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

Dangerous Heat and Heavy Rainfall into the Weekend

Hot temperatures and high humidity are forecast to continue across the mid-Mississippi Valley into this weekend. Heat Advisories remain in effect. Heavy to excessive rainfall occurring at times through the weekend could bring areas of flooding to parts of the northern Rockies, upper Midwest, central Great Lakes, and southern New England. Read More >

Hazardous Weather Conditions

Current conditions at

South Big Horn County Airport (KGEY)

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

Overcast

59°F

15°C

Humidity 87%
Wind Speed NNE 3 MPH
Barometer 30.08 in (1018.63 mb)
Dewpoint 55°F (13°C)
Visibility 10.00 mi
Last update 18 Sep 10:00 PM MDT
Extended Forecast for

Greybull WY

  • Tonight

    Tonight: Isolated showers and thunderstorms between midnight and 3am. Mostly cloudy, with a low around 55. North wind 5 to 9 mph becoming west in the evening. Chance of precipitation is 10%.

    Low: 55 °F

    Mostly Cloudy
    then Isolated
    T-storms

  • Saturday

    Saturday: Scattered showers and thunderstorms, mainly after 2pm. Patchy fog before 10am. Otherwise, partly sunny, with a high near 69. Breezy, with a light west northwest wind becoming northwest 11 to 16 mph in the afternoon. Winds could gust as high as 26 mph. Chance of precipitation is 50%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 69 °F

    Scattered
    T-storms and
    Patchy Fog

  • Saturday Night

    Saturday Night: Scattered showers and thunderstorms. Mostly cloudy, with a low around 46. Breezy, with a northwest wind 13 to 18 mph decreasing to 6 to 11 mph after midnight. Winds could gust as high as 30 mph. Chance of precipitation is 50%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 46 °F

    Chance
    Showers and
    Breezy

  • Sunday

    Sunday: A chance of showers, with thunderstorms also possible after noon. Mostly cloudy, with a high near 66. Northwest wind 3 to 7 mph. Chance of precipitation is 50%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 66 °F

    Chance
    Showers then
    Slight Chance
    T-storms

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 44. North northwest wind 5 to 7 mph becoming calm in the evening.

    Low: 44 °F

    Mostly Cloudy

  • Monday

    Monday: Sunny, with a high near 74. Light south southeast wind.

    High: 74 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 46. Calm wind.

    Low: 46 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 79.

    High: 79 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: A 10 percent chance of showers and thunderstorms after midnight. Partly cloudy, with a low around 49.

    Low: 49 °F

    Mostly Clear
    then Slight
    Chance
    T-storms

Detailed Forecast

Tonight
Isolated showers and thunderstorms between midnight and 3am. Mostly cloudy, with a low around 55. North wind 5 to 9 mph becoming west in the evening. Chance of precipitation is 10%.
Saturday
Scattered showers and thunderstorms, mainly after 2pm. Patchy fog before 10am. Otherwise, partly sunny, with a high near 69. Breezy, with a light west northwest wind becoming northwest 11 to 16 mph in the afternoon. Winds could gust as high as 26 mph. Chance of precipitation is 50%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Saturday Night
Scattered showers and thunderstorms. Mostly cloudy, with a low around 46. Breezy, with a northwest wind 13 to 18 mph decreasing to 6 to 11 mph after midnight. Winds could gust as high as 30 mph. Chance of precipitation is 50%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Sunday
A chance of showers, with thunderstorms also possible after noon. Mostly cloudy, with a high near 66. Northwest wind 3 to 7 mph. Chance of precipitation is 50%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Sunday Night
Mostly cloudy, with a low around 44. North northwest wind 5 to 7 mph becoming calm in the evening.
Monday
Sunny, with a high near 74. Light south southeast wind.
Monday Night
Mostly clear, with a low around 46. Calm wind.
Tuesday
Mostly sunny, with a high near 79.
Tuesday Night
A 10 percent chance of showers and thunderstorms after midnight. Partly cloudy, with a low around 49.
Wednesday
Mostly sunny, with a high near 80.
Wednesday Night
Mostly clear, with a low around 49.
Thursday
Sunny, with a high near 82.
Thursday Night
Partly cloudy, with a low around 50.
Friday
Mostly sunny, with a high near 83.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Greybull WY
 44.49°N 108.07°W (Elev. 3894 ft)
Last Update:
9:33 pm MDT Sep 18, 2026
Forecast Valid:
10pm MDT Sep 18, 2026-6pm MDT Sep 25, 2026
 
Forecast Discussion
 
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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

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation