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

Atmospheric River Bringing Heavy Rain to Southern California and Heavy Snow to the Sierra Nevadas

A strong atmospheric river will continue heavy rain over southern California through Friday. The heaviest rainfall is ongoing today in the Los Angeles Basin. Flash and urban flooding is possible. A prolonged heavy snowfall has begun over the Sierra Nevada Mountains and will continue through Friday. Travel will become increasingly difficult over the passes due to snow and strong winds. Read More >

Hazardous Weather Conditions

Current conditions at

South Big Horn County Airport (KGEY)

Lat: 44.5174°NLon: 108.0752°WElev: 3934.0ft.

Clear

30°F

-1°C

Humidity 84%
Wind Speed SSW 4 MPH
Barometer 29.8 in (1009.14 mb)
Dewpoint 26°F (-3°C)
Visibility 10.00 mi
Wind Chill26°F (-3°C)
Last update 26 Dec 01:53 AM MST
Extended Forecast for

Greybull/S Big Horn Airport WY

  • Overnight

    Overnight: Mostly clear, with a low around 30. South southeast wind around 10 mph.

    Low: 30 °F

    Mostly Clear

  • Friday

    Friday: A slight chance of rain between 3pm and 4pm. Mostly sunny, with a high near 53. Windy, with a south southeast wind 11 to 16 mph increasing to 20 to 25 mph. Winds could gust as high as 36 mph. Chance of precipitation is 20%.

    High: 53 °F

    Mostly Sunny
    and Breezy
    then Slight
    Chance Rain
    and Windy

  • Friday Night

    Friday Night: A 20 percent chance of rain before 8pm. Mostly cloudy, with a low around 27. South southwest wind 7 to 13 mph becoming southeast in the evening.

    Low: 27 °F

    Slight Chance
    Rain then
    Partly Cloudy

  • Saturday

    Saturday: A 20 percent chance of snow after 11am. Mostly sunny, with a high near 42. Breezy, with a southeast wind 7 to 17 mph becoming northwest in the afternoon. Winds could gust as high as 28 mph.

    High: 42 °F

    Slight Chance
    Snow and
    Breezy

  • Saturday Night

    Saturday Night: A 30 percent chance of snow before 11pm. Mostly cloudy, with a low around 9. Blustery, with a northwest wind 11 to 18 mph, with gusts as high as 32 mph.

    Low: 9 °F

    Blustery.
    Chance Snow
    then Partly
    Cloudy

  • Sunday

    Sunday: Sunny, with a high near 27. Northwest wind 5 to 7 mph becoming light and variable in the afternoon.

    High: 27 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 8. Southeast wind 3 to 5 mph.

    Low: 8 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 32.

    High: 32 °F

    Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 13.

    Low: 13 °F

    Partly Cloudy

Detailed Forecast

Overnight
Mostly clear, with a low around 30. South southeast wind around 10 mph.
Friday
A slight chance of rain between 3pm and 4pm. Mostly sunny, with a high near 53. Windy, with a south southeast wind 11 to 16 mph increasing to 20 to 25 mph. Winds could gust as high as 36 mph. Chance of precipitation is 20%.
Friday Night
A 20 percent chance of rain before 8pm. Mostly cloudy, with a low around 27. South southwest wind 7 to 13 mph becoming southeast in the evening.
Saturday
A 20 percent chance of snow after 11am. Mostly sunny, with a high near 42. Breezy, with a southeast wind 7 to 17 mph becoming northwest in the afternoon. Winds could gust as high as 28 mph.
Saturday Night
A 30 percent chance of snow before 11pm. Mostly cloudy, with a low around 9. Blustery, with a northwest wind 11 to 18 mph, with gusts as high as 32 mph.
Sunday
Sunny, with a high near 27. Northwest wind 5 to 7 mph becoming light and variable in the afternoon.
Sunday Night
Mostly clear, with a low around 8. Southeast wind 3 to 5 mph.
Monday
Sunny, with a high near 32.
Monday Night
Partly cloudy, with a low around 13.
Tuesday
Partly sunny, with a high near 39.
Tuesday Night
Mostly cloudy, with a low around 18.
Wednesday
Mostly sunny, with a high near 42.
Wednesday Night
Mostly cloudy, with a low around 19.
New Year's Day
Partly sunny, with a high near 40.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Greybull/S Big Horn Airport WY
 44.51°N 108.07°W (Elev. 3799 ft)
Last Update:
1:48 am MST Dec 26, 2025
Forecast Valid:
2am MST Dec 26, 2025-6pm MST Jan 1, 2026
 
Forecast Discussion
 
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