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 51%
Wind Speed Calm
Barometer 30.13 in
Dewpoint 41°F (5°C)
Visibility 10.00 mi
Last update 18 Aug 2:35 am MDT
Extended Forecast for

Newcastle WY

  • Overnight

    Overnight: A 20 percent chance of showers. Partly cloudy, with a low around 57. North wind 3 to 5 mph.

    Low: 57 °F

    Slight Chance
    Showers

  • Tuesday

    Tuesday: A 30 percent chance of showers and thunderstorms after noon. Mostly cloudy, with a high near 81. Calm wind becoming west around 5 mph. Winds could gust as high as 17 mph.

    High: 81 °F

    Mostly Cloudy
    then Chance
    T-storms

  • Tuesday Night

    Tuesday Night: A 40 percent chance of showers and thunderstorms, mainly before midnight. Mostly cloudy, with a low around 55. Light and variable wind. Winds could gust as high as 16 mph.

    Low: 55 °F

    Chance
    T-storms

  • Wednesday

    Wednesday: Mostly sunny, with a high near 84. Calm wind becoming northwest 5 to 8 mph in the afternoon. Winds could gust as high as 21 mph.

    High: 84 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 57. Northwest wind 5 to 7 mph becoming light and variable after midnight. Winds could gust as high as 21 mph.

    Low: 57 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 90. Calm wind becoming west around 5 mph.

    High: 90 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 61.

    Low: 61 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 90.

    High: 90 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 63.

    Low: 63 °F

    Mostly Clear

Detailed Forecast

Overnight
A 20 percent chance of showers. Partly cloudy, with a low around 57. North wind 3 to 5 mph.
Tuesday
A 30 percent chance of showers and thunderstorms after noon. Mostly cloudy, with a high near 81. Calm wind becoming west around 5 mph. Winds could gust as high as 17 mph.
Tuesday Night
A 40 percent chance of showers and thunderstorms, mainly before midnight. Mostly cloudy, with a low around 55. Light and variable wind. Winds could gust as high as 16 mph.
Wednesday
Mostly sunny, with a high near 84. Calm wind becoming northwest 5 to 8 mph in the afternoon. Winds could gust as high as 21 mph.
Wednesday Night
Mostly clear, with a low around 57. Northwest wind 5 to 7 mph becoming light and variable after midnight. Winds could gust as high as 21 mph.
Thursday
Sunny, with a high near 90. Calm wind becoming west around 5 mph.
Thursday Night
Mostly clear, with a low around 61.
Friday
Sunny, with a high near 90.
Friday Night
Mostly clear, with a low around 63.
Saturday
A slight chance of showers and thunderstorms after noon. Mostly sunny, with a high near 88.
Saturday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 63.
Sunday
Mostly sunny, with a high near 90.
Sunday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 62.
Monday
A chance of showers and thunderstorms. Mostly sunny, with a high near 87.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Newcastle WY
 43.86°N 104.21°W (Elev. 4380 ft)
Last Update:
1:21 am MDT Aug 18, 2026
Forecast Valid:
2am MDT Aug 18, 2026-6pm MDT Aug 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