunrise: 5:24 AM
Sun Transit: 1:07 PM
Sunset: 8:51 PM
Daylight: 15 hrs 27 mins
Moonrise: 12:46 AM
Moon Transit: 9:03 AM
Moonset: 5:35 PM
Moon Phase: Waning Crescent
Moon Illumination: 14.4%

Best Times for Fishing or Hunting

Major Periods

8:33 AM - 11:03 AM
9:00 PM - 11:30 PM

Minor Periods

5:05 PM - 6:35 PM
12:16 AM - 1:46 AM

Action Rating: 3 out of 5

Monday, July 21, 2025

Weather Forecast

Conditions: Overcast
Average Temperature: 59.1°F
Average Humidity: 75%
Chance of Rain: 0%
Wind: 9.4 mph
UV Index: 1.2

Air Quality

AQI: 1 - Good
PM2.5: 10.04 μg/m3
PM10: 10.15 μg/m3
Carbon Monoxide: 274.02 μg/m3
Nitrogen Dioxide: 1.93 μg/m3
Sulphur Dioxide: 0.28 μg/m3
Ozone: 63.64 μg/m3

Astronomical

Sunrise: 5:25 AM
Sun Transit: 1:07 PM
Sunset: 8:50 PM
Daylight: 15 hrs 25 mins
Moonrise: 1:26 AM
Moon Transit: 10:04 AM
Moonset: 6:52 PM
Moon Phase: Waning Crescent
Moon Illumination: 7.4%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
9:34 AM - 12:04 AM

Minor Periods

6:22 PM - 7:52 PM
12:56 AM - 2:26 AM

Action Rating: 2 out of 5

Tuesday, July 22, 2025

Weather Forecast

Conditions: Heavy rain
Average Temperature: 58.3°F
Average Humidity: 92%
Chance of Rain: 85%
Wind: 6 mph
UV Index: 1.7

Air Quality

AQI: 1 - Good
PM2.5: 8.25 μg/m3
PM10: 8.59 μg/m3
Carbon Monoxide: 296.84 μg/m3
Nitrogen Dioxide: 2.56 μg/m3
Sulphur Dioxide: 0.43 μg/m3
Ozone: 76.08 μg/m3

Astronomical

Sunrise: 5:26 AM
Sun Transit: 1:07 PM
Sunset: 8:49 PM
Daylight: 15 hrs 22 mins
Moonrise: 2:21 AM
Moon Transit: 11:08 AM
Moonset: 7:53 PM
Moon Phase: Waning Crescent
Moon Illumination: 2.6%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
10:38 AM - 1:08 PM

Minor Periods

7:23 PM - 8:53 PM
1:51 AM - 3:21 AM

Action Rating: 3 out of 5

Wednesday, July 23, 2025

Weather Forecast

Conditions: Heavy rain
Average Temperature: 66.4°F
Average Humidity: 93%
Chance of Rain: 85%
Wind: 6.9 mph
UV Index: 1

Air Quality

AQI: 1 - Good
PM2.5: 4.22 μg/m3
PM10: 4.5 μg/m3
Carbon Monoxide: 301.27 μg/m3
Nitrogen Dioxide: 3.33 μg/m3
Sulphur Dioxide: 0.21 μg/m3
Ozone: 99.64 μg/m3

Astronomical

Sunrise: 5:27 AM
Sun Transit: 1:07 PM
Sunset: 8:47 PM
Daylight: 15 hrs 20 mins
Moonrise: 3:30 AM
Moon Transit: 12:10 AM
Moonset: 8:40 PM
Moon Phase: Waning Crescent
Moon Illumination: 0.2%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
11:40 AM - 2:10 PM

Minor Periods

8:10 PM - 9:40 PM
3:00 AM - 4:30 AM

Action Rating: 2 out of 5

Thursday, July 24, 2025

Weather Forecast

Conditions: Moderate rain
Average Temperature: 63.8°F
Average Humidity: 94%
Chance of Rain: 83%
Wind: 9.2 mph
UV Index: 1.2

Air Quality

AQI: 1 - Good
PM2.5: 6.82 μg/m3
PM10: 7.94 μg/m3
Carbon Monoxide: 310.08 μg/m3
Nitrogen Dioxide: 3.07 μg/m3
Sulphur Dioxide: 0.09 μg/m3
Ozone: 79.85 μg/m3

Astronomical

Sunrise: 5:29 AM
Sun Transit: 1:07 PM
Sunset: 8:46 PM
Daylight: 15 hrs 18 mins
Moonrise: 4:49 AM
Moon Transit: 1:09 PM
Moonset: 9:12 PM
Moon Phase: New
Moon Illumination: 0.4%

Best Times for Fishing or Hunting

Major Periods

12:07 AM - 2:37 AM
12:39 AM - 3:09 PM

Minor Periods

8:42 PM - 10:12 PM
4:19 AM - 5:49 AM

Action Rating: 5 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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