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

Dangerous Heat and Possible Flooding

Dangerous heat will persist across the Southwest U.S. through Saturday with daytime highs of 110-115°F. Extreme Heat Warnings remain in effect. Dangerous heat will build across the southern Plains again beginning this weekend. Heavy to excessive rain over the Carolinas Friday may lead to isolated areas of flash flooding. Read More >

Current conditions at

MAMMOTH AT YELLOWSTONE NATIONAL PARK (YLAW4)

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

NA

80°F

27°C

Humidity 23%
Wind Speed S 11 MPH
Barometer NA
Dewpoint 39°F (4°C)
Visibility NA
Heat Index79°F (26°C)
Last update 27 Aug 05:15 PM MDT
Extended Forecast for

Mammoth Hot Springs WY

  • Tonight

    Tonight: Scattered showers and thunderstorms before 1am, then isolated showers after 5am. Mostly cloudy, with a low around 49. South southwest wind 7 to 10 mph, with gusts as high as 22 mph. Chance of precipitation is 40%.

    Low: 49 °F

    Scattered
    T-storms then
    Isolated
    Showers

  • Friday

    Friday: Scattered showers and thunderstorms before 11am, then showers likely and possibly a thunderstorm between 11am and 3pm, then scattered showers and thunderstorms after 3pm. Mostly cloudy, with a high near 67. South southwest wind 6 to 9 mph, with gusts as high as 21 mph. Chance of precipitation is 70%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 67 °F

    Showers
    Likely

  • Friday Night

    Friday Night: Showers and thunderstorms likely, then showers after midnight. Low around 46. South wind around 8 mph, with gusts as high as 20 mph. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 46 °F

    Showers
    Likely then
    Showers

  • Saturday

    Saturday: Showers, with thunderstorms also possible after 9am. High near 61. Southwest wind 7 to 11 mph, with gusts as high as 24 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.

    High: 61 °F

    Showers

  • Saturday Night

    Saturday Night: Showers and possibly a thunderstorm. Low around 43. South wind 9 to 11 mph, with gusts as high as 24 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 43 °F

    Showers

  • Sunday

    Sunday: Showers likely and possibly a thunderstorm before noon, then a chance of showers and thunderstorms after noon. Partly sunny, with a high near 62. Breezy, with a southwest wind 9 to 14 mph increasing to 15 to 20 mph in the afternoon. Winds could gust as high as 33 mph. Chance of precipitation is 70%.

    High: 62 °F

    Breezy.
    Showers
    Likely then
    Chance
    T-storms

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 37. South southwest wind 10 to 14 mph, with gusts as high as 26 mph.

    Low: 37 °F

    Partly Cloudy

  • Monday

    Monday: Sunny, with a high near 66.

    High: 66 °F

    Sunny

  • Monday Night

    Monday Night: A 20 percent chance of showers and thunderstorms before midnight. Mostly clear, with a low around 41.

    Low: 41 °F

    Slight Chance
    T-storms then
    Mostly Clear

Detailed Forecast

Tonight
Scattered showers and thunderstorms before 1am, then isolated showers after 5am. Mostly cloudy, with a low around 49. South southwest wind 7 to 10 mph, with gusts as high as 22 mph. Chance of precipitation is 40%.
Friday
Scattered showers and thunderstorms before 11am, then showers likely and possibly a thunderstorm between 11am and 3pm, then scattered showers and thunderstorms after 3pm. Mostly cloudy, with a high near 67. South southwest wind 6 to 9 mph, with gusts as high as 21 mph. Chance of precipitation is 70%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Friday Night
Showers and thunderstorms likely, then showers after midnight. Low around 46. South wind around 8 mph, with gusts as high as 20 mph. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Saturday
Showers, with thunderstorms also possible after 9am. High near 61. Southwest wind 7 to 11 mph, with gusts as high as 24 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.
Saturday Night
Showers and possibly a thunderstorm. Low around 43. South wind 9 to 11 mph, with gusts as high as 24 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Sunday
Showers likely and possibly a thunderstorm before noon, then a chance of showers and thunderstorms after noon. Partly sunny, with a high near 62. Breezy, with a southwest wind 9 to 14 mph increasing to 15 to 20 mph in the afternoon. Winds could gust as high as 33 mph. Chance of precipitation is 70%.
Sunday Night
Partly cloudy, with a low around 37. South southwest wind 10 to 14 mph, with gusts as high as 26 mph.
Monday
Sunny, with a high near 66.
Monday Night
A 20 percent chance of showers and thunderstorms before midnight. Mostly clear, with a low around 41.
Tuesday
A 20 percent chance of showers and thunderstorms after noon. Sunny, with a high near 68.
Tuesday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 41.
Wednesday
A chance of showers and thunderstorms. Sunny, with a high near 65. Breezy.
Wednesday Night
A slight chance of showers. Mostly cloudy, with a low around 40. Breezy.
Thursday
A chance of showers and thunderstorms. Mostly sunny, with a high near 62. Breezy.
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ABOUT THIS FORECAST

 
Point Forecast:
Mammoth Hot Springs WY
 44.96°N 110.75°W (Elev. 7382 ft)
Last Update:
6:01 pm MDT Aug 27, 2026
Forecast Valid:
6pm MDT Aug 27, 2026-6pm MDT Sep 3, 2026
 
Forecast Discussion
 
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Additional Resources

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