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

Heavy Rainfall for Portions of the West and Central U.S.; Monitoring Fire Weather Conditions for New England

Tropical moisture continues to flow across portions of the Great Basin, desert Southwest and California. Isolated instances of flash flooding remains possible. Meanwhile, a storm and associated frontal boundary will focus showers and thunderstorms for the center of the nation. For New England, dry and breezy conditions could enhance favorable fire weather conditions. Read More >

Current conditions at

Mondell Field (KECS)

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

Fair

46°F

8°C

Humidity 82%
Wind Speed Calm
Barometer 30.09 in
Dewpoint 41°F (5°C)
Visibility 10.00 mi
Last update 20 Sep 6:35 am MDT
Extended Forecast for

Newcastle WY

  • Today

    Today: Partly sunny, with a high near 77. Calm wind becoming west around 5 mph.

    High: 77 °F

    Partly Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 48. West wind around 5 mph becoming calm.

    Low: 48 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 81. Calm wind becoming southwest around 5 mph.

    High: 81 °F

    Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 53. South wind around 5 mph becoming northeast after midnight.

    Low: 53 °F

    Partly Cloudy

  • Monday

    Monday: A chance of showers, with thunderstorms also possible after noon. Partly sunny, with a high near 68. North wind 5 to 10 mph increasing to 10 to 15 mph in the afternoon. Winds could gust as high as 25 mph. Chance of precipitation is 40%.

    High: 68 °F

    Chance
    Showers

  • Monday Night

    Monday Night: A 40 percent chance of showers. Mostly cloudy, with a low around 46. North wind 10 to 15 mph, with gusts as high as 25 mph.

    Low: 46 °F

    Chance
    Showers

  • Tuesday

    Tuesday: Mostly sunny, with a high near 69. North wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 69 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 45. North wind around 5 mph becoming calm in the evening.

    Low: 45 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 72.

    High: 72 °F

    Sunny

Detailed Forecast

Today
Partly sunny, with a high near 77. Calm wind becoming west around 5 mph.
Tonight
Mostly clear, with a low around 48. West wind around 5 mph becoming calm.
Sunday
Sunny, with a high near 81. Calm wind becoming southwest around 5 mph.
Sunday Night
Partly cloudy, with a low around 53. South wind around 5 mph becoming northeast after midnight.
Monday
A chance of showers, with thunderstorms also possible after noon. Partly sunny, with a high near 68. North wind 5 to 10 mph increasing to 10 to 15 mph in the afternoon. Winds could gust as high as 25 mph. Chance of precipitation is 40%.
Monday Night
A 40 percent chance of showers. Mostly cloudy, with a low around 46. North wind 10 to 15 mph, with gusts as high as 25 mph.
Tuesday
Mostly sunny, with a high near 69. North wind 5 to 10 mph, with gusts as high as 20 mph.
Tuesday Night
Mostly clear, with a low around 45. North wind around 5 mph becoming calm in the evening.
Wednesday
Sunny, with a high near 72.
Wednesday Night
Mostly clear, with a low around 48.
Thursday
Sunny, with a high near 77.
Thursday Night
Mostly clear, with a low around 49.
Friday
Sunny, with a high near 76.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Newcastle WY
 43.86°N 104.21°W (Elev. 4380 ft)
Last Update:
6:21 am MDT Sep 20, 2025
Forecast Valid:
6am MDT Sep 20, 2025-6pm MDT Sep 26, 2025
 
Forecast Discussion
 
Get as KML Get as XML

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