Water Temperature of the Madison River in Grayling, MT

Current Water Temperature

48.9°F

Measurement Time: Saturday, May 16, 2026, 4:45 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

48.4°F
Overcast
Overcast
44.1°F
43.6°F
27%
S 9.6 mph
11.1 mph
38.8°F
23.5°F
0 in
100%
9 mi
1013 mbar
1.8

Five Day Weather Forecast

Patchy rain nearby
Sat
H: 50°F
L: 29°F
Patchy rain nearby
Sun
H: 42°F
L: 27°F
Patchy rain nearby
Mon
H: 46°F
L: 23°F
Patchy rain nearby
Tue
H: 51°F
L: 22°F
Patchy rain nearby
Wed
H: 51°F
L: 30°F

Air Quality

AQI: 1 - Good
PM2.5: 5.05 μg/m3
PM10: 13.35 μg/m3
Carbon Monoxide: 129.85 μg/m3
Nitrogen Dioxide: 1.15 μg/m3
Sulphur Dioxide: 1.35 μg/m3
Ozone: 106 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

Winter Weather Advisory issued May 15 at 11:00PM MDT until May 17 at 6:00AM MDT by NWS Great Falls MT

Effective: Fri May 15, 2026, 11:00 PM
Expires: Sat May 16, 2026, 2:00 PM

* WHAT...Snow expected. Total snow accumulations 3 to 7 inches, with higher amounts on high peaks. Winds gusting as high as 40 mph. * WHERE...Gallatin and Madison County Mountains and Centennial Mountains. * WHEN...From 5 PM Saturday to 6 AM MDT Sunday. * IMPACTS...Plan on slippery and slushy road conditions and raw back country conditions Saturday evening into Sunday. * ADDITIONAL DETAILS...Snow levels quickly fall Saturday evening after a round of showers and perhaps a couple thunderstorms Saturday afternoon. Those with back country plans should be aware of the forecast raw conditions.

Slow down and use caution while traveling. The latest road conditions can be obtained by calling 5 1 1 or visiting the MDT Road Report website. To see a graphical representation of the degree of stress on young livestock please visit our webpage and select Local Programs then Cold Air Advisory for Newborn Livestock.


Wind Advisory issued May 15 at 10:04PM MDT until May 16 at 10:00PM MDT by NWS Pocatello ID

Effective: Fri May 15, 2026, 10:04 PM
Expires: Sat May 16, 2026, 2:00 PM

* WHAT...West winds 25 to 35 mph with gusts up to 50 mph expected. * WHERE...Eastern Magic Valley, Shoshone/Lava Beds, Arco/Mud Lake Desert, Lower Snake River Plain, and Upper Snake River Plain. * WHEN...From noon to 10 PM MDT Saturday. * 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. Blowing dust with reduced visibility is also possible.

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 16 at 1:08AM MDT until May 16 at 10:00PM MDT by NWS Pocatello ID

Effective: Sat May 16, 2026, 1:08 AM
Expires: Sat May 16, 2026, 4:15 PM

* WHAT...For the Wind Advisory, west winds 25 to 35 mph with gusts up to 50 mph expected. For the Freeze Watch, sub-freezing temperatures 27 to 32 degrees. A hard freeze is likely for portions of the Watch area. * WHERE...Eastern Magic Valley, Shoshone/Lava Beds, Arco/Mud Lake Desert, Lower Snake River Plain, and Upper Snake River Plain. * WHEN...For the Wind Advisory, from noon today to 10 PM MDT this evening. For the Freeze Watch, from late tonight through Sunday morning. * 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. Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing.

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. Take steps now to protect tender plants from the cold.


Freeze Watch issued May 16 at 1:08AM MDT until May 17 at 9:00AM MDT by NWS Pocatello ID

Effective: Sat May 16, 2026, 1:08 AM
Expires: Sat May 16, 2026, 4:15 PM

* WHAT...For the Wind Advisory, west winds 25 to 35 mph with gusts up to 50 mph expected. For the Freeze Watch, sub-freezing temperatures 27 to 32 degrees. A hard freeze is likely for portions of the Watch area. * WHERE...Eastern Magic Valley, Shoshone/Lava Beds, Arco/Mud Lake Desert, Lower Snake River Plain, and Upper Snake River Plain. * WHEN...For the Wind Advisory, from noon today to 10 PM MDT this evening. For the Freeze Watch, from late tonight through Sunday morning. * 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. Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing.

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. Take steps now to protect tender plants from the cold.


Saturday, May 16, 2026

Weather Forecast

Patchy rain nearby
50.1°F
28.7°F
39.8°F
52%
0.09 in
93%
9%
19.7 mph
4.3


Air Quality

AQI: 1 - Good
PM2.5: 4.24 μg/m3
PM10: 10.36 μg/m3
Carbon Monoxide: 130.05 μg/m3
Nitrogen Dioxide: 2.08 μg/m3
Sulphur Dioxide: 1.24 μg/m3
Ozone: 95.6 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

Patchy rain nearby
42.1°F
26.7°F
34.2°F
64%
0.02 in
89%
29%
12.1 mph
5.6


Air Quality

AQI: 1 - Good
PM2.5: 2.6 μg/m3
PM10: 4.72 μg/m3
Carbon Monoxide: 130.17 μg/m3
Nitrogen Dioxide: 1.19 μg/m3
Sulphur Dioxide: 1.75 μg/m3
Ozone: 100.4 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

Patchy rain nearby
45.9°F
23.4°F
34.7°F
56%
0.01 in
85%
27%
9.8 mph
7.9


Air Quality

AQI: 1 - Good
PM2.5: 1.52 μg/m3
PM10: 1.69 μg/m3
Carbon Monoxide: 122.97 μg/m3
Nitrogen Dioxide: 1.33 μg/m3
Sulphur Dioxide: 1.03 μg/m3
Ozone: 84.04 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

Patchy rain nearby
50.6°F
21.8°F
36.8°F
54%
0.06 in
84%
3%
12.1 mph
5.5


Air Quality

AQI: 1 - Good
PM2.5: 3.02 μg/m3
PM10: 3.67 μg/m3
Carbon Monoxide: 118.97 μg/m3
Nitrogen Dioxide: 1.38 μg/m3
Sulphur Dioxide: 0.94 μg/m3
Ozone: 100.48 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

Wednesday, May 20, 2026

Weather Forecast

Patchy rain nearby
50.8°F
30.2°F
40.4°F
74%
0.14 in
89%
14%
8.7 mph
0


Air Quality

AQI: 1 - Good
PM2.5: 3.01 μg/m3
PM10: 3.48 μg/m3
Carbon Monoxide: 129.39 μg/m3
Nitrogen Dioxide: 2.81 μg/m3
Sulphur Dioxide: 1.09 μg/m3
Ozone: 90.92 μg/m3

Astronomical

Sunrise: 5:51 AM
Sun Transit: 1:21 PM
Sunset: 8:53 PM
Daylight: 15 hrs 2 mins
Moonrise: 9:26 AM
Moon Transit: 5:33 PM
Moonset: 12:48 AM
Moon Phase: Waxing Crescent
Moon Illumination: 14.4%

Best Times for Fishing or Hunting

Major Periods

1:35 AM - 4:05 AM
5:03 PM - 7:33 PM

Minor Periods

8:56 AM - 10:26 AM
12:18 AM - 1:48 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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