Water Temperature of the Madison River in Grayling, MT

Current Water Temperature

48.7°F

Measurement Time: Friday, May 15, 2026, 3:45 AM MDT

Temperature Locations

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Local Points of Interest

Hebgen Lake; West Yellowstone, MT

Madison River

Station Name: Madison River bl Hebgen Lake nr Grayling MT
Data Source: Water Data - usgc.gov

Elevation Above Sea Level: 6,503 feet

Nearest Address:
8998 Hebgen Lake Rd
Grayling, MT 59758
Gallatin County

GPS Coordinates: 44.86639167, -111.3387806

Nearby Water Temperatures

Madison River, Cameron, MT (12 mi)
Madison River, West Yellowstone, MT (19.6 mi)
Gibbon River, Yellowstone National Park, WY (28.1 mi)
Firehole River, Yellowstone National Park, WY (28.9 mi)
Yellowstone River, Corwin Springs, MT (31.6 mi)
Tantalus Creek, Yellowstone National Park, WY (32 mi)
Madison River, Ennis, MT (32.4 mi)
Boiling River Hot Springs, Yellowstone National Park, WY (32.8 mi)
Firehole River, Yellowstone National Park, WY (37.9 mi)
Madison River, Norris, MT (45.4 mi)
Lamar River, Yellowstone National Park, WY (46.4 mi)
Snake River, Flagg Ranch, WY (62.5 mi)
Ruby River, Twin Bridges, MT (65.5 mi)
Jefferson River, Twin Bridges, MT (70.6 mi)
Big Hole River, Glen, MT (71.3 mi)

Weather for Grayling, Montana

Current Weather

50.5°F
Sunny
Sunny
47.4°F
44.8°F
34%
WSW 8.1 mph
9.3 mph
40.7°F
19.1°F
0 in
0%
9 mi
1016 mbar
1.8

Five Day Weather Forecast

Sunny
Fri
H: 56°F
L: 28°F
Patchy rain nearby
Sat
H: 47°F
L: 32°F
Moderate or heavy snow showers
Sun
H: 36°F
L: 25°F
Partly Cloudy
Mon
H: 44°F
L: 19°F
Moderate rain
Tue
H: 46°F
L: 20°F

Air Quality

AQI: 1 - Good
PM2.5: 2.65 μg/m3
PM10: 4.45 μg/m3
Carbon Monoxide: 130.85 μg/m3
Nitrogen Dioxide: 0.95 μg/m3
Sulphur Dioxide: 1.25 μg/m3
Ozone: 119 μg/m3

Astronomical

Sunrise: 5:57 AM
Sun Transit: 1:21 PM
Sunset: 8:48 PM
Daylight: 14 hrs 51 mins
Moonrise: 4:47 AM
Moon Transit: 12:14 AM
Moonset: 8:00 PM
Moon Phase: New
Moon Illumination: 0.1%

Best Times for Fishing or Hunting

Major Periods

9:16 PM - 11:46 PM
11:44 AM - 2:14 PM

Minor Periods

7:30 PM - 9:00 PM
4:17 AM - 5:47 AM

Action Rating: 6 out of 5

Wind Advisory issued May 14 at 7:31PM MDT until May 15 at 9:00PM MDT by NWS Pocatello ID

Effective: Thu May 14, 2026, 7:31 PM
Expires: Fri May 15, 2026, 6:15 AM

* WHAT...Southwest winds 20 to 30 mph with gusts up to 45 mph expected. * WHERE...Arco/Mud Lake Desert and Upper Snake River Plain. * WHEN...From 10 AM to 9 PM MDT Friday. * IMPACTS...Gusty winds could make driving difficult, especially for high profile vehicles. Unsecured objects may be blown around. Strong winds and rough waves on area lakes will create hazardous conditions for small craft.

Winds this strong can make driving difficult, especially for high profile vehicles. Use extra caution. Secure outdoor objects. Boaters on area lakes should use extra caution since strong winds and rough waves can overturn small craft.


Wind Advisory issued May 15 at 12:49AM MDT until May 15 at 9:00PM MDT by NWS Pocatello ID

Effective: Fri May 15, 2026, 12:49 AM
Expires: Fri May 15, 2026, 9:00 PM

* WHAT...Southwest winds 25 to 35 mph with gusts up to 50 mph expected. * WHERE...Arco/Mud Lake Desert and Upper Snake River Plain. * WHEN...From 10 AM this morning to 9 PM MDT this evening. * IMPACTS...Gusty winds could make driving difficult, especially for high profile vehicles. Unsecured objects may be blown around. Strong winds and rough waves on area lakes will create hazardous conditions for small craft.

