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

Severe Thunderstorm and Heavy Rainfall Threat Tonight; Heat Continues on Tuesday Across the Eastern U.S.

Severe weather and flash flooding threats continue across the Central Plains and Midwest into tonight. Very large hail, strong tornadoes and damaging winds are expected. An early season heat wave will continue to challenge temperature records across the eastern U.S. through Wednesday. Read More >

Current conditions at

MAMMOTH AT YELLOWSTONE NATIONAL PARK (YLAW4)

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

NA

42°F

6°C

Humidity 34%
Wind Speed NNW 8 MPH
Barometer NA
Dewpoint 15°F (-9°C)
Visibility NA
Wind Chill37°F (3°C)
Last update 18 May 07:15 PM MDT
Extended Forecast for

Mammoth Hot Springs WY

  • Tonight

    Tonight: Mostly clear, with a low around 25. North northwest wind 5 to 9 mph becoming light and variable.

    Low: 25 °F

    Mostly Clear

  • Tuesday

    Tuesday: Isolated showers after 4pm. Increasing clouds, with a high near 56. Light and variable wind becoming west 8 to 13 mph in the afternoon. Chance of precipitation is 20%.

    High: 56 °F

    Sunny then
    Isolated
    Showers

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 32. West wind 6 to 11 mph becoming light south southwest. Winds could gust as high as 20 mph.

    Low: 32 °F

    Partly Cloudy

  • Wednesday

    Wednesday: A 30 percent chance of showers and thunderstorms after noon. Snow level rising to 8300 feet in the afternoon. Increasing clouds, with a high near 58. Light and variable wind becoming west southwest 5 to 8 mph in the morning. Winds could gust as high as 22 mph.

    High: 58 °F

    Mostly Sunny
    then Chance
    Showers

  • Wednesday Night

    Wednesday Night: Rain showers likely before midnight, then rain and snow showers. Some thunder is also possible. Low around 36. West wind 5 to 8 mph becoming calm in the evening. Winds could gust as high as 21 mph. Chance of precipitation is 90%. Little or no snow accumulation expected.

    Low: 36 °F

    Showers
    Likely then
    Rain/Snow

  • Thursday

    Thursday: Rain and snow showers likely, mainly before noon. Some thunder is also possible. Snow level 7000 feet rising to 7800 feet in the afternoon. Partly sunny, with a high near 54. North wind 3 to 8 mph. Winds could gust as high as 20 mph. Chance of precipitation is 70%.

    High: 54 °F

    Rain/Snow
    Likely then
    Chance
    Rain/Snow

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 33. North wind 3 to 8 mph.

    Low: 33 °F

    Partly Cloudy

  • Friday

    Friday: A 20 percent chance of showers and thunderstorms after noon. Snow level 6900 feet rising to 8800 feet in the afternoon. Mostly sunny, with a high near 61.

    High: 61 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

  • Friday Night

    Friday Night: Partly cloudy, with a low around 36.

    Low: 36 °F

    Partly Cloudy

Detailed Forecast

Tonight
Mostly clear, with a low around 25. North northwest wind 5 to 9 mph becoming light and variable.
Tuesday
Isolated showers after 4pm. Increasing clouds, with a high near 56. Light and variable wind becoming west 8 to 13 mph in the afternoon. Chance of precipitation is 20%.
Tuesday Night
Partly cloudy, with a low around 32. West wind 6 to 11 mph becoming light south southwest. Winds could gust as high as 20 mph.
Wednesday
A 30 percent chance of showers and thunderstorms after noon. Snow level rising to 8300 feet in the afternoon. Increasing clouds, with a high near 58. Light and variable wind becoming west southwest 5 to 8 mph in the morning. Winds could gust as high as 22 mph.
Wednesday Night
Rain showers likely before midnight, then rain and snow showers. Some thunder is also possible. Low around 36. West wind 5 to 8 mph becoming calm in the evening. Winds could gust as high as 21 mph. Chance of precipitation is 90%. Little or no snow accumulation expected.
Thursday
Rain and snow showers likely, mainly before noon. Some thunder is also possible. Snow level 7000 feet rising to 7800 feet in the afternoon. Partly sunny, with a high near 54. North wind 3 to 8 mph. Winds could gust as high as 20 mph. Chance of precipitation is 70%.
Thursday Night
Partly cloudy, with a low around 33. North wind 3 to 8 mph.
Friday
A 20 percent chance of showers and thunderstorms after noon. Snow level 6900 feet rising to 8800 feet in the afternoon. Mostly sunny, with a high near 61.
Friday Night
Partly cloudy, with a low around 36.
Saturday
Sunny, with a high near 68.
Saturday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 40.
Sunday
Sunny, with a high near 74.
Sunday Night
Partly cloudy, with a low around 43.
Memorial Day
A slight chance of showers and thunderstorms. Sunny, with a high near 74. Breezy.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Mammoth Hot Springs WY
 44.96°N 110.69°W (Elev. 6106 ft)
Last Update:
6:01 pm MDT May 18, 2026
Forecast Valid:
7pm MDT May 18, 2026-6pm MDT May 25, 2026
 
Forecast Discussion
 
Get as KML Get as XML

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