Water Temperature of the Madison River in Grayling, MT

Current Water Temperature

41.9°F

Measurement Time: Saturday, May 2, 2026, 12:45 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

25°F
Sunny
Sunny
22.7°F
32.7°F
100%
SE 2.2 mph
4.2 mph
31.7°F
20.2°F
0 in
0%
9 mi
1024 mbar
0.1

Five Day Weather Forecast

Sunny
Sat
H: 56°F
L: 26°F
Patchy rain nearby
Sun
H: 59°F
L: 32°F
Sunny
Mon
H: 60°F
L: 32°F
Patchy rain nearby
Tue
H: 57°F
L: 25°F
Sunny
Wed
H: 62°F
L: 23°F

Air Quality

AQI: 1 - Good
PM2.5: 4.15 μg/m3
PM10: 7.85 μg/m3
Carbon Monoxide: 126.85 μg/m3
Nitrogen Dioxide: 0.95 μg/m3
Sulphur Dioxide: 1.05 μg/m3
Ozone: 147 μg/m3

Astronomical

Sunrise: 6:13 AM
Sun Transit: 1:22 PM
Sunset: 8:32 PM
Daylight: 14 hrs 19 mins
Moonrise: 10:13 PM
Moon Transit: 1:43 AM
Moonset: 6:13 AM
Moon Phase: Full
Moon Illumination: 98.4%

Best Times for Fishing or Hunting

Major Periods

1:13 AM - 3:43 AM
10:40 AM - 1:10 PM

Minor Periods

9:43 PM - 11:13 PM
5:43 AM - 7:13 AM

Action Rating: 3 out of 5

Frost Advisory issued May 1 at 5:04PM MDT until May 2 at 9:00AM MDT by NWS Pocatello ID

Effective: Fri May 1, 2026, 5:04 PM
Expires: Sat May 2, 2026, 9:00 AM

* WHAT...Temperatures as low as 29 will result in frost formation. * WHERE...Eastern Magic Valley, Shoshone/Lava Beds, Arco/Mud Lake Desert, Lower Snake River Plain, and Upper Snake River Plain. * WHEN...From 3 AM to 9 AM MDT Saturday. * 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.


Frost Advisory issued May 2 at 3:13AM MDT until May 2 at 9:00AM MDT by NWS Pocatello ID

Effective: Sat May 2, 2026, 3:13 AM
Expires: Sat May 2, 2026, 9:00 AM

* WHAT...Temperatures 32 to 36 will result in frost formation. * WHERE...Eastern Magic Valley, Shoshone/Lava Beds, Arco/Mud Lake Desert, Lower Snake River Plain, and Upper Snake River Plain. * WHEN...Until 9 AM MDT this morning. * 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.
Saturday, May 2, 2026

Weather Forecast

Sunny
56.1°F
26.1°F
41.4°F
53%
0 in
0%
0%
7.4 mph
7.4


Air Quality

AQI: 1 - Good
PM2.5: 5.19 μg/m3
PM10: 9.5 μg/m3
Carbon Monoxide: 130.37 μg/m3
Nitrogen Dioxide: 3.16 μg/m3
Sulphur Dioxide: 1.07 μg/m3
Ozone: 128.68 μg/m3

Astronomical

Sunrise: 6:13 AM
Sun Transit: 1:22 PM
Sunset: 8:32 PM
Daylight: 14 hrs 19 mins
Moonrise: 10:13 PM
Moon Transit: 1:43 AM
Moonset: 6:13 AM
Moon Phase: Full
Moon Illumination: 98.4%

Best Times for Fishing or Hunting

Major Periods

1:13 AM - 3:43 AM
10:40 AM - 1:10 PM

Minor Periods

9:43 PM - 11:13 PM
5:43 AM - 7:13 AM

Action Rating: 3 out of 5

Sunday, May 3, 2026

Weather Forecast

Patchy rain nearby
59.1°F
31.5°F
45.5°F
50%
0.03 in
69%
0%
6 mph
6.5


Air Quality

AQI: 1 - Good
PM2.5: 4.9 μg/m3
PM10: 7.99 μg/m3
Carbon Monoxide: 124.25 μg/m3
Nitrogen Dioxide: 2.94 μg/m3
Sulphur Dioxide: 1.05 μg/m3
Ozone: 121.12 μg/m3

