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

Current Water Temperature

42.6°F 5.9°C
Frigid Dangerously Cold
42.6°F
Frigid < 50°F
Cold 50°–60°
Cool 60°–70°
Comfortable 70°–80°
Warm 80°+

Severe hypothermia and cold water shock risk. Unprotected swimming causes rapid loss of dexterity in under 5 minutes.

Measurement Time: Wednesday, November 11, 2026, 9:00 PM MST

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

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

29.7°F
Overcast
Conditions: Overcast
Humidity: 50%
Feels Like: 20.7°F
Wind: SE 7.1 mph
Wind Gusts: 7.8 mph
Pressure: 30.06 in
Precipitation: 0 in
Cloud Cover: 100%
Visibility: 22 mi
UV Index: 0

Five-Day Weather Forecast

Overcast
Thu
H: 54°F
L: 28°F
Overcast
Fri
H: 49°F
L: 32°F
Light Snow
Sat
H: 39°F
L: 28°F
Light Snow
Sun
H: 36°F
L: 26°F
Overcast
Mon
H: 42°F
L: 26°F

Air Quality

EPA Index 1 • Good

Air quality is satisfactory, and air pollution poses little or no risk.

PM2.5
0.4 μg/m³
Good
PM10
0.5 μg/m³
Good
Ozone (O3)
77 μg/m³
Photochemical
NO2
0.5 μg/m³
Nitrogen Dioxide
SO2
0.2 μg/m³
Sulfur Dioxide
CO
115 μg/m³
Carbon Monoxide

Astronomical

Sun
9h 43m daylight
Sunrise 7:16 AM
Solar Noon 12:07 PM
Sunset 4:59 PM
Moon
Waxing Crescent • 6%
Moonrise 10:55 AM
Transit 2:58 PM
Moonset 7:04 PM

Best Times for Fishing or Hunting

Major Periods

2:02 AM - 4:32 AM
2:28 PM - 4:58 PM

Minor Periods

10:25 AM - 11:55 AM
6:34 PM - 8:04 PM
Action Rating:
Good Action 3/5
Thursday, November 12, 2026

Weather Forecast

Conditions: Overcast
Average Temperature: 37.9°F
Average Humidity: 40%
Chance of Rain: 0%
Wind: 7.3 mph
UV Index: 3

Air Quality

EPA Index 1 • Good
PM2.5
0.3 μg/m³
Good
PM10
0.4 μg/m³
Good
Ozone (O3)
81.5 μg/m³
Photochemical
NO2
0.7 μg/m³
Nitrogen Dioxide
SO2
0.3 μg/m³
Sulfur Dioxide
CO
118.3 μg/m³
Carbon Monoxide

Astronomical

Sun
9h 43m daylight
Sunrise 7:16 AM
Solar Noon 12:07 PM
Sunset 4:59 PM
Moon
Waxing Crescent • 6%
Moonrise 10:55 AM
Transit 2:58 PM
Moonset 7:04 PM

Best Times for Fishing or Hunting

Major Periods

2:02 AM - 4:32 AM
2:28 PM - 4:58 PM

Minor Periods

10:25 AM - 11:55 AM
6:34 PM - 8:04 PM
Action Rating:
Good Action 3/5
Friday, November 13, 2026

Weather Forecast

Conditions: Overcast
Average Temperature: 38.5°F
Average Humidity: 45%
Chance of Rain: 4%
Wind: 13.4 mph
UV Index: 2.7

Air Quality

EPA Index 1 • Good
PM2.5
0.5 μg/m³
Good
PM10
0.6 μg/m³
Good
Ozone (O3)
93.3 μg/m³
Photochemical
NO2
0.8 μg/m³
Nitrogen Dioxide
SO2
0.4 μg/m³
Sulfur Dioxide
CO
120.6 μg/m³
Carbon Monoxide

