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

Lake Effect Snow through Friday; Heavy Rain, Thunderstorms and Mountain Snow in California

Periods of moderate to heavy lake effect snow will continue through Friday downwind of Lake Erie and Ontario. Several additional inches of accumulating snow are expected. A Pacific storm will bring heavy rain and mountain snow across California, the Southwest and Intermountain West today. Isolated severe thunderstorms and scattered flash flooding is possible across parts of southern California. Read More >

Hazardous Weather Conditions

Current conditions at

MAMMOTH AT YELLOWSTONE NATIONAL PARK (YLAW4)

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

NA

38°F

3°C

Humidity 45%
Wind Speed S 7 MPH
Barometer NA
Dewpoint 19°F (-7°C)
Visibility NA
Wind Chill33°F (1°C)
Last update 01 Jan 04:15 PM MST
Extended Forecast for

Mammoth WY

  • New Year's Day

    New Year's Day: A chance of rain and snow showers. Snow level 5800 feet. Cloudy, with a high near 36. South southeast wind around 8 mph. Chance of precipitation is 30%.

    High: 36 °F

    Chance
    Rain/Snow

  • Tonight

    Tonight: A chance of rain and snow showers. Snow level 5800 feet. Mostly cloudy, with a low around 33. Southeast wind 5 to 8 mph. Chance of precipitation is 50%. Little or no snow accumulation expected.

    Low: 33 °F

    Chance
    Rain/Snow

  • Friday

    Friday: A chance of rain and snow showers, mainly before 10am. Snow level 5900 feet rising to 6800 feet in the afternoon. Mostly cloudy, with a high near 40. South wind 3 to 8 mph. Chance of precipitation is 30%.

    High: 40 °F

    Chance
    Rain/Snow
    then Partly
    Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 35. South southwest wind around 9 mph.

    Low: 35 °F

    Mostly Cloudy

  • Saturday

    Saturday: Partly sunny, with a high near 45. South wind 8 to 10 mph, with gusts as high as 24 mph.

    High: 45 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: A slight chance of rain showers before 8pm, then a chance of rain and snow showers. Snow level 6400 feet. Mostly cloudy, with a low around 34. South wind around 10 mph, with gusts as high as 21 mph. Chance of precipitation is 30%.

    Low: 34 °F

    Chance
    Rain/Snow

  • Sunday

    Sunday: A chance of rain and snow showers. Snow level 6200 feet. Mostly cloudy, with a high near 42. South southwest wind 10 to 13 mph, with gusts as high as 28 mph. Chance of precipitation is 40%.

    High: 42 °F

    Chance
    Rain/Snow

  • Sunday Night

    Sunday Night: A chance of rain and snow showers. Snow level 6100 feet. Mostly cloudy, with a low around 33. Chance of precipitation is 30%.

    Low: 33 °F

    Chance
    Rain/Snow

  • Monday

    Monday: A chance of rain and snow showers before 11am, then a chance of snow showers. Mostly cloudy, with a high near 40. Chance of precipitation is 50%.

    High: 40 °F

    Chance
    Rain/Snow
    then Chance
    Snow Showers

Detailed Forecast

New Year's Day
A chance of rain and snow showers. Snow level 5800 feet. Cloudy, with a high near 36. South southeast wind around 8 mph. Chance of precipitation is 30%.
Tonight
A chance of rain and snow showers. Snow level 5800 feet. Mostly cloudy, with a low around 33. Southeast wind 5 to 8 mph. Chance of precipitation is 50%. Little or no snow accumulation expected.
Friday
A chance of rain and snow showers, mainly before 10am. Snow level 5900 feet rising to 6800 feet in the afternoon. Mostly cloudy, with a high near 40. South wind 3 to 8 mph. Chance of precipitation is 30%.
Friday Night
Mostly cloudy, with a low around 35. South southwest wind around 9 mph.
Saturday
Partly sunny, with a high near 45. South wind 8 to 10 mph, with gusts as high as 24 mph.
Saturday Night
A slight chance of rain showers before 8pm, then a chance of rain and snow showers. Snow level 6400 feet. Mostly cloudy, with a low around 34. South wind around 10 mph, with gusts as high as 21 mph. Chance of precipitation is 30%.
Sunday
A chance of rain and snow showers. Snow level 6200 feet. Mostly cloudy, with a high near 42. South southwest wind 10 to 13 mph, with gusts as high as 28 mph. Chance of precipitation is 40%.
Sunday Night
A chance of rain and snow showers. Snow level 6100 feet. Mostly cloudy, with a low around 33. Chance of precipitation is 30%.
Monday
A chance of rain and snow showers before 11am, then a chance of snow showers. Mostly cloudy, with a high near 40. Chance of precipitation is 50%.
Monday Night
A 20 percent chance of snow showers before 11pm. Mostly cloudy, with a low around 26.
Tuesday
A slight chance of snow showers. Partly sunny, with a high near 36.
Tuesday Night
Mostly cloudy, with a low around 26.
Wednesday
A chance of snow showers. Partly sunny, with a high near 36.
Wednesday Night
A slight chance of snow showers. Mostly cloudy, with a low around 19.
Thursday
A chance of snow showers. Partly sunny, with a high near 33.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Mammoth WY
 44.98°N 110.69°W (Elev. 5745 ft)
Last Update:
5:01 pm MST Jan 1, 2026
Forecast Valid:
5pm MST Jan 1, 2026-6pm MST Jan 8, 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