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 >

Current conditions at

Casper, Natrona County International Airport (KCPR)

Lat: 42.8975°NLon: 106.47306°WElev: 5348.0ft.

Clear

57°F

14°C

Humidity 76%
Wind Speed WNW 4 MPH
Barometer 30.2 in (1022.69 mb)
Dewpoint 50°F (10°C)
Visibility 10.00 mi
Last update 18 Sep 06:35 AM MDT
Extended Forecast for

Powder River WY

  • Today

    Today: A slight chance of showers between 1pm and 3pm, then a slight chance of showers and thunderstorms after 3pm. Mostly sunny, with a high near 79. West southwest wind 8 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 20%.

    High: 79 °F

    Sunny then
    Slight Chance
    T-storms

  • Tonight

    Tonight: Showers and thunderstorms before 4am, then a slight chance of showers after 5am. Patchy fog before 3am, then patchy fog after 4am. Low around 49. South wind 3 to 8 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 49 °F

    Showers then
    Chance
    Showers and
    Patchy Fog

  • Saturday

    Saturday: A 40 percent chance of showers and thunderstorms, mainly before 3pm. Partly sunny, with a high near 70. Light southwest wind becoming west southwest 5 to 10 mph in the morning. Winds could gust as high as 23 mph.

    High: 70 °F

    Partly Sunny
    then Chance
    Showers

  • Saturday Night

    Saturday Night: Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 46. West wind 5 to 11 mph becoming north in the evening. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 46 °F

    Showers
    Likely

  • Sunday

    Sunday: Showers likely, with thunderstorms also possible after noon. Partly sunny, with a high near 63. West wind 11 to 14 mph, with gusts as high as 26 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 63 °F

    Showers
    Likely

  • Sunday Night

    Sunday Night: A slight chance of showers and thunderstorms before 9pm, then a slight chance of showers between 9pm and midnight. Partly cloudy, with a low around 42. Northwest wind 6 to 11 mph becoming light and variable. Winds could gust as high as 21 mph. Chance of precipitation is 20%.

    Low: 42 °F

    Slight Chance
    T-storms then
    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 70. Southwest wind around 6 mph becoming east southeast in the afternoon.

    High: 70 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 43.

    Low: 43 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 77.

    High: 77 °F

    Mostly Sunny

Detailed Forecast

Today
A slight chance of showers between 1pm and 3pm, then a slight chance of showers and thunderstorms after 3pm. Mostly sunny, with a high near 79. West southwest wind 8 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 20%.
Tonight
Showers and thunderstorms before 4am, then a slight chance of showers after 5am. Patchy fog before 3am, then patchy fog after 4am. Low around 49. South wind 3 to 8 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Saturday
A 40 percent chance of showers and thunderstorms, mainly before 3pm. Partly sunny, with a high near 70. Light southwest wind becoming west southwest 5 to 10 mph in the morning. Winds could gust as high as 23 mph.
Saturday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 46. West wind 5 to 11 mph becoming north in the evening. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Sunday
Showers likely, with thunderstorms also possible after noon. Partly sunny, with a high near 63. West wind 11 to 14 mph, with gusts as high as 26 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Sunday Night
A slight chance of showers and thunderstorms before 9pm, then a slight chance of showers between 9pm and midnight. Partly cloudy, with a low around 42. Northwest wind 6 to 11 mph becoming light and variable. Winds could gust as high as 21 mph. Chance of precipitation is 20%.
Monday
Mostly sunny, with a high near 70. Southwest wind around 6 mph becoming east southeast in the afternoon.
Monday Night
Mostly clear, with a low around 43.
Tuesday
Mostly sunny, with a high near 77.
Tuesday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 47. Chance of precipitation is 30%.
Wednesday
Sunny, with a high near 77.
Wednesday Night
Mostly clear, with a low around 46.
Thursday
Sunny, with a high near 79.
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ABOUT THIS FORECAST

 
Point Forecast:
Powder River WY
 43.03°N 106.98°W (Elev. 5778 ft)
Last Update:
6:32 am MDT Sep 18, 2026
Forecast Valid:
7am MDT Sep 18, 2026-6pm MDT Sep 24, 2026
 
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Additional Resources

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Chance of Precipitation