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

Extreme Heat and Excessive Rainfall Today

Dangerous and extreme heat will remain across portions of the southern U.S. through the weekend. A heat wave over the Southwest U.S. will intensify this week, peaking and expanding into the Intermountain West and northern High Plains this weekend. Multiple rounds of thunderstorms will produce heavy to excessive rainfall with significant flash flooding across portions of southern New England. Read More >

Current conditions at

MAMMOTH AT YELLOWSTONE NATIONAL PARK (YLAW4)

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

NA

85°F

29°C

Humidity 20%
Wind Speed SE 9 MPH
Barometer NA
Dewpoint 40°F (4°C)
Visibility NA
Heat Index82°F (28°C)
Last update 29 Jul 06:15 PM MDT
Extended Forecast for

Mammoth Hot Springs WY

  • Tonight

    Tonight: A chance of showers and thunderstorms before midnight, then isolated showers between midnight and 2am. Patchy smoke before 8pm, then patchy smoke after 9pm. Mostly cloudy, then gradually becoming mostly clear, with a low around 52. West wind 5 to 10 mph becoming south southeast after midnight. Chance of precipitation is 30%.

    Low: 52 °F

    Chance
    T-storms then
    Isolated
    Showers

  • Thursday

    Thursday: Isolated showers and thunderstorms after 2pm. Areas of smoke. Increasing clouds, with a high near 85. Light and variable wind becoming southwest 9 to 14 mph in the afternoon. Winds could gust as high as 20 mph. Chance of precipitation is 20%.

    High: 85 °F

    Areas Smoke
    then Isolated
    T-storms

  • Thursday Night

    Thursday Night: Isolated showers and thunderstorms, mainly between 8pm and 9pm. Areas of smoke. Mostly cloudy, then gradually becoming mostly clear, with a low around 53. Northwest wind 5 to 8 mph becoming south southeast after midnight. Chance of precipitation is 10%.

    Low: 53 °F

    Isolated
    T-storms then
    Areas Smoke

  • Friday

    Friday: Sunny, with a high near 87. Light and variable wind becoming west around 5 mph in the afternoon.

    High: 87 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 54. West northwest wind around 5 mph becoming calm.

    Low: 54 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 93. Southeast wind 5 to 14 mph becoming southwest in the afternoon. Winds could gust as high as 26 mph.

    High: 93 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 56. South wind 9 to 13 mph, with gusts as high as 21 mph.

    Low: 56 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 89. Breezy.

    High: 89 °F

    Sunny then
    Sunny and
    Breezy

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 49. Breezy.

    Low: 49 °F

    Mostly Clear
    and Breezy
    then Mostly
    Clear

Detailed Forecast

Tonight
A chance of showers and thunderstorms before midnight, then isolated showers between midnight and 2am. Patchy smoke before 8pm, then patchy smoke after 9pm. Mostly cloudy, then gradually becoming mostly clear, with a low around 52. West wind 5 to 10 mph becoming south southeast after midnight. Chance of precipitation is 30%.
Thursday
Isolated showers and thunderstorms after 2pm. Areas of smoke. Increasing clouds, with a high near 85. Light and variable wind becoming southwest 9 to 14 mph in the afternoon. Winds could gust as high as 20 mph. Chance of precipitation is 20%.
Thursday Night
Isolated showers and thunderstorms, mainly between 8pm and 9pm. Areas of smoke. Mostly cloudy, then gradually becoming mostly clear, with a low around 53. Northwest wind 5 to 8 mph becoming south southeast after midnight. Chance of precipitation is 10%.
Friday
Sunny, with a high near 87. Light and variable wind becoming west around 5 mph in the afternoon.
Friday Night
Mostly clear, with a low around 54. West northwest wind around 5 mph becoming calm.
Saturday
Sunny, with a high near 93. Southeast wind 5 to 14 mph becoming southwest in the afternoon. Winds could gust as high as 26 mph.
Saturday Night
Mostly clear, with a low around 56. South wind 9 to 13 mph, with gusts as high as 21 mph.
Sunday
Sunny, with a high near 89. Breezy.
Sunday Night
Mostly clear, with a low around 49. Breezy.
Monday
Sunny, with a high near 80.
Monday Night
Mostly clear, with a low around 46.
Tuesday
Sunny, with a high near 82.
Tuesday Night
Mostly clear, with a low around 49.
Wednesday
Sunny, with a high near 86.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Mammoth Hot Springs WY
 44.96°N 110.69°W (Elev. 6106 ft)
Last Update:
6:01 pm MDT Jul 29, 2026
Forecast Valid:
7pm MDT Jul 29, 2026-6pm MDT Aug 5, 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