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

Areas of Dangerous Heat and Heavy Rain with Possible Flooding into this Weekend

Hot temperatures and high humidity are forecast to continue across the mid-Mississippi Valley into this weekend with heat advisories in effect. Heavy to excessive rainfall occurring at times through Sunday could bring areas of flooding to parts of the upper Midwest, central Great Lakes, southern New England and Virginia/North Carolina tidewater region. Read More >

Current conditions at

Riverton Regional Airport (KRIW)

Lat: 43.06219°NLon: 108.44701°WElev: 5443.0ft.

Clear

54°F

12°C

Humidity 76%
Wind Speed NNW 3 MPH
Barometer 30.18 in (1022.01 mb)
Dewpoint 46°F (8°C)
Visibility 10.00 mi
Last update 18 Sep 03:00 AM MDT
Extended Forecast for

Riverton WY

  • Overnight

    Overnight: Partly cloudy, with a low around 50. West wind 3 to 5 mph.

    Low: 50 °F

    Partly Cloudy

  • Friday

    Friday: A 40 percent chance of showers and thunderstorms, mainly after 4pm. Patchy fog between 7am and 8am. Otherwise, mostly sunny, with a high near 79. Calm wind becoming west southwest 5 to 9 mph in the afternoon.

    High: 79 °F

    Patchy Fog
    then Chance
    Showers

  • Friday Night

    Friday Night: Showers and thunderstorms likely before 4am, then a slight chance of showers and thunderstorms after 5am. Patchy fog after 5am. Otherwise, mostly cloudy, with a low around 51. South wind 5 to 10 mph becoming light and variable after midnight. Chance of precipitation is 70%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 51 °F

    Showers
    Likely then
    Chance
    Showers and
    Patchy Fog

  • Saturday

    Saturday: A 50 percent chance of showers and thunderstorms, mainly between noon and 4pm. Mostly sunny, with a high near 70. Light and variable wind becoming north northeast 5 to 9 mph in the afternoon.

    High: 70 °F

    Chance
    Showers

  • Saturday Night

    Saturday Night: Showers and possibly a thunderstorm. Low around 47. North wind 5 to 10 mph becoming light west northwest after midnight. Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 47 °F

    Showers

  • Sunday

    Sunday: A chance of showers, with thunderstorms also possible after noon. Partly sunny, with a high near 64. Light and variable wind becoming north northeast 5 to 7 mph in the afternoon. Chance of precipitation is 40%.

    High: 64 °F

    Chance
    Showers then
    Slight Chance
    T-storms

  • Sunday Night

    Sunday Night: A 10 percent chance of showers and thunderstorms before 9pm. Partly cloudy, with a low around 45. North northeast wind 5 to 7 mph becoming calm in the evening.

    Low: 45 °F

    Slight Chance
    T-storms then
    Partly Cloudy

  • Monday

    Monday: Sunny, with a high near 71.

    High: 71 °F

    Sunny

  • Monday Night

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

    Low: 46 °F

    Mostly Clear

Detailed Forecast

Overnight
Partly cloudy, with a low around 50. West wind 3 to 5 mph.
Friday
A 40 percent chance of showers and thunderstorms, mainly after 4pm. Patchy fog between 7am and 8am. Otherwise, mostly sunny, with a high near 79. Calm wind becoming west southwest 5 to 9 mph in the afternoon.
Friday Night
Showers and thunderstorms likely before 4am, then a slight chance of showers and thunderstorms after 5am. Patchy fog after 5am. Otherwise, mostly cloudy, with a low around 51. South wind 5 to 10 mph becoming light and variable after midnight. Chance of precipitation is 70%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Saturday
A 50 percent chance of showers and thunderstorms, mainly between noon and 4pm. Mostly sunny, with a high near 70. Light and variable wind becoming north northeast 5 to 9 mph in the afternoon.
Saturday Night
Showers and possibly a thunderstorm. Low around 47. North wind 5 to 10 mph becoming light west northwest after midnight. Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Sunday
A chance of showers, with thunderstorms also possible after noon. Partly sunny, with a high near 64. Light and variable wind becoming north northeast 5 to 7 mph in the afternoon. Chance of precipitation is 40%.
Sunday Night
A 10 percent chance of showers and thunderstorms before 9pm. Partly cloudy, with a low around 45. North northeast wind 5 to 7 mph becoming calm in the evening.
Monday
Sunny, with a high near 71.
Monday Night
Mostly clear, with a low around 46.
Tuesday
Mostly sunny, with a high near 76.
Tuesday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 48.
Wednesday
Sunny, with a high near 77.
Wednesday Night
Mostly clear, with a low around 47.
Thursday
Sunny, with a high near 80.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Riverton WY
 43.04°N 108.41°W (Elev. 5046 ft)
Last Update:
2:48 am MDT Sep 18, 2026
Forecast Valid:
3am MDT Sep 18, 2026-6pm MDT Sep 24, 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