Weather for Yellowstone National Park, Wyoming
Current Weather
63°F
Conditions: Cloudy
Humidity: 52%
Feels Like: 63°F
Wind: ENE 4.9 mph
Wind Gusts: 10.3 mph
Humidity: 52%
Feels Like: 63°F
Wind: ENE 4.9 mph
Wind Gusts: 10.3 mph
Pressure: 30.37 in
Precipitation: 0 in
Cloud Cover: 0%
Visibility: 6 mi
UV Index: 0
Precipitation: 0 in
Cloud Cover: 0%
Visibility: 6 mi
UV Index: 0
Five Day Weather Forecast
Mon
H: 71°F
L: 42°F
Tue
H: 66°F
L: 46°F
Wed
H: 63°F
L: 48°F
Thu
H: 63°F
L: 46°F
Fri
H: 55°F
L: 44°F
Air Quality
AQI:
1 - Good
PM2.5:
6.66 μg/m3
PM10:
7.22 μg/m3
Carbon Monoxide: 218.3 μg/m3
Nitrogen Dioxide: 9.99 μg/m3
Sulphur Dioxide: 0.74 μg/m3
Ozone: 64 μg/m3
Nitrogen Dioxide: 9.99 μg/m3
Sulphur Dioxide: 0.74 μg/m3
Ozone: 64 μg/m3
Astronomical
Sunrise: 6:36 AM
Sun Transit: 1:23 PM
Sunset: 8:10 PM
Daylight: 13 hrs 34 mins
Sun Transit: 1:23 PM
Sunset: 8:10 PM
Daylight: 13 hrs 34 mins
Moonrise: 9:11 AM
Moon Transit: 3:15 PM
Moonset: 9:07 PM
Moon Phase: New
Moon Illumination: 1.9%
Moon Transit: 3:15 PM
Moonset: 9:07 PM
Moon Phase: New
Moon Illumination: 1.9%
Best Times for Fishing or Hunting
Major Periods
12:00 AM - 12:00 AM2:45 PM - 5:15 PM
Minor Periods
8:37 PM - 10:07 PM8:41 AM - 10:11 AM
Action Rating: 4 out of 5
Hydrologic Outlook issued August 25 at 4:54PM MDT by NWS Great Falls MT
Effective: Mon August 25, 2025, 4:54 PM
Expires: Tue August 26, 2025, 4:00 PM
ESFTFX Monsoon moisture will slowly move northward and bring periods of widespread rain and embedded thunderstorms to Southwest and portions of Central Montana Tuesday night through Friday. Localized heavier downpours in excess of a half inch per hour can be expected with the heavier cells in addition to the general four day storm totals between a quarter to an inch and a half. The most persistent and heaviest rainfall is expected along and south of I90 on Wednesday and Thursday. Impacts will mostly be limited to sensitive burn scars or other normally flood prone locations or areas of steep terrain and may include instances of localized flooding, debris flows, and rock slides. Those considering any backcountry travel for Wednesday and Thursday of this week should be prepared for periods of excessive rainfall, muddy roads, and potential localized flooding.
Monday, August 25, 2025
Weather Forecast
Conditions: Sunny
Average Temperature: 55.9°F
Average Humidity: 53%
Average Temperature: 55.9°F
Average Humidity: 53%
Chance of Rain: 0%
Wind: 8.3 mph
UV Index: 2.2
Wind: 8.3 mph
UV Index: 2.2
Air Quality
AQI:
1 - Good
PM2.5:
11.72 μg/m3
PM10:
12.56 μg/m3
Carbon Monoxide: 259.37 μg/m3
Nitrogen Dioxide: 5.04 μg/m3
Sulphur Dioxide: 1.21 μg/m3
Ozone: 99.6 μg/m3
Nitrogen Dioxide: 5.04 μg/m3
Sulphur Dioxide: 1.21 μg/m3
Ozone: 99.6 μg/m3
Astronomical
Sunrise: 6:36 AM
Sun Transit: 1:23 PM
Sunset: 8:10 PM
Daylight: 13 hrs 34 mins
Sun Transit: 1:23 PM
Sunset: 8:10 PM
Daylight: 13 hrs 34 mins
Moonrise: 9:11 AM
Moon Transit: 3:15 PM
Moonset: 9:07 PM
Moon Phase: New
Moon Illumination: 1.9%
Moon Transit: 3:15 PM
Moonset: 9:07 PM
Moon Phase: New
Moon Illumination: 1.9%
Best Times for Fishing or Hunting
Major Periods
12:00 AM - 12:00 AM2:45 PM - 5:15 PM
Minor Periods
8:37 PM - 10:07 PM8:41 AM - 10:11 AM
Action Rating: 4 out of 5
Tuesday, August 26, 2025
Weather Forecast
Conditions: Partly Cloudy
Average Temperature: 55.9°F
Average Humidity: 55%
Average Temperature: 55.9°F
Average Humidity: 55%
Chance of Rain: 0%
Wind: 6.7 mph
UV Index: 1.4
Wind: 6.7 mph
UV Index: 1.4
Air Quality
AQI:
1 - Good
PM2.5:
12.7 μg/m3
PM10:
14.22 μg/m3
Carbon Monoxide: 226.59 μg/m3
Nitrogen Dioxide: 4.88 μg/m3
Sulphur Dioxide: 0.85 μg/m3
Ozone: 94.84 μg/m3
