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

Mondell Field (KECS)

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

Fair

59°F

15°C

Humidity 72%
Wind Speed Calm
Barometer 30.24 in
Dewpoint 50°F (10°C)
Visibility 10.00 mi
Last update 17 Aug 12:55 am MDT
Extended Forecast for

Newcastle WY

  • Overnight

    Overnight: Mostly clear, with a steady temperature around 61. Northeast wind 3 to 5 mph.

    Low: 61 °F

    Mostly Clear

  • Monday

    Monday: A 20 percent chance of showers and thunderstorms after noon. Sunny, with a high near 85. Calm wind becoming west around 6 mph in the afternoon. Winds could gust as high as 18 mph.

    High: 85 °F

    Sunny then
    Slight Chance
    T-storms

  • Monday Night

    Monday Night: A 30 percent chance of showers and thunderstorms before midnight. Partly cloudy, with a low around 57. North wind around 6 mph becoming calm in the evening. Winds could gust as high as 16 mph.

    Low: 57 °F

    Chance
    T-storms then
    Partly Cloudy

  • Tuesday

    Tuesday: A 20 percent chance of showers and thunderstorms after noon. Partly sunny, with a high near 80. Calm wind becoming west 5 to 7 mph in the afternoon. Winds could gust as high as 17 mph.

    High: 80 °F

    Partly Sunny
    then Slight
    Chance
    T-storms

  • Tuesday Night

    Tuesday Night: Showers and thunderstorms likely, mainly before midnight. Mostly cloudy, with a low around 55. North wind around 6 mph becoming calm after midnight. Winds could gust as high as 16 mph. Chance of precipitation is 60%.

    Low: 55 °F

    T-storms
    Likely

  • Wednesday

    Wednesday: A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 78. Calm wind becoming west around 6 mph in the afternoon. Winds could gust as high as 18 mph.

    High: 78 °F

    Slight Chance
    T-storms

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 55.

    Low: 55 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 86.

    High: 86 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 59.

    Low: 59 °F

    Mostly Clear

Detailed Forecast

Overnight
Mostly clear, with a steady temperature around 61. Northeast wind 3 to 5 mph.
Monday
A 20 percent chance of showers and thunderstorms after noon. Sunny, with a high near 85. Calm wind becoming west around 6 mph in the afternoon. Winds could gust as high as 18 mph.
Monday Night
A 30 percent chance of showers and thunderstorms before midnight. Partly cloudy, with a low around 57. North wind around 6 mph becoming calm in the evening. Winds could gust as high as 16 mph.
Tuesday
A 20 percent chance of showers and thunderstorms after noon. Partly sunny, with a high near 80. Calm wind becoming west 5 to 7 mph in the afternoon. Winds could gust as high as 17 mph.
Tuesday Night
Showers and thunderstorms likely, mainly before midnight. Mostly cloudy, with a low around 55. North wind around 6 mph becoming calm after midnight. Winds could gust as high as 16 mph. Chance of precipitation is 60%.
Wednesday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 78. Calm wind becoming west around 6 mph in the afternoon. Winds could gust as high as 18 mph.
Wednesday Night
Mostly clear, with a low around 55.
Thursday
Sunny, with a high near 86.
Thursday Night
Mostly clear, with a low around 59.
Friday
Mostly sunny, with a high near 88.
Friday Night
Mostly clear, with a low around 62.
Saturday
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 87.
Saturday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 63.
Sunday
Mostly sunny, with a high near 88.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Newcastle WY
 43.86°N 104.21°W (Elev. 4380 ft)
Last Update:
12:31 am MDT Aug 17, 2026
Forecast Valid:
1am MDT Aug 17, 2026-6pm MDT Aug 23, 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