Water Temperature of Grand Marais Harbor in Grand Marais, MN

Current Water Temperature

51.8°F

Measurement Time: Friday, July 25, 2025, 10:18 AM CDT

Temperature Locations

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Local Points of Interest

Lake Superior; Grand Marais Campground and Marina; Grand Marais Municipal Arena

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Grand Marais Harbor

Station Name: 9099090 - Grand Marais, MN
Station Type: Fixed
Data Source: National Data Buoy Center

Elevation Above Sea Level: 617 feet / 188 meters

Nearest Address:
391 MN-61
Grand Marais, MN 55604
Cook County

GPS Coordinates: 47.749, -90.341

Nearby Water Temperatures

Lake Superior, Grand Marais, MN (0.6 mi)
Poplar River, Lutsen, MN (18.8 mi)
Grand Portage River, Grand Portage, MN (33.9 mi)
Lake Superior, Lake Superior, MI (38.4 mi)
Baptism River, Illgen City, MN (49.1 mi)
Kawishiwi River, Ely, MN (56.7 mi)
Washington Creek, Windigo, MI (56.7 mi)
Dunka River, Babbitt, MN (70.8 mi)
Dunka River, Babbitt, MN (71.1 mi)
Partrige River, Babbitt, MN (74.2 mi)
Lake Superior, Two Harbors, MN (79.9 mi)
Saint Louis River, Hoyt Lakes, MN (81.3 mi)
Chequamegon Bay, Ashland, WI (81.3 mi)
Presque Isle River, Tula, MI (87.2 mi)
Lake Superior, Calumet, MI (87.4 mi)

Weather for Grand Marais, Minnesota

Current Weather

72°F
Partly Cloudy
Conditions: Partly Cloudy
Humidity: 73%
Feels Like: 76.3°F
Wind: S 4.7 mph
Wind Gusts: 7.8 mph
Pressure: 30.08 in
Precipitation: 0 in
Cloud Cover: 0%
Visibility: 6 mi
UV Index: 5.3

Five Day Weather Forecast

Partly Cloudy
Fri
H: 69°F
L: 61°F
Fog
Sat
H: 71°F
L: 60°F
Moderate rain
Sun
H: 77°F
L: 63°F
Patchy rain nearby
Mon
H: 77°F
L: 64°F
Sunny
Tue
H: 76°F
L: 58°F

Air Quality

AQI: 2 - Moderate
PM2.5: 31.38 μg/m3
PM10: 31.72 μg/m3
Carbon Monoxide: 604.16 μg/m3
Nitrogen Dioxide: 3.36 μg/m3
Sulphur Dioxide: 0.17 μg/m3
Ozone: 100 μg/m3

Astronomical

Sunrise: 5:30 AM
Sun Transit: 1:07 PM
Sunset: 8:45 PM
Daylight: 15 hrs 15 mins
Moonrise: 6:10 AM
Moon Transit: 2:02 PM
Moonset: 9:37 PM
Moon Phase: New
Moon Illumination: 3.1%

Best Times for Fishing or Hunting

Major Periods

1:03 AM - 3:33 AM
1:32 PM - 4:02 PM

Minor Periods

9:07 PM - 10:37 PM
5:40 AM - 7:10 AM

Action Rating: 5 out of 5

Air Quality Alert issued July 23 at 3:35PM CDT by NWS Duluth MN

Non-Weather Emergency Message. Not sent to IPAWS.

Effective: Wed July 23, 2025, 3:35 PM
Expires: Fri July 25, 2025, 11:00 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...North central and northeast Minnesota. * WHEN...Until 11 PM CDT Friday. * 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...A band of heavy smoke from wildfires in Saskatchewan and Manitoba is moving south across northwest Minnesota on Wednesday. The smoke will remain over the northwest part of the state through the end of Wednesday, but by Thursday morning the smoke will reach southwest MN. Smoke will also move into the northeast and central portions of the state Thursday morning, and by Thursday afternoon smoke will reach east central and south central MN. Some uncertainty remains regarding how far south the ground-level smoke will reach by Friday morning, when winds are expected to become southerly and push the smoke back to the north. Air quality should improve gradually from south to north beginning Friday afternoon, with improvement in fine particle levels below the alert threshold expected by the end of Friday.

