Heavy Great Lakes Snow through Friday; Extreme Cold and Potential for Major Winter Storm Late Week into this Weekend

Multiple clipper systems will bring cold temperatures and enhance lake-effect snow downwind of the Great Lakes. An arctic blast will bring frigid temperatures accompanied with gusty winds that may lead to dangerous wind chills beginning in the Northern Plains Thursday before expanding to the South and East. An expansive winter storm will start Friday in the Southern Rockies/Plains and Mid-South. Read More >

Hazardous Weather Conditions

Current conditions at

MAMMOTH AT YELLOWSTONE NATIONAL PARK (YLAW4)

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

NA

10°F

-12°C

Humidity 72%
Wind Speed S 5 MPH
Barometer NA
Dewpoint 3°F (-16°C)
Visibility NA
Wind Chill1°F (-17°C)
Last update 21 Jan 08:15 AM MST
Extended Forecast for

Mammoth WY

  • Today

    Today: Sunny, with a high near 26. Southeast wind 3 to 5 mph.

    High: 26 °F

    Sunny

  • Tonight

    Tonight: Mostly cloudy, with a low around 11. South wind 3 to 5 mph.

    Low: 11 °F

    Mostly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 27. Light and variable wind.

    High: 27 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 7. North wind around 5 mph becoming calm  in the evening.

    Low: 7 °F

    Partly Cloudy

  • Friday

    Friday: Sunny, with a high near 22. North northwest wind 3 to 7 mph.

    High: 22 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around -1. North northwest wind 5 to 7 mph becoming light and variable.

    Low: -1 °F

    Mostly Clear

  • Saturday

    Saturday: Mostly sunny, with a high near 24. South wind around 6 mph becoming west in the afternoon.

    High: 24 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 5.

    Low: 5 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 26.

    High: 26 °F

    Mostly Sunny

Detailed Forecast

Today
Sunny, with a high near 26. Southeast wind 3 to 5 mph.
Tonight
Mostly cloudy, with a low around 11. South wind 3 to 5 mph.
Thursday
Mostly sunny, with a high near 27. Light and variable wind.
Thursday Night
Partly cloudy, with a low around 7. North wind around 5 mph becoming calm in the evening.
Friday
Sunny, with a high near 22. North northwest wind 3 to 7 mph.
Friday Night
Mostly clear, with a low around -1. North northwest wind 5 to 7 mph becoming light and variable.
Saturday
Mostly sunny, with a high near 24. South wind around 6 mph becoming west in the afternoon.
Saturday Night
Partly cloudy, with a low around 5.
Sunday
Mostly sunny, with a high near 26.
Sunday Night
Mostly clear, with a low around 8.
Monday
Mostly sunny, with a high near 31.
Monday Night
Partly cloudy, with a low around 15.
Tuesday
Mostly sunny, with a high near 35.
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ABOUT THIS FORECAST

 
Point Forecast:
Mammoth WY
 44.98°N 110.69°W (Elev. 5745 ft)
8:47 am MST Jan 21, 2026
8am MST Jan 21, 2026-6pm MST Jan 27, 2026
 
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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