Water Temperature of the South Branch Au Sable River in Grayling, MI

Current Water Temperature

50.9°F

Measurement Time: Wednesday, October 8, 2025, 12:30 AM EDT

Temperature Locations

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Local Points of Interest

Au Sable State Forest-Grayling Unit; Luzerne, MI

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South Branch Au Sable River

Station Name: SOUTH BRANCH AU SABLE RIVER NEAR LUZERNE, MI
Data Source: Water Data - usgc.gov

Elevation Above Sea Level: 1,070 feet / 326 meters

Nearest Address:
7801 Old M-72
Grayling, MI 49738
Crawford County

GPS Coordinates: 44.61473849, -84.455575

Nearby Water Temperatures

North Branch Au Sable River, Grayling, MI (7.3 mi)
Au Sable River, Luzerne, MI (9.1 mi)
Au Sable River, Mio, MI (16.3 mi)
Manistee River, Grayling, MI (20.0 mi)
Au Sable River, Curran, MI (30.4 mi)
Au Sable River, Glennie, MI (32.3 mi)
Au Sable River, South Branch, MI (37.6 mi)
Au Sable River, Glennie, MI (40.0 mi)
Rifle River, Sterling, MI (43.2 mi)
Au Sable River, Oscoda, MI (44.6 mi)
Au Sable River, Oscoda, MI (51.8 mi)
Thunder Bay River, Alpena, MI (59.1 mi)
Manistee River, Mesick, MI (62.5 mi)
Little Traverse Bay, Petoskey, MI (62.7 mi)
Lake Huron, Alpena, MI (63.6 mi)

Weather for Grayling, Michigan

Current Weather

39.9°F
Clear
Conditions: Clear
Humidity: 83%
Feels Like: 36.1°F
Wind: NNW 5.4 mph
Wind Gusts: 10.8 mph
Pressure: 30.29 in
Precipitation: 0 in
Cloud Cover: 0%
Visibility: 9 mi
UV Index: 0

Five Day Weather Forecast

Sunny
Wed
H: 57°F
L: 37°F
Sunny
Thu
H: 58°F
L: 35°F
Overcast
Fri
H: 59°F
L: 40°F
Patchy rain nearby
Sat
H: 55°F
L: 46°F
Patchy rain nearby
Sun
H: 63°F
L: 51°F

Air Quality

AQI: 1 - Good
PM2.5: 1.65 μg/m3
PM10: 1.65 μg/m3
Carbon Monoxide: 133.85 μg/m3
Nitrogen Dioxide: 1.85 μg/m3
Sulphur Dioxide: 1.25 μg/m3
Ozone: 66 μg/m3

Astronomical

Sunrise: 7:45 AM
Sun Transit: 1:25 PM
Sunset: 7:05 PM
Daylight: 11 hrs 20 mins
Moonrise: 7:37 PM
Moon Transit: 2:18 AM
Moonset: 9:44 AM
Moon Phase: Full
Moon Illumination: 95.8%

Best Times for Fishing or Hunting

Major Periods

1:48 AM - 4:18 AM
3:02 PM - 5:32 PM

Minor Periods

7:07 PM - 8:37 PM
9:14 AM - 10:44 AM

Action Rating: 4 out of 5

Frost Advisory issued October 7 at 11:11PM EDT until October 8 at 8:00AM EDT by NWS Gaylord MI

Effective: Tue October 7, 2025, 11:11 PM
Expires: Wed October 8, 2025, 8:00 AM

* WHAT...Temperatures as low as 32 will result in frost formation. * WHERE...A portion of Northern Lower Michigan. * WHEN...Until 8 AM EDT Wednesday. * IMPACTS...Frost could harm sensitive outdoor vegetation. Sensitive outdoor plants may be killed if left uncovered.

Take steps now to protect tender plants from the cold.
Wednesday, October 8, 2025

Weather Forecast

Conditions: Sunny
Average Temperature: 46.7°F
Average Humidity: 64%
Chance of Rain: 0%
Wind: 8.7 mph
UV Index: 0.9

Air Quality

AQI: 1 - Good
PM2.5: 1.96 μg/m3
PM10: 2 μg/m3
Carbon Monoxide: 137.49 μg/m3
Nitrogen Dioxide: 1.99 μg/m3
Sulphur Dioxide: 1.24 μg/m3
Ozone: 71 μg/m3

Astronomical

Sunrise: 7:45 AM
Sun Transit: 1:25 PM
Sunset: 7:05 PM
Daylight: 11 hrs 20 mins
Moonrise: 7:37 PM
Moon Transit: 2:18 AM
Moonset: 9:44 AM
Moon Phase: Full
Moon Illumination: 95.8%

