Lake-effect Snow and Whiteout Conditions in the Great Lakes Region; Below-average Temperatures in the East

Heavy lake-effect and lake-enhanced snow will persist downwind of the Great Lakes and produce some whiteout conditions that could cause difficult travel conditions. A coastal low will produce moderate to heavy snow over parts of southern and eastern New England into the afternoon. Below average temperatures are expected across the eastern U.S., particularly with chilly morning temperatures. Read More >

Current conditions at

Mammoth Yosemite Airport (KMMH)

Lat: 37.6241°NLon: 118.8423°WElev: 7112.0ft.

Clear

10°F

-12°C

Humidity 78%
Wind Speed NW 4 MPH
Barometer 30.32 in (1026.75 mb)
Dewpoint 5°F (-15°C)
Visibility 10.00 mi
Wind Chill3°F (-16°C)
Last update 20 Jan 03:15 AM PST
Extended Forecast for

4 Miles ENE Mammoth Lakes CA

  • Overnight

    Overnight: Mostly clear, with a low around 26. Calm wind.

    Low: 26 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 50. Calm wind.

    High: 50 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 29. Calm wind.

    Low: 29 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly cloudy, with a high near 50. Calm wind.

    High: 50 °F

    Mostly Cloudy

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 29. Calm wind.

    Low: 29 °F

    Mostly Cloudy

  • Thursday

    Thursday: A slight chance of snow after 10am, mixing with rain after 1pm.  Mostly cloudy, with a high near 42. Calm wind becoming northeast around 5 mph.  Chance of precipitation is 20%.

    High: 42 °F

    Slight Chance
    Snow then
    Slight Chance
    Rain/Snow

  • Thursday Night

    Thursday Night: Mostly cloudy, then gradually becoming mostly clear, with a low around 24.

    Low: 24 °F

    Decreasing
    Clouds

  • Friday

    Friday: Sunny, with a high near 44.

    High: 44 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 18.

    Low: 18 °F

    Mostly Clear

Detailed Forecast

Overnight
Mostly clear, with a low around 26. Calm wind.
Tuesday
Mostly sunny, with a high near 50. Calm wind.
Tuesday Night
Mostly cloudy, with a low around 29. Calm wind.
Wednesday
Mostly cloudy, with a high near 50. Calm wind.
Wednesday Night
Mostly cloudy, with a low around 29. Calm wind.
Thursday
A slight chance of snow after 10am, mixing with rain after 1pm. Mostly cloudy, with a high near 42. Calm wind becoming northeast around 5 mph. Chance of precipitation is 20%.
Thursday Night
Mostly cloudy, then gradually becoming mostly clear, with a low around 24.
Friday
Sunny, with a high near 44.
Friday Night
Mostly clear, with a low around 18.
Saturday
Sunny, with a high near 41.
Saturday Night
Mostly clear, with a low around 19.
Sunday
Mostly sunny, with a high near 46.
Sunday Night
Partly cloudy, with a low around 22.
Monday
Mostly sunny, with a high near 47.
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ABOUT THIS FORECAST

 
Point Forecast:
4 Miles ENE Mammoth Lakes CA
 37.67°N 118.89°W (Elev. 7671 ft)
1:15 am PST Jan 20, 2026
3am PST Jan 20, 2026-6pm PST Jan 26, 2026
 
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Additional Resources

Radar & Satellite Image

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Hourly Weather Forecast

National Digital Forecast Database