Water Temperature of the Madison River in Grayling, MT

Current Water Temperature

40.1°F

Measurement Time: Friday, April 17, 2026, 11:45 PM 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

1.6°F
Partly cloudy
Partly cloudy
-3.2°F
6.4°F
92%
WSW 2.2 mph
2.3 mph
6.4°F
4°F
0 in
75%
9 mi
1023 mbar
0

Five Day Weather Forecast

Sunny
Sat
H: 40°F
L: 6°F
Sunny
Sun
H: 50°F
L: 15°F
Sunny
Mon
H: 58°F
L: 25°F
Sunny
Tue
H: 62°F
L: 28°F
Patchy rain nearby
Wed
H: 48°F
L: 29°F

Air Quality

AQI: 1 - Good
PM2.5: 5.05 μg/m3
PM10: 7.35 μg/m3
Carbon Monoxide: 144.85 μg/m3
Nitrogen Dioxide: 1.25 μg/m3
Sulphur Dioxide: 1.05 μg/m3
Ozone: 126 μg/m3

Astronomical

Sunrise: 6:36 AM
Sun Transit: 1:24 PM
Sunset: 8:15 PM
Daylight: 13 hrs 39 mins
Moonrise: 6:50 AM
Moon Transit: 2:32 PM
Moonset: 10:32 PM
Moon Phase: New
Moon Illumination: 1.2%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
2:02 PM - 4:32 PM

Minor Periods

10:02 PM - 11:32 PM
6:20 AM - 7:50 AM

Action Rating: 4 out of 5

Freeze Warning issued April 17 at 1:16PM MDT until April 18 at 10:00AM MDT by NWS Pocatello ID

Effective: Fri April 17, 2026, 1:16 PM
Expires: Sat April 18, 2026, 4:00 AM

* WHAT...Lows tonight will drop to between 22 and 26 degrees, which would be a Hard Freeze. Lows for Sunday morning will range 28 to 32 degrees. A Hard Freeze is not expected for most areas. * WHERE...Arco/Mud Lake Desert, Lower Snake River Plain, and Upper Snake River Plain. * WHEN...For the first Freeze Warning, from midnight tonight to 10 AM MDT Saturday. For the second Freeze Warning, from midnight Saturday Night to 10 AM MDT Sunday. * 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.


Freeze Warning issued April 17 at 1:16PM MDT until April 19 at 10:00AM MDT by NWS Pocatello ID

Effective: Fri April 17, 2026, 1:16 PM
Expires: Sat April 18, 2026, 4:00 AM

* WHAT...Lows tonight will drop to between 22 and 26 degrees, which would be a Hard Freeze. Lows for Sunday morning will range 28 to 32 degrees. A Hard Freeze is not expected for most areas. * WHERE...Arco/Mud Lake Desert, Lower Snake River Plain, and Upper Snake River Plain. * WHEN...For the first Freeze Warning, from midnight tonight to 10 AM MDT Saturday. For the second Freeze Warning, from midnight Saturday Night to 10 AM MDT Sunday. * 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.
Saturday, April 18, 2026

Weather Forecast

Sunny
40.3°F
5.9°F
22.9°F
74%
0 in
0%
0%
7.2 mph
2


Air Quality

AQI: 1 - Good
PM2.5: 5.15 μg/m3
PM10: 6.86 μg/m3
Carbon Monoxide: 144.29 μg/m3
Nitrogen Dioxide: 2.66 μg/m3
Sulphur Dioxide: 0.97 μg/m3
Ozone: 112.48 μg/m3

Astronomical

Sunrise: 6:36 AM
Sun Transit: 1:24 PM
Sunset: 8:15 PM
Daylight: 13 hrs 39 mins
Moonrise: 6:50 AM
Moon Transit: 2:32 PM
Moonset: 10:32 PM
Moon Phase: New
Moon Illumination: 1.2%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
2:02 PM - 4:32 PM