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 23 at 3:35PM CDT by NWS Duluth MN

Non-Weather Emergency Message. Not sent to IPAWS.

Effective: Wed July 23, 2025, 3:35 PM
Expires: Fri July 25, 2025, 11:00 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...North central and northeast Minnesota. * WHEN...Until 11 PM CDT Friday. * 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...A band of heavy smoke from wildfires in Saskatchewan and Manitoba is moving south across northwest Minnesota on Wednesday. The smoke will remain over the northwest part of the state through the end of Wednesday, but by Thursday morning the smoke will reach southwest MN. Smoke will also move into the northeast and central portions of the state Thursday morning, and by Thursday afternoon smoke will reach east central and south central MN. Some uncertainty remains regarding how far south the ground-level smoke will reach by Friday morning, when winds are expected to become southerly and push the smoke back to the north. Air quality should improve gradually from south to north beginning Friday afternoon, with improvement in fine particle levels below the alert threshold expected by the end of Friday.

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 23 at 3:35PM CDT by NWS Duluth MN

Non-Weather Emergency Message. Not sent to IPAWS.

Effective: Wed July 23, 2025, 3:35 PM
Expires: Fri July 25, 2025, 11:00 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...North central and northeast Minnesota. * WHEN...Until 11 PM CDT Friday. * 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...A band of heavy smoke from wildfires in Saskatchewan and Manitoba is moving south across northwest Minnesota on Wednesday. The smoke will remain over the northwest part of the state through the end of Wednesday, but by Thursday morning the smoke will reach southwest MN. Smoke will also move into the northeast and central portions of the state Thursday morning, and by Thursday afternoon smoke will reach east central and south central MN. Some uncertainty remains regarding how far south the ground-level smoke will reach by Friday morning, when winds are expected to become southerly and push the smoke back to the north. Air quality should improve gradually from south to north beginning Friday afternoon, with improvement in fine particle levels below the alert threshold expected by the end of Friday.

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 23 at 3:35PM CDT by NWS Duluth MN

Non-Weather Emergency Message. Not sent to IPAWS.

Effective: Wed July 23, 2025, 3:35 PM
Expires: Fri July 25, 2025, 11:00 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...North central and northeast Minnesota. * WHEN...Until 11 PM CDT Friday. * 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...A band of heavy smoke from wildfires in Saskatchewan and Manitoba is moving south across northwest Minnesota on Wednesday. The smoke will remain over the northwest part of the state through the end of Wednesday, but by Thursday morning the smoke will reach southwest MN. Smoke will also move into the northeast and central portions of the state Thursday morning, and by Thursday afternoon smoke will reach east central and south central MN. Some uncertainty remains regarding how far south the ground-level smoke will reach by Friday morning, when winds are expected to become southerly and push the smoke back to the north. Air quality should improve gradually from south to north beginning Friday afternoon, with improvement in fine particle levels below the alert threshold expected by the end of Friday.

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.


Friday, July 25, 2025

Weather Forecast

Conditions: Partly Cloudy
Average Temperature: 65.2°F
Average Humidity: 84%
Chance of Rain: 0%
Wind: 6.5 mph
UV Index: 1.6

Air Quality

AQI: 2 - Moderate
PM2.5: 34.13 μg/m3
PM10: 34.36 μg/m3
Carbon Monoxide: 562.67 μg/m3
Nitrogen Dioxide: 3.55 μg/m3
Sulphur Dioxide: 0.21 μg/m3
Ozone: 77.04 μg/m3

Astronomical

Sunrise: 5:30 AM
Sun Transit: 1:07 PM
Sunset: 8:45 PM
Daylight: 15 hrs 15 mins
Moonrise: 6:10 AM
Moon Transit: 2:02 PM
Moonset: 9:37 PM
Moon Phase: New
Moon Illumination: 3.1%

Best Times for Fishing or Hunting

Major Periods

1:03 AM - 3:33 AM
1:32 PM - 4:02 PM

Minor Periods

9:07 PM - 10:37 PM
5:40 AM - 7:10 AM

Action Rating: 5 out of 5

Saturday, July 26, 2025

Weather Forecast

Conditions: Fog
Average Temperature: 64.6°F
Average Humidity: 96%
Chance of Rain: 0%
Wind: 16.1 mph
UV Index: 2.2

