National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Heat in the Central U.S.; Heavy Rain Possible for South Texas; Monitoring Erin Tropical Impacts

Hot temperatures are forecast over the Plains and into the lower Mississippi River Valley Friday where Heat Advisories have been issued. Heavy rain from a disturbance in the western Gulf could bring flooding to south Texas. Erin could bring tropical storm conditions and heavy rain to Puerto Rico and the USVI this weekend with dangerous surf and rip currents impacting the western Atlantic Basin. Read More >

Hazardous Weather Conditions

Current conditions at

MAMMOTH AT YELLOWSTONE NATIONAL PARK (YLAW4)

Lat: 44.977222°NLon: 110.695278°WElev: 6138.0ft.

NA

66°F

19°C

Humidity 32%
Wind Speed S 3 MPH
Barometer NA
Dewpoint 35°F (2°C)
Visibility NA
Last update 15 Aug 01:15 AM MDT
Extended Forecast for

Mammoth WY

  • Overnight

    Overnight: Mostly clear, with a low around 53. South southeast wind around 6 mph.

    Low: 53 °F

    Mostly Clear

  • Friday

    Friday: Isolated showers and thunderstorms between 3pm and 4pm. Patchy smoke between 10am and 2pm. Sunny, with a high near 85. Southeast wind 6 to 14 mph becoming west southwest in the morning. Winds could gust as high as 21 mph. Chance of precipitation is 20%.

    High: 85 °F

    Patchy Smoke
    then Isolated
    T-storms

  • Friday Night

    Friday Night: Partly cloudy, with a low around 55. West southwest wind 8 to 14 mph becoming east southeast after midnight. Winds could gust as high as 20 mph.

    Low: 55 °F

    Partly Cloudy

  • Saturday

    Saturday: Scattered showers and thunderstorms, mainly between 2pm and 3pm, then isolated thunderstorms after 3pm. Mostly sunny, with a high near 84. Southeast wind 7 to 14 mph becoming southwest in the afternoon. Winds could gust as high as 20 mph. Chance of precipitation is 30%.

    High: 84 °F

    Mostly Sunny
    then
    Scattered
    T-storms

  • Saturday Night

    Saturday Night: Isolated showers and thunderstorms before 9pm, then isolated showers between 9pm and midnight. Partly cloudy, with a low around 52. Southwest wind 6 to 11 mph becoming south southeast after midnight. Chance of precipitation is 20%.

    Low: 52 °F

    Isolated
    T-storms then
    Partly Cloudy

  • Sunday

    Sunday: A 40 percent chance of showers and thunderstorms after noon. Mostly sunny, with a high near 84. South southeast wind 6 to 10 mph becoming southwest in the afternoon. Winds could gust as high as 21 mph.

    High: 84 °F

    Mostly Sunny
    then Chance
    T-storms

  • Sunday Night

    Sunday Night: A 30 percent chance of showers and thunderstorms before midnight. Partly cloudy, with a low around 51. Southwest wind 6 to 9 mph becoming north in the evening.

    Low: 51 °F

    Chance
    Showers then
    Partly Cloudy

  • Monday

    Monday: Sunny, with a high near 85.

    High: 85 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 52.

    Low: 52 °F

    Mostly Clear

Detailed Forecast

Overnight
Mostly clear, with a low around 53. South southeast wind around 6 mph.
Friday
Isolated showers and thunderstorms between 3pm and 4pm. Patchy smoke between 10am and 2pm. Sunny, with a high near 85. Southeast wind 6 to 14 mph becoming west southwest in the morning. Winds could gust as high as 21 mph. Chance of precipitation is 20%.
Friday Night
Partly cloudy, with a low around 55. West southwest wind 8 to 14 mph becoming east southeast after midnight. Winds could gust as high as 20 mph.
Saturday
Scattered showers and thunderstorms, mainly between 2pm and 3pm, then isolated thunderstorms after 3pm. Mostly sunny, with a high near 84. Southeast wind 7 to 14 mph becoming southwest in the afternoon. Winds could gust as high as 20 mph. Chance of precipitation is 30%.
Saturday Night
Isolated showers and thunderstorms before 9pm, then isolated showers between 9pm and midnight. Partly cloudy, with a low around 52. Southwest wind 6 to 11 mph becoming south southeast after midnight. Chance of precipitation is 20%.
Sunday
A 40 percent chance of showers and thunderstorms after noon. Mostly sunny, with a high near 84. South southeast wind 6 to 10 mph becoming southwest in the afternoon. Winds could gust as high as 21 mph.
Sunday Night
A 30 percent chance of showers and thunderstorms before midnight. Partly cloudy, with a low around 51. Southwest wind 6 to 9 mph becoming north in the evening.
Monday
Sunny, with a high near 85.
Monday Night
Mostly clear, with a low around 52.
Tuesday
Sunny, with a high near 89.
Tuesday Night
Mostly clear, with a low around 54.
Wednesday
Sunny, with a high near 90.
Wednesday Night
Mostly clear, with a low around 53.
Thursday
Sunny, with a high near 89.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Mammoth WY
 44.98°N 110.69°W (Elev. 5745 ft)
Last Update:
12:43 am MDT Aug 15, 2025
Forecast Valid:
2am MDT Aug 15, 2025-6pm MDT Aug 21, 2025
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation