Water Temperature of the Firehole River in Yellowstone National Park, WY

Current Water Temperature

46.8°F

Measurement Time: Monday, October 6, 2025, 7:00 PM MDT

Temperature Locations

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Local Points of Interest

Old Faithful; Alta, WY

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Firehole River

Station Name: Firehole River at Old Faithful, YNP
Data Source: Water Data - usgc.gov

Elevation Above Sea Level: 7,372 feet / 2,247 meters

Nearest Address:
Mallard Lake Trail
Yellowstone National Park, WY 82190
Teton County

GPS Coordinates: 44.4593333, -110.8222722

Nearby Water Temperatures

Firehole River, Yellowstone National Park, WY (11.3 mi)
Gibbon River, Yellowstone National Park, WY (12.7 mi)
Madison River, West Yellowstone, MT (18.2 mi)
Tantalus Creek, Yellowstone National Park, WY (19.6 mi)
Snake River, Flagg Ranch, WY (26.1 mi)
Boiling River Hot Springs, Yellowstone National Park, WY (36.9 mi)
Madison River, Grayling, MT (37.9 mi)
Lamar River, Yellowstone National Park, WY (38.6 mi)
Snake River, Moran, WY (43.1 mi)
Yellowstone River, Corwin Springs, MT (45.1 mi)
Buffalo Fork River, Moran, WY (46.9 mi)
Madison River, Cameron, MT (47.6 mi)
Blackrock Creek, Moran, WY (55.2 mi)
Snake River, Moose, WY (55.9 mi)
Fish Creek, Wilson, WY (66.3 mi)

Weather for Yellowstone National Park, Wyoming

Current Weather

27°F
Clear
Conditions: Clear
Humidity: 100%
Feels Like: 24.1°F
Wind: S 2.7 mph
Wind Gusts: 5.6 mph
Pressure: 30.31 in
Precipitation: 0 in
Cloud Cover: 0%
Visibility: 9 mi
UV Index: 0

Five Day Weather Forecast

Sunny
Tue
H: 49°F
L: 31°F
Sunny
Wed
H: 50°F
L: 37°F
Sunny
Thu
H: 58°F
L: 39°F
Patchy rain nearby
Fri
H: 65°F
L: 42°F
Patchy rain nearby
Sat
H: 47°F
L: 31°F

Air Quality

PM2.5: 2.58 μg/m3
PM10: 3.18 μg/m3
Carbon Monoxide: 126.68 μg/m3
Nitrogen Dioxide: 2.88 μg/m3
Sulphur Dioxide: 0.98 μg/m3
Ozone: 86 μg/m3

Astronomical

Sunrise: 7:29 AM
Sun Transit: 1:10 PM
Sunset: 6:52 PM
Daylight: 11 hrs 24 mins
Moonrise: 6:58 PM
Moon Transit: 1:14 AM
Moonset: 8:11 AM
Moon Phase: Full
Moon Illumination: 99.1%

Best Times for Fishing or Hunting

Major Periods

12:44 AM - 3:14 AM
10:18 AM - 12:48 AM

Minor Periods

6:28 PM - 7:58 PM
7:41 AM - 9:11 AM

Action Rating: 5 out of 5

Freeze Warning issued October 6 at 9:59AM MDT until October 7 at 10:00AM MDT by NWS Pocatello ID

Effective: Mon October 6, 2025, 9:59 AM
Expires: Tue October 7, 2025, 10:00 AM

* WHAT...Sub-freezing temperatures as low as 27 expected. * WHERE...Eastern Magic Valley, Shoshone/Lava Beds, Arco/Mud Lake Desert, Lower Snake River Plain, and Upper Snake River Plain. * WHEN...From midnight tonight to 10 AM MDT Tuesday. * 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, October 7, 2025

Weather Forecast

Conditions: Sunny
Average Temperature: 39.5°F
Average Humidity: 59%
Chance of Rain: 0%
Wind: 9.4 mph
UV Index: 1

Air Quality

AQI: 1 - Good
PM2.5: 2.29 μg/m3
PM10: 2.86 μg/m3
Carbon Monoxide: 126.16 μg/m3
Nitrogen Dioxide: 2.53 μg/m3
Sulphur Dioxide: 0.97 μg/m3
Ozone: 94.56 μg/m3

Astronomical

Sunrise: 7:29 AM
Sun Transit: 1:10 PM
Sunset: 6:52 PM
Daylight: 11 hrs 24 mins
Moonrise: 6:58 PM
Moon Transit: 1:14 AM
Moonset: 8:11 AM
Moon Phase: Full
Moon Illumination: 99.1%