Nitrogen Dioxide: 4.88 μg/m3
Sulphur Dioxide: 0.85 μg/m3
Ozone: 94.84 μg/m3
Astronomical
Sunrise: 6:37 AM
Sun Transit: 1:23 PM
Sunset: 8:09 PM
Daylight: 13 hrs 31 mins
Sun Transit: 1:23 PM
Sunset: 8:09 PM
Daylight: 13 hrs 31 mins
Moonrise: 10:17 AM
Moon Transit: 3:55 PM
Moonset: 9:24 PM
Moon Phase: Waxing Crescent
Moon Illumination: 6.1%
Moon Transit: 3:55 PM
Moonset: 9:24 PM
Moon Phase: Waxing Crescent
Moon Illumination: 6.1%
Best Times for Fishing or Hunting
Major Periods
12:17 AM - 2:47 AM3:25 PM - 5:55 PM
Minor Periods
8:54 PM - 10:24 PM9:47 AM - 11:17 AM
Action Rating: 2 out of 5
Wednesday, August 27, 2025
Weather Forecast
Conditions: Overcast
Average Temperature: 55.8°F
Average Humidity: 64%
Average Temperature: 55.8°F
Average Humidity: 64%
Chance of Rain: 0%
Wind: 8.3 mph
UV Index: 1
Wind: 8.3 mph
UV Index: 1
Air Quality
AQI:
1 - Good
PM2.5:
14.43 μg/m3
PM10:
16.15 μg/m3
Carbon Monoxide: 235.17 μg/m3
Nitrogen Dioxide: 5.87 μg/m3
Sulphur Dioxide: 1.15 μg/m3
Ozone: 87.92 μg/m3
Nitrogen Dioxide: 5.87 μg/m3
Sulphur Dioxide: 1.15 μg/m3
Ozone: 87.92 μg/m3
Astronomical
Sunrise: 6:39 AM
Sun Transit: 1:22 PM
Sunset: 8:07 PM
Daylight: 13 hrs 28 mins
Sun Transit: 1:22 PM
Sunset: 8:07 PM
Daylight: 13 hrs 28 mins
Moonrise: 11:22 AM
Moon Transit: 4:37 PM
Moonset: 9:42 PM
Moon Phase: Waxing Crescent
Moon Illumination: 12.6%
Moon Transit: 4:37 PM
Moonset: 9:42 PM
Moon Phase: Waxing Crescent
Moon Illumination: 12.6%
Best Times for Fishing or Hunting
Major Periods
12:58 AM - 3:28 AM4:07 PM - 6:37 PM
Minor Periods
9:12 PM - 10:42 PM10:52 AM - 12:22 AM
Action Rating: 2 out of 5
Thursday, August 28, 2025
Weather Forecast
Conditions: Moderate rain
Average Temperature: 52.5°F
Average Humidity: 81%
Average Temperature: 52.5°F
Average Humidity: 81%
Chance of Rain: 89%
Wind: 7.8 mph
UV Index: 0.6
Wind: 7.8 mph
UV Index: 0.6
Air Quality
AQI:
1 - Good
PM2.5:
11.25 μg/m3
PM10:
11.97 μg/m3
Carbon Monoxide: 232.88 μg/m3
Nitrogen Dioxide: 4.68 μg/m3
Sulphur Dioxide: 0.55 μg/m3
Ozone: 94.24 μg/m3
Nitrogen Dioxide: 4.68 μg/m3
Sulphur Dioxide: 0.55 μg/m3
Ozone: 94.24 μg/m3
Astronomical
Sunrise: 6:40 AM
Sun Transit: 1:22 PM
Sunset: 8:05 PM
Daylight: 13 hrs 25 mins
Sun Transit: 1:22 PM
Sunset: 8:05 PM
Daylight: 13 hrs 25 mins
Moonrise: 12:29 AM
Moon Transit: 5:19 PM
Moonset: 10:03 PM
Moon Phase: Waxing Crescent
Moon Illumination: 21.1%
Moon Transit: 5:19 PM
Moonset: 10:03 PM
Moon Phase: Waxing Crescent
Moon Illumination: 21.1%
Best Times for Fishing or Hunting
Major Periods
1:40 AM - 4:10 AM4:49 PM - 7:19 PM
Minor Periods
9:33 PM - 11:03 PM11:59 AM - 1:29 PM
Action Rating: 2 out of 5
Friday, August 29, 2025
Weather Forecast
Conditions: Moderate rain
Average Temperature: 48.9°F
Average Humidity: 83%
Average Temperature: 48.9°F
Average Humidity: 83%
Chance of Rain: 89%
Wind: 8.3 mph
UV Index: 1.1
Wind: 8.3 mph
UV Index: 1.1
Air Quality
AQI:
1 - Good
PM2.5:
11.01 μg/m3
PM10:
11.37 μg/m3
Carbon Monoxide: 290.17 μg/m3
Nitrogen Dioxide: 5.79 μg/m3
Sulphur Dioxide: 0.09 μg/m3
Ozone: 97.46 μg/m3
Nitrogen Dioxide: 5.79 μg/m3
Sulphur Dioxide: 0.09 μg/m3
Ozone: 97.46 μg/m3
Astronomical
Sunrise: 6:41 AM
Sun Transit: 1:22 PM
Sunset: 8:03 PM
Daylight: 13 hrs 22 mins
Sun Transit: 1:22 PM
Sunset: 8:03 PM
Daylight: 13 hrs 22 mins
Moonrise: 1:35 PM
Moon Transit: 6:05 PM
Moonset: 10:29 PM
Moon Phase: Waxing Crescent
Moon Illumination: 31.0%
Moon Transit: 6:05 PM
Moonset: 10:29 PM
Moon Phase: Waxing Crescent
Moon Illumination: 31.0%
Best Times for Fishing or Hunting
Major Periods
2:23 AM - 4:53 AM5:35 PM - 8:05 PM
Minor Periods
9:59 PM - 11:29 PM1:05 PM - 2:35 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.