Winds this strong can make driving difficult, especially for high profile vehicles. Use extra caution. Secure outdoor objects. Boaters on area lakes should use extra caution since strong winds and rough waves can overturn small craft.
Friday, May 15, 2026

Weather Forecast

Sunny
56°F
27.6°F
42.9°F
38%
0 in
0%
0%
15 mph
7.7


Air Quality

AQI: 1 - Good
PM2.5: 2.74 μg/m3
PM10: 5.95 μg/m3
Carbon Monoxide: 120.53 μg/m3
Nitrogen Dioxide: 1.65 μg/m3
Sulphur Dioxide: 1.44 μg/m3
Ozone: 104.84 μg/m3

Astronomical

Sunrise: 5:57 AM
Sun Transit: 1:21 PM
Sunset: 8:48 PM
Daylight: 14 hrs 51 mins
Moonrise: 4:47 AM
Moon Transit: 12:14 AM
Moonset: 8:00 PM
Moon Phase: New
Moon Illumination: 0.1%

Best Times for Fishing or Hunting

Major Periods

9:16 PM - 11:46 PM
11:44 AM - 2:14 PM

Minor Periods

7:30 PM - 9:00 PM
4:17 AM - 5:47 AM

Action Rating: 6 out of 5

Saturday, May 16, 2026

Weather Forecast

Patchy rain nearby
47.1°F
31.5°F
40°F
54%
0.11 in
85%
9%
16.3 mph
6.1


Air Quality

AQI: 1 - Good
PM2.5: 3.52 μg/m3
PM10: 7.81 μg/m3
Carbon Monoxide: 130.77 μg/m3
Nitrogen Dioxide: 2.09 μg/m3
Sulphur Dioxide: 1.31 μg/m3
Ozone: 95.72 μg/m3

Astronomical

Sunrise: 5:55 AM
Sun Transit: 1:21 PM
Sunset: 8:49 PM
Daylight: 14 hrs 54 mins
Moonrise: 5:18 AM
Moon Transit: 1:14 PM
Moonset: 9:26 PM
Moon Phase: New
Moon Illumination: 2.0%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
12:44 AM - 3:14 PM

Minor Periods

8:56 PM - 10:26 PM
4:48 AM - 6:18 AM

Action Rating: 5 out of 5

Sunday, May 17, 2026

Weather Forecast

Moderate or heavy snow showers
36.3°F
24.8°F
30.4°F
83%
0.36 in
83%
45%
12.1 mph
5.3


Air Quality

AQI: 1 - Good
PM2.5: 2.5 μg/m3
PM10: 3.85 μg/m3
Carbon Monoxide: 129.05 μg/m3
Nitrogen Dioxide: 1.14 μg/m3
Sulphur Dioxide: 1.85 μg/m3
Ozone: 101 μg/m3

Astronomical

Sunrise: 5:54 AM
Sun Transit: 1:21 PM
Sunset: 8:50 PM
Daylight: 14 hrs 56 mins
Moonrise: 6:01 AM
Moon Transit: 2:19 PM
Moonset: 10:47 PM
Moon Phase: New
Moon Illumination: 0.2%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
1:49 PM - 4:19 PM

Minor Periods

10:17 PM - 11:47 PM
5:31 AM - 7:01 AM

Action Rating: 4 out of 5

Monday, May 18, 2026

Weather Forecast

Partly Cloudy
44.3°F
19°F
31.4°F
68%
0 in
0%
18%
8.5 mph
8.3


Air Quality

AQI: 1 - Good
PM2.5: 1.86 μg/m3
PM10: 2.17 μg/m3
Carbon Monoxide: 125.98 μg/m3
Nitrogen Dioxide: 1.39 μg/m3
Sulphur Dioxide: 1.21 μg/m3
Ozone: 87.64 μg/m3

Astronomical

Sunrise: 5:53 AM
Sun Transit: 1:21 PM
Sunset: 8:51 PM
Daylight: 14 hrs 58 mins
Moonrise: 6:57 AM
Moon Transit: 3:26 PM
Moonset: 11:55 PM
Moon Phase: New
Moon Illumination: 2.6%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
2:56 PM - 5:26 PM

Minor Periods

12:00 AM - 12:00 AM
6:27 AM - 7:57 AM

Action Rating: 3 out of 5

Tuesday, May 19, 2026

Weather Forecast

Moderate rain
46.2°F
20°F
33.9°F
69%
0.26 in
88%
7%
9.2 mph
0


Air Quality

AQI: 1 - Good
PM2.5: 1.43 μg/m3
PM10: 1.51 μg/m3
Carbon Monoxide: 125.58 μg/m3
Nitrogen Dioxide: 1.91 μg/m3
Sulphur Dioxide: 0.87 μg/m3
Ozone: 87.23 μg/m3

Astronomical

Sunrise: 5:52 AM
Sun Transit: 1:21 PM
Sunset: 8:52 PM
Daylight: 15 hrs mins
Moonrise: 8:07 AM
Moon Transit: 4:32 PM
Moonset: 12:55 AM
Moon Phase: Waxing Crescent
Moon Illumination: 7.4%

Best Times for Fishing or Hunting

Major Periods

12:31 AM - 3:01 AM
4:02 PM - 6:32 PM

Minor Periods

7:37 AM - 9:07 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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