Best Times for Fishing or Hunting

Major Periods

12:44 AM - 3:14 AM
10:18 AM - 12:48 AM

Minor Periods

6:28 PM - 7:58 PM
7:41 AM - 9:11 AM

Action Rating: 5 out of 5

Wednesday, October 8, 2025

Weather Forecast

Conditions: Sunny
Average Temperature: 43.1°F
Average Humidity: 51%
Chance of Rain: 0%
Wind: 13 mph
UV Index: 1

Air Quality

AQI: 1 - Good
PM2.5: 2.84 μg/m3
PM10: 3.95 μg/m3
Carbon Monoxide: 127.92 μg/m3
Nitrogen Dioxide: 2.03 μg/m3
Sulphur Dioxide: 0.96 μg/m3
Ozone: 105.48 μg/m3

Astronomical

Sunrise: 7:30 AM
Sun Transit: 1:10 PM
Sunset: 6:51 PM
Daylight: 11 hrs 21 mins
Moonrise: 7:25 PM
Moon Transit: 2:07 AM
Moonset: 9:35 AM
Moon Phase: Full
Moon Illumination: 95.8%

Best Times for Fishing or Hunting

Major Periods

1:37 AM - 4:07 AM
11:12 AM - 1:42 PM

Minor Periods

6:55 PM - 8:25 PM
9:05 AM - 10:35 AM

Action Rating: 4 out of 5

Thursday, October 9, 2025

Weather Forecast

Conditions: Sunny
Average Temperature: 48.4°F
Average Humidity: 40%
Chance of Rain: 0%
Wind: 11.4 mph
UV Index: 1

Air Quality

AQI: 1 - Good
PM2.5: 3.17 μg/m3
PM10: 4.65 μg/m3
Carbon Monoxide: 118.72 μg/m3
Nitrogen Dioxide: 2 μg/m3
Sulphur Dioxide: 1.03 μg/m3
Ozone: 103.96 μg/m3

Astronomical

Sunrise: 7:31 AM
Sun Transit: 1:10 PM
Sunset: 6:49 PM
Daylight: 11 hrs 18 mins
Moonrise: 8:00 PM
Moon Transit: 3:04 AM
Moonset: 11:01 AM
Moon Phase: Waning Gibbous
Moon Illumination: 90.1%

Best Times for Fishing or Hunting

Major Periods

2:34 AM - 5:04 AM
12:11 AM - 2:41 PM

Minor Periods

7:30 PM - 9:00 PM
10:31 AM - 12:01 AM

Action Rating: 2 out of 5

Friday, October 10, 2025

Weather Forecast

Conditions: Patchy rain nearby
Average Temperature: 50.8°F
Average Humidity: 52%
Chance of Rain: 82%
Wind: 14.3 mph
UV Index: 1

Air Quality

AQI: 1 - Good
PM2.5: 2.52 μg/m3
PM10: 3.41 μg/m3
Carbon Monoxide: 116.37 μg/m3
Nitrogen Dioxide: 3.09 μg/m3
Sulphur Dioxide: 1.05 μg/m3
Ozone: 98.54 μg/m3

Astronomical

Sunrise: 7:32 AM
Sun Transit: 1:10 PM
Sunset: 6:47 PM
Daylight: 11 hrs 15 mins
Moonrise: 8:46 PM
Moon Transit: 4:05 AM
Moonset: 12:24 AM
Moon Phase: Waning Gibbous
Moon Illumination: 82.3%

Best Times for Fishing or Hunting

Major Periods

3:35 AM - 6:05 AM
1:13 PM - 3:43 PM

Minor Periods

8:16 PM - 9:46 PM
11:54 AM - 1:24 PM

Action Rating: 2 out of 5

Saturday, October 11, 2025

Weather Forecast

Conditions: Patchy rain nearby
Average Temperature: 43.1°F
Average Humidity: 79%
Chance of Rain: 87%
Wind: 18.1 mph
UV Index: 0

Air Quality

AQI: 0 -
PM2.5: 0 μg/m3
PM10: 0 μg/m3
Carbon Monoxide: 0 μg/m3
Nitrogen Dioxide: 0 μg/m3
Sulphur Dioxide: 0 μg/m3
Ozone: 0 μg/m3

Astronomical

Sunrise: 7:34 AM
Sun Transit: 1:09 PM
Sunset: 6:45 PM
Daylight: 11 hrs 12 mins
Moonrise: 9:43 PM
Moon Transit: 5:09 AM
Moonset: 1:38 PM
Moon Phase: Waning Gibbous
Moon Illumination: 72.9%

Best Times for Fishing or Hunting

Major Periods

4:39 AM - 7:09 AM
2:17 PM - 4:47 PM

Minor Periods

9:13 PM - 10:43 PM
1:08 PM - 2:38 PM

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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