Astronomical

Sunrise: 6:12 AM
Sun Transit: 1:22 PM
Sunset: 8:34 PM
Daylight: 14 hrs 22 mins
Moonrise: 11:16 PM
Moon Transit: 2:31 AM
Moonset: 6:44 AM
Moon Phase: Full
Moon Illumination: 94.4%

Best Times for Fishing or Hunting

Major Periods

2:01 AM - 4:31 AM
11:30 AM - 2:00 PM

Minor Periods

12:00 AM - 12:00 AM
6:14 AM - 7:44 AM

Action Rating: 4 out of 5

Monday, May 4, 2026

Weather Forecast

Sunny
60.1°F
31.6°F
45.3°F
62%
0 in
0%
0%
10.7 mph
6.5


Air Quality

AQI: 1 - Good
PM2.5: 4.06 μg/m3
PM10: 6.38 μg/m3
Carbon Monoxide: 126.53 μg/m3
Nitrogen Dioxide: 2.97 μg/m3
Sulphur Dioxide: 1.1 μg/m3
Ozone: 117.92 μg/m3

Astronomical

Sunrise: 6:11 AM
Sun Transit: 1:22 PM
Sunset: 8:35 PM
Daylight: 14 hrs 24 mins
Moonrise: 12:16 AM
Moon Transit: 3:21 AM
Moonset: 7:23 AM
Moon Phase: Waning Gibbous
Moon Illumination: 88.0%

Best Times for Fishing or Hunting

Major Periods

2:51 AM - 5:21 AM
12:19 AM - 2:49 PM

Minor Periods

6:53 AM - 8:23 AM
12:00 AM - 12:00 AM

Action Rating: 2 out of 5

Tuesday, May 5, 2026

Weather Forecast

Patchy rain nearby
57°F
25.2°F
41.4°F
64%
0.02 in
73%
0%
11.6 mph
5.7


Air Quality

AQI: 1 - Good
PM2.5: 3.18 μg/m3
PM10: 4.71 μg/m3
Carbon Monoxide: 132.45 μg/m3
Nitrogen Dioxide: 1.65 μg/m3
Sulphur Dioxide: 0.96 μg/m3
Ozone: 101.84 μg/m3

Astronomical

Sunrise: 6:09 AM
Sun Transit: 1:22 PM
Sunset: 8:36 PM
Daylight: 14 hrs 27 mins
Moonrise: 12:14 AM
Moon Transit: 4:12 AM
Moonset: 8:11 AM
Moon Phase: Waning Gibbous
Moon Illumination: 79.8%

Best Times for Fishing or Hunting

Major Periods

3:42 AM - 6:12 AM
1:11 PM - 3:41 PM

Minor Periods

7:41 AM - 9:11 AM
12:00 AM - 12:00 AM

Action Rating: 3 out of 5

Wednesday, May 6, 2026

Weather Forecast

Sunny
62°F
23.4°F
39.8°F
59%
0 in
0%
0%
10.3 mph
0


Air Quality

AQI: 1 - Good
PM2.5: 2.34 μg/m3
PM10: 2.59 μg/m3
Carbon Monoxide: 137.68 μg/m3
Nitrogen Dioxide: 1.78 μg/m3
Sulphur Dioxide: 0.99 μg/m3
Ozone: 106.23 μg/m3

Astronomical

Sunrise: 6:08 AM
Sun Transit: 1:21 PM
Sunset: 8:37 PM
Daylight: 14 hrs 30 mins
Moonrise: 1:02 AM
Moon Transit: 5:03 AM
Moonset: 9:08 AM
Moon Phase: Waning Gibbous
Moon Illumination: 70.0%

Best Times for Fishing or Hunting

Major Periods

4:33 AM - 7:03 AM
2:02 PM - 4:32 PM

Minor Periods

8:38 AM - 10:08 AM
12:32 AM - 2:02 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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