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

Mondell Field (KECS)

Lat: 43.89°NLon: 104.32°WElev: 4173ft.

Fair

81°F

27°C

Humidity 34%
Wind Speed NW 8 mph
Barometer 30.07 in
Dewpoint 50°F (10°C)
Visibility 10.00 mi
Heat Index80°F (27°C)
Last update 18 Sep 2:15 pm MDT
Extended Forecast for

Upton WY

  • This Afternoon

    This Afternoon: Sunny, with a high near 81. North wind 3 to 5 mph. Winds could gust as high as 15 mph.

    High: 81 °F

    Sunny

  • Tonight

    Tonight: A chance of showers and thunderstorms before 8pm, then showers likely and possibly a thunderstorm between 8pm and 3am, then a chance of showers and thunderstorms after 3am. Mostly cloudy, with a low around 55. Northeast wind around 5 mph becoming calm in the evening. Winds could gust as high as 16 mph. Chance of precipitation is 70%.

    Low: 55 °F

    Showers
    Likely

  • Saturday

    Saturday: Showers likely, with thunderstorms also possible after 9am. Cloudy, with a high near 70. Calm wind becoming southeast around 6 mph in the morning. Winds could gust as high as 17 mph. Chance of precipitation is 70%.

    High: 70 °F

    Showers
    Likely

  • Saturday Night

    Saturday Night: Showers likely and possibly a thunderstorm. Cloudy, with a low around 51. Calm wind becoming south around 6 mph in the evening. Winds could gust as high as 17 mph. Chance of precipitation is 70%.

    Low: 51 °F

    Showers
    Likely

  • Sunday

    Sunday: Showers and possibly a thunderstorm. High near 63. Southeast wind around 5 mph becoming northwest in the afternoon. Winds could gust as high as 16 mph. Chance of precipitation is 100%.

    High: 63 °F

    Showers

  • Sunday Night

    Sunday Night: Showers and possibly a thunderstorm. Low around 47. Northeast wind around 5 mph becoming calm in the evening. Winds could gust as high as 15 mph. Chance of precipitation is 80%.

    Low: 47 °F

    Showers then
    Chance
    Showers

  • Monday

    Monday: A 20 percent chance of showers after noon. Partly sunny, with a high near 66.

    High: 66 °F

    Mostly Cloudy
    then Slight
    Chance
    Showers

  • Monday Night

    Monday Night: Partly cloudy, with a low around 47.

    Low: 47 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 74.

    High: 74 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
Sunny, with a high near 81. North wind 3 to 5 mph. Winds could gust as high as 15 mph.
Tonight
A chance of showers and thunderstorms before 8pm, then showers likely and possibly a thunderstorm between 8pm and 3am, then a chance of showers and thunderstorms after 3am. Mostly cloudy, with a low around 55. Northeast wind around 5 mph becoming calm in the evening. Winds could gust as high as 16 mph. Chance of precipitation is 70%.
Saturday
Showers likely, with thunderstorms also possible after 9am. Cloudy, with a high near 70. Calm wind becoming southeast around 6 mph in the morning. Winds could gust as high as 17 mph. Chance of precipitation is 70%.
Saturday Night
Showers likely and possibly a thunderstorm. Cloudy, with a low around 51. Calm wind becoming south around 6 mph in the evening. Winds could gust as high as 17 mph. Chance of precipitation is 70%.
Sunday
Showers and possibly a thunderstorm. High near 63. Southeast wind around 5 mph becoming northwest in the afternoon. Winds could gust as high as 16 mph. Chance of precipitation is 100%.
Sunday Night
Showers and possibly a thunderstorm. Low around 47. Northeast wind around 5 mph becoming calm in the evening. Winds could gust as high as 15 mph. Chance of precipitation is 80%.
Monday
A 20 percent chance of showers after noon. Partly sunny, with a high near 66.
Monday Night
Partly cloudy, with a low around 47.
Tuesday
Mostly sunny, with a high near 74.
Tuesday Night
Partly cloudy, with a low around 51.
Wednesday
Mostly sunny, with a high near 78.
Wednesday Night
Mostly clear, with a low around 51.
Thursday
Sunny, with a high near 79.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Upton WY
 44.1°N 104.62°W (Elev. 4262 ft)
Last Update:
12:41 pm MDT Sep 18, 2026
Forecast Valid:
2pm MDT Sep 18, 2026-6pm MDT Sep 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