Astronomical

Sun
9h 41m daylight
Sunrise 7:17 AM
Solar Noon 12:07 PM
Sunset 4:58 PM
Moon
Waxing Crescent • 13%
Moonrise 11:39 AM
Transit 3:48 PM
Moonset 8:03 PM

Best Times for Fishing or Hunting

Major Periods

2:53 AM - 5:23 AM
3:18 PM - 5:48 PM

Minor Periods

11:09 AM - 12:39 PM
7:33 PM - 9:03 PM
Action Rating:
Fair Action 2/5
Saturday, November 14, 2026

Weather Forecast

Conditions: Light Snow
Average Temperature: 32.9°F
Average Humidity: 81%
Chance of Rain: 41%
Wind: 14.5 mph
UV Index: 1.6

Air Quality

EPA Index 1 • Good
PM2.5
1.1 μg/m³
Good
PM10
1.4 μg/m³
Good
Ozone (O3)
86.1 μg/m³
Photochemical
NO2
0.9 μg/m³
Nitrogen Dioxide
SO2
0.3 μg/m³
Sulfur Dioxide
CO
119.8 μg/m³
Carbon Monoxide

Astronomical

Sun
9h 39m daylight
Sunrise 7:18 AM
Solar Noon 12:07 PM
Sunset 4:57 PM
Moon
Waxing Crescent • 21%
Moonrise 12:14 PM
Transit 4:37 PM
Moonset 9:07 PM

Best Times for Fishing or Hunting

Major Periods

3:43 AM - 6:13 AM
4:07 PM - 6:37 PM

Minor Periods

11:44 AM - 1:14 PM
8:37 PM - 10:07 PM
Action Rating:
Fair Action 2/5
Sunday, November 15, 2026

Weather Forecast

Conditions: Light Snow
Average Temperature: 29.3°F
Average Humidity: 85%
Chance of Rain: 19%
Wind: 11.1 mph
UV Index: 2.6

Air Quality

EPA Index 1 • Good
PM2.5
1 μg/m³
Good
PM10
1.6 μg/m³
Good
Ozone (O3)
77.9 μg/m³
Photochemical
NO2
0.4 μg/m³
Nitrogen Dioxide
SO2
0.1 μg/m³
Sulfur Dioxide
CO
118.8 μg/m³
Carbon Monoxide

Astronomical

Sun
9h 36m daylight
Sunrise 7:20 AM
Solar Noon 12:07 PM
Sunset 4:56 PM
Moon
Waxing Crescent • 31%
Moonrise 12:43 PM
Transit 5:23 PM
Moonset 10:12 PM

Best Times for Fishing or Hunting

Major Periods

4:30 AM - 7:00 AM
4:53 PM - 7:23 PM

Minor Periods

12:13 PM - 1:43 PM
9:42 PM - 11:12 PM
Action Rating:
Very Good 4/5
Monday, November 16, 2026

Weather Forecast

Conditions: Overcast
Average Temperature: 33.1°F
Average Humidity: 65%
Chance of Rain: 24%
Wind: 8.6 mph
UV Index: 2.4

Air Quality

EPA Index 1 • Good
PM2.5
2 μg/m³
Good
PM10
3.5 μg/m³
Good
Ozone (O3)
87.9 μg/m³
Photochemical
NO2
0.6 μg/m³
Nitrogen Dioxide
SO2
0.2 μg/m³
Sulfur Dioxide
CO
131.9 μg/m³
Carbon Monoxide

Astronomical

Sun
9h 34m daylight
Sunrise 7:21 AM
Solar Noon 12:08 PM
Sunset 4:55 PM
Moon
First Quarter • 42%
Moonrise 1:07 PM
Transit 6:08 PM
Moonset 11:18 PM

Best Times for Fishing or Hunting

Major Periods

5:16 AM - 7:46 AM
5:38 PM - 8:08 PM

Minor Periods

12:37 PM - 2:07 PM
10:48 PM - 12:18 AM
Action Rating:
Good Action 3/5
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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