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

Heat the Southwest; Fire Weather in the Central U.S.; Kona Low Impacting Hawaii

A rare March heat wave is ongoing with much above-normal temperatures over the Southwest U.S. through this weekend. Periods of critical fire weather will persist from the central Rockies to the central and southern Plains through the weekend as gusty winds and low relative humidity continue. A Kona low will continue to bring several rounds of moderate to heavy rainfall to Hawaii through Sunday. Read More >

Hazardous Weather Conditions

Current conditions at

MAMMOTH AT YELLOWSTONE NATIONAL PARK (YLAW4)

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

NA

61°F

16°C

Humidity 24%
Wind Speed SSW 9 MPH
Barometer NA
Dewpoint 24°F (-4°C)
Visibility NA
Last update 21 Mar 04:15 PM MDT
Extended Forecast for

Mammoth WY

  • This Afternoon

    This Afternoon: Scattered showers and thunderstorms, mainly before 5pm. Mostly cloudy, with a steady temperature around 60. Breezy, with a west southwest wind 10 to 16 mph, with gusts as high as 24 mph. Chance of precipitation is 30%.

    High: 60 °F

    Scattered
    Showers and
    Breezy

  • Tonight

    Tonight: Isolated showers before 7pm. Snow level 9500 feet lowering to 6000 feet after midnight . Mostly cloudy, then gradually becoming mostly clear, with a low around 32. Breezy, with a northwest wind 5 to 15 mph becoming southwest after midnight. Winds could gust as high as 23 mph. Chance of precipitation is 20%.

    Low: 32 °F

    Isolated
    Showers and
    Breezy then
    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 56. South southwest wind 5 to 10 mph becoming west in the afternoon. Winds could gust as high as 23 mph.

    High: 56 °F

    Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 35. West southwest wind 5 to 10 mph becoming south southeast after midnight. Winds could gust as high as 23 mph.

    Low: 35 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 59. South southeast wind 5 to 10 mph becoming southwest in the afternoon. Winds could gust as high as 21 mph.

    High: 59 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 40. South wind 6 to 10 mph, with gusts as high as 21 mph.

    Low: 40 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Mostly cloudy, with a high near 60. Southwest wind 6 to 14 mph, with gusts as high as 29 mph.

    High: 60 °F

    Mostly Cloudy

  • Tuesday Night

    Tuesday Night: A 20 percent chance of showers before midnight. Mostly cloudy, with a low around 44.

    Low: 44 °F

    Slight Chance
    Showers then
    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 63. Breezy.

    High: 63 °F

    Partly Sunny
    then Mostly
    Sunny and
    Breezy

Detailed Forecast

This Afternoon
Scattered showers and thunderstorms, mainly before 5pm. Mostly cloudy, with a steady temperature around 60. Breezy, with a west southwest wind 10 to 16 mph, with gusts as high as 24 mph. Chance of precipitation is 30%.
Tonight
Isolated showers before 7pm. Snow level 9500 feet lowering to 6000 feet after midnight . Mostly cloudy, then gradually becoming mostly clear, with a low around 32. Breezy, with a northwest wind 5 to 15 mph becoming southwest after midnight. Winds could gust as high as 23 mph. Chance of precipitation is 20%.
Sunday
Sunny, with a high near 56. South southwest wind 5 to 10 mph becoming west in the afternoon. Winds could gust as high as 23 mph.
Sunday Night
Partly cloudy, with a low around 35. West southwest wind 5 to 10 mph becoming south southeast after midnight. Winds could gust as high as 23 mph.
Monday
Mostly sunny, with a high near 59. South southeast wind 5 to 10 mph becoming southwest in the afternoon. Winds could gust as high as 21 mph.
Monday Night
Mostly cloudy, with a low around 40. South wind 6 to 10 mph, with gusts as high as 21 mph.
Tuesday
Mostly cloudy, with a high near 60. Southwest wind 6 to 14 mph, with gusts as high as 29 mph.
Tuesday Night
A 20 percent chance of showers before midnight. Mostly cloudy, with a low around 44.
Wednesday
Mostly sunny, with a high near 63. Breezy.
Wednesday Night
Mostly cloudy, with a low around 38.
Thursday
Mostly sunny, with a high near 55.
Thursday Night
Partly cloudy, with a low around 30.
Friday
Mostly sunny, with a high near 57.
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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:
4:03 pm MDT Mar 21, 2026
Forecast Valid:
4pm MDT Mar 21, 2026-6pm MDT Mar 27, 2026
 
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