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

Tropical Storm Arthur and Heavy Rainfall in the South; Severe Weather in the Midwest

An outbreak of severe thunderstorms is expected across portions of Illinois and Indiana tonight. Intense tornadoes, swaths of damaging gusts, and hail in excess of 2 inches in diameter possible. Tropical Storm Arthur will continue to produce strong winds across coastal Upper Texas and Louisiana tonight, as well as potentially life-threatening flooding across southern Louisiana into Mississippi. Read More >

Current conditions at

Casper, Natrona County International Airport (KCPR)

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

Mostly Cloudy

63°F

17°C

Humidity 29%
Wind Speed NNE 20 MPH
Barometer 29.97 in (1014.9 mb)
Dewpoint 30°F (-1°C)
Visibility 10.00 mi
Last update 17 Jun 08:35 PM MDT
Extended Forecast for

Bar Nunn WY

  • Tonight

    Tonight: Partly cloudy, with a low around 45. Breezy, with a north northeast wind 17 to 22 mph becoming light after midnight. Winds could gust as high as 33 mph.

    Low: 45 °F

    Mostly Clear
    and Breezy
    then Partly
    Cloudy

  • Thursday

    Thursday: Sunny, with a high near 82. Light north northwest wind becoming west northwest 6 to 11 mph in the afternoon. Winds could gust as high as 21 mph.

    High: 82 °F

    Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 47. Breezy, with a northeast wind 13 to 18 mph becoming north northeast 7 to 12 mph after midnight. Winds could gust as high as 26 mph.

    Low: 47 °F

    Partly Cloudy
    and Breezy
    then Partly
    Cloudy

  • Juneteenth

    Juneteenth: Sunny, with a high near 85. North wind 6 to 9 mph becoming east in the morning.

    High: 85 °F

    Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 53. Breezy, with an east wind 15 to 20 mph decreasing to 5 to 10 mph after midnight. Winds could gust as high as 30 mph.

    Low: 53 °F

    Partly Cloudy
    and Breezy

  • Saturday

    Saturday: A 50 percent chance of showers and thunderstorms after noon. Mostly sunny, with a high near 89. Breezy, with a light and variable wind becoming west northwest 17 to 22 mph in the morning. Winds could gust as high as 33 mph.

    High: 89 °F

    Partly Sunny
    then Chance
    T-storms and
    Breezy

  • Saturday Night

    Saturday Night: A 40 percent chance of showers and thunderstorms, mainly before midnight. Partly cloudy, with a low around 49. Breezy, with a west northwest wind 5 to 15 mph, with gusts as high as 24 mph.

    Low: 49 °F

    Chance
    T-storms and
    Breezy then
    Slight Chance
    T-storms

  • Sunday

    Sunday: A 40 percent chance of showers and thunderstorms, mainly after noon. Mostly sunny, with a high near 78.

    High: 78 °F

    Chance
    T-storms

  • Sunday Night

    Sunday Night: A 10 percent chance of showers and thunderstorms before midnight. Partly cloudy, with a low around 47.

    Low: 47 °F

    Slight Chance
    T-storms then
    Partly Cloudy

Detailed Forecast

Tonight
Partly cloudy, with a low around 45. Breezy, with a north northeast wind 17 to 22 mph becoming light after midnight. Winds could gust as high as 33 mph.
Thursday
Sunny, with a high near 82. Light north northwest wind becoming west northwest 6 to 11 mph in the afternoon. Winds could gust as high as 21 mph.
Thursday Night
Partly cloudy, with a low around 47. Breezy, with a northeast wind 13 to 18 mph becoming north northeast 7 to 12 mph after midnight. Winds could gust as high as 26 mph.
Juneteenth
Sunny, with a high near 85. North wind 6 to 9 mph becoming east in the morning.
Friday Night
Partly cloudy, with a low around 53. Breezy, with an east wind 15 to 20 mph decreasing to 5 to 10 mph after midnight. Winds could gust as high as 30 mph.
Saturday
A 50 percent chance of showers and thunderstorms after noon. Mostly sunny, with a high near 89. Breezy, with a light and variable wind becoming west northwest 17 to 22 mph in the morning. Winds could gust as high as 33 mph.
Saturday Night
A 40 percent chance of showers and thunderstorms, mainly before midnight. Partly cloudy, with a low around 49. Breezy, with a west northwest wind 5 to 15 mph, with gusts as high as 24 mph.
Sunday
A 40 percent chance of showers and thunderstorms, mainly after noon. Mostly sunny, with a high near 78.
Sunday Night
A 10 percent chance of showers and thunderstorms before midnight. Partly cloudy, with a low around 47.
Monday
A 20 percent chance of showers and thunderstorms after noon. Mostly sunny, with a high near 79.
Monday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 48.
Tuesday
Sunny, with a high near 83.
Tuesday Night
Mostly clear, with a low around 50.
Wednesday
Sunny, with a high near 88.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Bar Nunn WY
 42.92°N 106.35°W (Elev. 5322 ft)
Last Update:
8:47 pm MDT Jun 17, 2026
Forecast Valid:
8pm MDT Jun 17, 2026-6pm MDT Jun 24, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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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