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

Monsoons Return to the Southwest U.S.; Potential Atlantic Tropical System Interaction

In Arizona and New Mexico, heavy to excessive rainfall from monsoon thunderstorms may bring isolated flash and urban flooding Thursday into Sunday. The close proximity of Tropical Storm Humberto and a tropical wave (AL94) could lead to interaction between them, and details of their long-range track and intensity forecasts, and any potential impacts, are more uncertain than usual. Read More >

Current conditions at

MAMMOTH AT YELLOWSTONE NATIONAL PARK (YLAW4)

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

NA

53°F

12°C

Humidity 43%
Wind Speed SSW 5 MPH
Barometer NA
Dewpoint 31°F (-1°C)
Visibility NA
Last update 25 Sep 01:15 AM MDT
Extended Forecast for

Mammoth WY

  • Overnight

    Overnight: Clear, with a low around 43. South southeast wind around 5 mph.

    Low: 43 °F

    Clear

  • Thursday

    Thursday: Sunny, with a high near 77. South southwest wind 6 to 10 mph.

    High: 77 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 44. South southwest wind 5 to 8 mph becoming southeast in the evening.

    Low: 44 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 74. South wind 5 to 9 mph becoming west northwest in the afternoon.

    High: 74 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 41. West northwest wind 6 to 8 mph becoming south southeast after midnight.

    Low: 41 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 76. South southeast wind 5 to 7 mph.

    High: 76 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 44. Southwest wind 6 to 8 mph becoming south southeast after midnight.

    Low: 44 °F

    Mostly Clear

  • Sunday

    Sunday: A 10 percent chance of showers and thunderstorms after noon. Mostly sunny, with a high near 76.

    High: 76 °F

    Sunny then
    Slight Chance
    T-storms

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 46.

    Low: 46 °F

    Mostly Cloudy

Detailed Forecast

Overnight
Clear, with a low around 43. South southeast wind around 5 mph.
Thursday
Sunny, with a high near 77. South southwest wind 6 to 10 mph.
Thursday Night
Mostly clear, with a low around 44. South southwest wind 5 to 8 mph becoming southeast in the evening.
Friday
Sunny, with a high near 74. South wind 5 to 9 mph becoming west northwest in the afternoon.
Friday Night
Mostly clear, with a low around 41. West northwest wind 6 to 8 mph becoming south southeast after midnight.
Saturday
Sunny, with a high near 76. South southeast wind 5 to 7 mph.
Saturday Night
Mostly clear, with a low around 44. Southwest wind 6 to 8 mph becoming south southeast after midnight.
Sunday
A 10 percent chance of showers and thunderstorms after noon. Mostly sunny, with a high near 76.
Sunday Night
Mostly cloudy, with a low around 46.
Monday
A 40 percent chance of showers and thunderstorms after noon. Mostly sunny, with a high near 71.
Monday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 47.
Tuesday
A chance of showers and thunderstorms. Mostly cloudy, with a high near 63.
Tuesday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 43.
Wednesday
A chance of showers and thunderstorms. Mostly cloudy, with a high near 56.
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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:
12:48 am MDT Sep 25, 2025
Forecast Valid:
2am MDT Sep 25, 2025-6pm MDT Oct 1, 2025
 
Forecast Discussion
 
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Additional Resources

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Chance of Precipitation