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

21°F

-6°C

Humidity 80%
Wind Speed SE 7 mph
Barometer 30.00 in
Dewpoint 16°F (-9°C)
Visibility 10.00 mi
Wind Chill12°F (-11°C)
Last update 7 Dec 11:35 pm MST
Extended Forecast for

Newcastle WY

  • Tonight

    Tonight: Mostly cloudy, with a temperature rising to around 27 by 4am. Light and variable wind.

    Low: 23 °F⇑

    Mostly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 42. Wind chill values as low as 20. Northwest wind 5 to 11 mph, with gusts as high as 22 mph.

    High: 42 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 27. North wind 6 to 13 mph becoming south in the evening.

    Low: 27 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: A chance of rain after 11am, mixing with snow after 4pm. Mostly cloudy, with a high near 49. Breezy, with a west wind 15 to 20 mph increasing to 23 to 28 mph in the afternoon. Winds could gust as high as 38 mph. Chance of precipitation is 30%.

    High: 49 °F

    Breezy.
    Chance Rain
    then Chance
    Rain/Snow

  • Tuesday Night

    Tuesday Night: A 30 percent chance of snow. Mostly cloudy, with a low around 25. Blustery, with a northwest wind 18 to 23 mph decreasing to 9 to 14 mph after midnight. Winds could gust as high as 34 mph.

    Low: 25 °F

    Chance Snow
    and Blustery

  • Wednesday

    Wednesday: Snow likely before noon, then rain and snow likely between noon and 3pm, then rain likely after 3pm. Mostly cloudy, with a high near 39. South wind 8 to 16 mph, with gusts as high as 22 mph. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.

    High: 39 °F

    Snow Likely
    then
    Rain/Snow
    Likely

  • Wednesday Night

    Wednesday Night: Rain likely before midnight, then a chance of rain and snow between midnight and 3am, then a chance of snow after 3am. Mostly cloudy, with a low around 23. Northwest wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 70%.

    Low: 23 °F

    Rain Likely
    then Chance
    Rain/Snow

  • Thursday

    Thursday: A chance of snow. Partly sunny, with a high near 31. Northwest wind 11 to 13 mph, with gusts as high as 22 mph.

    High: 31 °F

    Chance Snow

  • Thursday Night

    Thursday Night: A chance of snow. Mostly cloudy, with a low around 9.

    Low: 9 °F

    Chance Snow

Detailed Forecast

Tonight
Mostly cloudy, with a temperature rising to around 27 by 4am. Light and variable wind.
Monday
Mostly sunny, with a high near 42. Wind chill values as low as 20. Northwest wind 5 to 11 mph, with gusts as high as 22 mph.
Monday Night
Mostly cloudy, with a low around 27. North wind 6 to 13 mph becoming south in the evening.
Tuesday
A chance of rain after 11am, mixing with snow after 4pm. Mostly cloudy, with a high near 49. Breezy, with a west wind 15 to 20 mph increasing to 23 to 28 mph in the afternoon. Winds could gust as high as 38 mph. Chance of precipitation is 30%.
Tuesday Night
A 30 percent chance of snow. Mostly cloudy, with a low around 25. Blustery, with a northwest wind 18 to 23 mph decreasing to 9 to 14 mph after midnight. Winds could gust as high as 34 mph.
Wednesday
Snow likely before noon, then rain and snow likely between noon and 3pm, then rain likely after 3pm. Mostly cloudy, with a high near 39. South wind 8 to 16 mph, with gusts as high as 22 mph. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.
Wednesday Night
Rain likely before midnight, then a chance of rain and snow between midnight and 3am, then a chance of snow after 3am. Mostly cloudy, with a low around 23. Northwest wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 70%.
Thursday
A chance of snow. Partly sunny, with a high near 31. Northwest wind 11 to 13 mph, with gusts as high as 22 mph.
Thursday Night
A chance of snow. Mostly cloudy, with a low around 9.
Friday
A chance of snow, mainly before 11am. Mostly cloudy, with a high near 21.
Friday Night
A slight chance of snow. Mostly cloudy, with a low around 10.
Saturday
Partly sunny, with a high near 35.
Saturday Night
Partly cloudy, with a low around 17.
Sunday
Mostly sunny, with a high near 42.
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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:
9:42 pm MST Dec 7, 2025
Forecast Valid:
11pm MST Dec 7, 2025-6pm MST Dec 14, 2025
 
Forecast Discussion
 
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Additional Resources

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Chance of Precipitation