Minor Periods

10:02 PM - 11:32 PM
6:20 AM - 7:50 AM

Action Rating: 4 out of 5

Sunday, April 19, 2026

Weather Forecast

Sunny
50°F
15.1°F
31.6°F
66%
0 in
0%
0%
5.4 mph
2.1


Air Quality

AQI: 1 - Good
PM2.5: 5.38 μg/m3
PM10: 9.9 μg/m3
Carbon Monoxide: 140.41 μg/m3
Nitrogen Dioxide: 2.4 μg/m3
Sulphur Dioxide: 1.07 μg/m3
Ozone: 131.48 μg/m3

Astronomical

Sunrise: 6:34 AM
Sun Transit: 1:24 PM
Sunset: 8:16 PM
Daylight: 13 hrs 42 mins
Moonrise: 7:25 AM
Moon Transit: 3:33 PM
Moonset: 11:55 PM
Moon Phase: Waxing Crescent
Moon Illumination: 4.9%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
3:03 PM - 5:33 PM

Minor Periods

12:00 AM - 12:00 AM
6:55 AM - 8:25 AM

Action Rating: 3 out of 5

Monday, April 20, 2026

Weather Forecast

Sunny
57.5°F
25°F
40°F
58%
0 in
0%
0%
8.3 mph
1.9


Air Quality

AQI: 1 - Good
PM2.5: 5.17 μg/m3
PM10: 15.69 μg/m3
Carbon Monoxide: 134.65 μg/m3
Nitrogen Dioxide: 2.75 μg/m3
Sulphur Dioxide: 1.11 μg/m3
Ozone: 133.44 μg/m3

Astronomical

Sunrise: 6:32 AM
Sun Transit: 1:24 PM
Sunset: 8:17 PM
Daylight: 13 hrs 45 mins
Moonrise: 8:13 AM
Moon Transit: 4:38 PM
Moonset: 12:55 AM
Moon Phase: Waxing Crescent
Moon Illumination: 10.8%

Best Times for Fishing or Hunting

Major Periods

12:37 AM - 3:07 AM
4:08 PM - 6:38 PM

Minor Periods

7:43 AM - 9:13 AM
12:00 AM - 12:00 AM

Action Rating: 2 out of 5

Tuesday, April 21, 2026

Weather Forecast

Sunny
61.5°F
28.2°F
43.8°F
52%
0 in
0%
0%
11.9 mph
2


Air Quality

AQI: 1 - Good
PM2.5: 6.59 μg/m3
PM10: 18.51 μg/m3
Carbon Monoxide: 139.62 μg/m3
Nitrogen Dioxide: 3.49 μg/m3
Sulphur Dioxide: 1.19 μg/m3
Ozone: 132 μg/m3

Astronomical

Sunrise: 6:31 AM
Sun Transit: 1:24 PM
Sunset: 8:19 PM
Daylight: 13 hrs 48 mins
Moonrise: 9:13 AM
Moon Transit: 5:43 PM
Moonset: 1:08 AM
Moon Phase: Waxing Crescent
Moon Illumination: 18.8%

Best Times for Fishing or Hunting

Major Periods

1:42 AM - 4:12 AM
5:13 PM - 7:43 PM

Minor Periods

8:43 AM - 10:13 AM
12:38 AM - 2:08 AM

Action Rating: 2 out of 5

Wednesday, April 22, 2026

Weather Forecast

Patchy rain nearby
48.4°F
29.2°F
37.5°F
69%
0.03 in
88%
0%
21.3 mph
0


Air Quality

AQI: 1 - Good
PM2.5: 7.21 μg/m3
PM10: 20.93 μg/m3
Carbon Monoxide: 151.39 μg/m3
Nitrogen Dioxide: 4.01 μg/m3
Sulphur Dioxide: 1.19 μg/m3
Ozone: 125.69 μg/m3

Astronomical

Sunrise: 6:29 AM
Sun Transit: 1:23 PM
Sunset: 8:20 PM
Daylight: 13 hrs 51 mins
Moonrise: 10:26 AM
Moon Transit: 6:45 PM
Moonset: 2:08 AM
Moon Phase: Waxing Crescent
Moon Illumination: 28.4%

Best Times for Fishing or Hunting

Major Periods

2:46 AM - 5:16 AM
6:15 PM - 8:45 PM

Minor Periods

9:56 AM - 11:26 AM
1:38 AM - 3:08 AM

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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