Air Quality

AQI: 2 - Moderate
PM2.5: 27.42 μg/m3
PM10: 28.12 μg/m3
Carbon Monoxide: 477.76 μg/m3
Nitrogen Dioxide: 3.03 μg/m3
Sulphur Dioxide: 0.48 μg/m3
Ozone: 98.72 μg/m3

Astronomical

Sunrise: 5:31 AM
Sun Transit: 1:07 PM
Sunset: 8:44 PM
Daylight: 15 hrs 13 mins
Moonrise: 7:29 AM
Moon Transit: 2:50 PM
Moonset: 9:55 PM
Moon Phase: New
Moon Illumination: 0.7%

Best Times for Fishing or Hunting

Major Periods

1:54 AM - 4:24 AM
2:20 PM - 4:50 PM

Minor Periods

9:25 PM - 10:55 PM
6:59 AM - 8:29 AM

Action Rating: 3 out of 5

Sunday, July 27, 2025

Weather Forecast

Conditions: Moderate rain
Average Temperature: 69.5°F
Average Humidity: 92%
Chance of Rain: 78%
Wind: 27.3 mph
UV Index: 1.4

Air Quality

AQI: 1 - Good
PM2.5: 7.76 μg/m3
PM10: 8.49 μg/m3
Carbon Monoxide: 289.39 μg/m3
Nitrogen Dioxide: 4.14 μg/m3
Sulphur Dioxide: 0.1 μg/m3
Ozone: 82 μg/m3

Astronomical

Sunrise: 5:32 AM
Sun Transit: 1:07 PM
Sunset: 8:43 PM
Daylight: 15 hrs 10 mins
Moonrise: 8:44 AM
Moon Transit: 3:35 PM
Moonset: 10:11 PM
Moon Phase: New
Moon Illumination: 3.8%

Best Times for Fishing or Hunting

Major Periods

2:40 AM - 5:10 AM
3:05 PM - 5:35 PM

Minor Periods

9:41 PM - 11:11 PM
8:14 AM - 9:44 AM

Action Rating: 4 out of 5

Monday, July 28, 2025

Weather Forecast

Conditions: Patchy rain nearby
Average Temperature: 69.6°F
Average Humidity: 84%
Chance of Rain: 84%
Wind: 8.9 mph
UV Index: 1.9

Air Quality

AQI: 1 - Good
PM2.5: 5.66 μg/m3
PM10: 6.11 μg/m3
Carbon Monoxide: 239.58 μg/m3
Nitrogen Dioxide: 2.31 μg/m3
Sulphur Dioxide: 0.2 μg/m3
Ozone: 95.36 μg/m3

Astronomical

Sunrise: 5:34 AM
Sun Transit: 1:07 PM
Sunset: 8:41 PM
Daylight: 15 hrs 8 mins
Moonrise: 9:55 AM
Moon Transit: 4:17 PM
Moonset: 10:25 PM
Moon Phase: Waxing Crescent
Moon Illumination: 9.3%

Best Times for Fishing or Hunting

Major Periods

3:23 AM - 5:53 AM
3:47 PM - 6:17 PM

Minor Periods

9:55 PM - 11:25 PM
9:25 AM - 10:55 AM

Action Rating: 3 out of 5

Tuesday, July 29, 2025

Weather Forecast

Conditions: Sunny
Average Temperature: 67°F
Average Humidity: 61%
Chance of Rain: 0%
Wind: 10.7 mph
UV Index: 0

Air Quality

AQI: 2 - Moderate
PM2.5: 24.53 μg/m3
PM10: 24.54 μg/m3
Carbon Monoxide: 376.05 μg/m3
Nitrogen Dioxide: 2.08 μg/m3
Sulphur Dioxide: 0.36 μg/m3
Ozone: 71.85 μg/m3

Astronomical

Sunrise: 5:35 AM
Sun Transit: 1:07 PM
Sunset: 8:40 PM
Daylight: 15 hrs 5 mins
Moonrise: 11:04 AM
Moon Transit: 4:57 PM
Moonset: 10:39 PM
Moon Phase: Waxing Crescent
Moon Illumination: 16.9%

Best Times for Fishing or Hunting

Major Periods

4:04 AM - 6:34 AM
4:27 PM - 6:57 PM

Minor Periods

10:09 PM - 11:39 PM
10:34 AM - 12:04 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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