Best Times for Fishing or Hunting

Major Periods

1:48 AM - 4:18 AM
3:02 PM - 5:32 PM

Minor Periods

7:07 PM - 8:37 PM
9:14 AM - 10:44 AM

Action Rating: 4 out of 5

Thursday, October 9, 2025

Weather Forecast

Conditions: Sunny
Average Temperature: 46.2°F
Average Humidity: 54%
Chance of Rain: 0%
Wind: 5.8 mph
UV Index: 0.8

Air Quality

AQI: 1 - Good
PM2.5: 2 μg/m3
PM10: 2.07 μg/m3
Carbon Monoxide: 144.13 μg/m3
Nitrogen Dioxide: 3.72 μg/m3
Sulphur Dioxide: 1.11 μg/m3
Ozone: 66.44 μg/m3

Astronomical

Sunrise: 7:46 AM
Sun Transit: 1:24 PM
Sunset: 7:03 PM
Daylight: 11 hrs 17 mins
Moonrise: 8:12 PM
Moon Transit: 3:14 AM
Moonset: 11:09 AM
Moon Phase: Waning Gibbous
Moon Illumination: 90.1%

Best Times for Fishing or Hunting

Major Periods

2:44 AM - 5:14 AM
4:01 PM - 6:31 PM

Minor Periods

7:42 PM - 9:12 PM
10:39 AM - 12:09 AM

Action Rating: 2 out of 5

Friday, October 10, 2025

Weather Forecast

Conditions: Overcast
Average Temperature: 49.7°F
Average Humidity: 69%
Chance of Rain: 0%
Wind: 12.5 mph
UV Index: 0.5

Air Quality

AQI: 1 - Good
PM2.5: 4.43 μg/m3
PM10: 4.49 μg/m3
Carbon Monoxide: 173.93 μg/m3
Nitrogen Dioxide: 5.39 μg/m3
Sulphur Dioxide: 1.97 μg/m3
Ozone: 69.24 μg/m3

Astronomical

Sunrise: 7:47 AM
Sun Transit: 1:24 PM
Sunset: 7:01 PM
Daylight: 11 hrs 14 mins
Moonrise: 8:56 PM
Moon Transit: 4:15 AM
Moonset: 12:34 AM
Moon Phase: Waning Gibbous
Moon Illumination: 82.3%

Best Times for Fishing or Hunting

Major Periods

3:45 AM - 6:15 AM
5:03 PM - 7:33 PM

Minor Periods

8:26 PM - 9:56 PM
12:04 AM - 1:34 PM

Action Rating: 2 out of 5

Saturday, October 11, 2025

Weather Forecast

Conditions: Patchy rain nearby
Average Temperature: 50.8°F
Average Humidity: 92%
Chance of Rain: 87%
Wind: 7.6 mph
UV Index: 0.5

Air Quality

AQI: 1 - Good
PM2.5: 3.68 μg/m3
PM10: 3.75 μg/m3
Carbon Monoxide: 198.05 μg/m3
Nitrogen Dioxide: 2.72 μg/m3
Sulphur Dioxide: 1.37 μg/m3
Ozone: 78.28 μg/m3

Astronomical

Sunrise: 7:48 AM
Sun Transit: 1:24 PM
Sunset: 7:00 PM
Daylight: 11 hrs 11 mins
Moonrise: 9:52 PM
Moon Transit: 5:19 AM
Moonset: 1:49 PM
Moon Phase: Waning Gibbous
Moon Illumination: 72.9%

Best Times for Fishing or Hunting

Major Periods

4:49 AM - 7:19 AM
6:07 PM - 8:37 PM

Minor Periods

9:22 PM - 10:52 PM
1:19 PM - 2:49 PM

Action Rating: 3 out of 5

Sunday, October 12, 2025

Weather Forecast

Conditions: Patchy rain nearby
Average Temperature: 56°F
Average Humidity: 86%
Chance of Rain: 87%
Wind: 9.8 mph
UV Index: 0

Air Quality

AQI: 1 - Good
PM2.5: 7.54 μg/m3
PM10: 7.67 μg/m3
Carbon Monoxide: 190.08 μg/m3
Nitrogen Dioxide: 3.42 μg/m3
Sulphur Dioxide: 3.43 μg/m3
Ozone: 85.23 μg/m3

Astronomical

Sunrise: 7:50 AM
Sun Transit: 1:24 PM
Sunset: 6:58 PM
Daylight: 11 hrs 8 mins
Moonrise: 11:00 PM
Moon Transit: 6:22 AM
Moonset: 2:51 PM
Moon Phase: Waning Gibbous
Moon Illumination: 62.3%

Best Times for Fishing or Hunting

Major Periods

5:52 AM - 8:22 AM
7:10 PM - 9:40 PM

Minor Periods

12:00 AM - 12:00 AM
2:21 PM - 3:51 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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