Water Temperature of the Madison River in Grayling, MT

Current Water Temperature

45.3°F

Measurement Time: Tuesday, May 19, 2026, 5:45 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

47.3°F
Sunny
Sunny
43.2°F
47.3°F
28%
SW 9.6 mph
11.1 mph
43.2°F
16.7°F
0 in
6%
6 mi
1016 mbar
6.3

Five Day Weather Forecast

Patchy rain nearby
Tue
H: 51°F
L: 20°F
Moderate rain
Wed
H: 51°F
L: 26°F
Moderate rain
Thu
H: 43°F
L: 29°F
Sunny
Fri
H: 57°F
L: 21°F
Patchy rain nearby
Sat
H: 59°F
L: 30°F

Air Quality

AQI: 1 - Good
PM2.5: 3.25 μg/m3
PM10: 4.25 μg/m3
Carbon Monoxide: 120.85 μg/m3
Nitrogen Dioxide: 1.05 μg/m3
Sulphur Dioxide: 1.05 μg/m3
Ozone: 102 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

Freeze Warning issued May 19 at 1:44AM MDT until May 19 at 9:00AM MDT by NWS Pocatello ID

Effective: Tue May 19, 2026, 1:44 AM
Expires: Tue May 19, 2026, 9:00 AM

* WHAT...Sub-freezing temperatures as low as 25 degrees. More populated areas will be around to 28 to 32 degrees. * WHERE...Arco/Mud Lake Desert, Lower Snake River Plain, and Upper Snake River Plain. * WHEN...Until 9 AM MDT this morning. * IMPACTS...Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing.

Take steps now to protect tender plants from the cold.
Tuesday, May 19, 2026

Weather Forecast

Patchy rain nearby
50.7°F
20°F
35.9°F
48%
0.02 in
83%
9%
11.6 mph
6.5


Air Quality

AQI: 1 - Good
PM2.5: 3.99 μg/m3
PM10: 4.97 μg/m3
Carbon Monoxide: 120.09 μg/m3
Nitrogen Dioxide: 1.99 μg/m3
Sulphur Dioxide: 1.05 μg/m3
Ozone: 90.32 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

Moderate rain
50.9°F
25.8°F
39.1°F
71%
0.27 in
85%
16%
8.3 mph
6.7


Air Quality

AQI: 1 - Good
PM2.5: 4.05 μg/m3
PM10: 6.08 μg/m3
Carbon Monoxide: 117.73 μg/m3
Nitrogen Dioxide: 1.92 μg/m3
Sulphur Dioxide: 1.1 μg/m3
Ozone: 95.84 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

Thursday, May 21, 2026

Weather Forecast

Moderate rain
42.6°F
29.2°F
37.5°F
90%
0.26 in
88%
0%
7.6 mph
0


Air Quality

AQI: 1 - Good
PM2.5: 1.81 μg/m3
PM10: 2.46 μg/m3
Carbon Monoxide: 119.42 μg/m3
Nitrogen Dioxide: 1.79 μg/m3
Sulphur Dioxide: 0.95 μg/m3
Ozone: 90.2 μg/m3

Astronomical

Sunrise: 5:50 AM
Sun Transit: 1:22 PM
Sunset: 8:54 PM
Daylight: 15 hrs 4 mins
Moonrise: 10:47 AM
Moon Transit: 6:29 PM
Moonset: 1:27 AM
Moon Phase: Waxing Crescent
Moon Illumination: 23.2%

Best Times for Fishing or Hunting

Major Periods

2:35 AM - 5:05 AM
5:59 PM - 8:29 PM

Minor Periods

10:17 AM - 11:47 AM
12:57 AM - 2:27 AM

Action Rating: 3 out of 5

Friday, May 22, 2026

Weather Forecast

Sunny
56.6°F
20.8°F
40.1°F
64%
0 in
0%
0%
6.7 mph
2


Air Quality

AQI: 1 - Good
PM2.5: 1.59 μg/m3
PM10: 1.93 μg/m3
Carbon Monoxide: 127.15 μg/m3
Nitrogen Dioxide: 1.57 μg/m3
Sulphur Dioxide: 0.96 μg/m3
Ozone: 103.48 μg/m3

Astronomical

Sunrise: 5:49 AM
Sun Transit: 1:22 PM
Sunset: 8:55 PM
Daylight: 15 hrs 6 mins
Moonrise: 12:05 AM
Moon Transit: 7:19 PM
Moonset: 1:56 AM
Moon Phase: Waxing Crescent
Moon Illumination: 33.4%

Best Times for Fishing or Hunting

Major Periods

3:28 AM - 5:58 AM
6:49 PM - 9:19 PM

Minor Periods

11:35 AM - 1:05 PM
1:26 AM - 2:56 AM

Action Rating: 4 out of 5

Saturday, May 23, 2026

Weather Forecast

Patchy rain nearby
59.2°F
29.8°F
42.9°F
68%
0.1 in
77%
0%
8.9 mph
2


Air Quality

AQI: 1 - Good
PM2.5: 2.23 μg/m3
PM10: 3.27 μg/m3
Carbon Monoxide: 121.77 μg/m3
Nitrogen Dioxide: 2.25 μg/m3
Sulphur Dioxide: 1 μg/m3
Ozone: 97.62 μg/m3

Astronomical

Sunrise: 5:49 AM
Sun Transit: 1:22 PM
Sunset: 8:56 PM
Daylight: 15 hrs 8 mins
Moonrise: 1:19 PM
Moon Transit: 8:05 PM
Moonset: 2:20 AM
Moon Phase: First Quarter
Moon Illumination: 44.4%

Best Times for Fishing or Hunting

Major Periods

4:17 AM - 6:47 AM
7:35 PM - 10:05 PM

Minor Periods

12:49 AM - 2:19 PM
1:50 AM - 3:20 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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