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

Heavy to Excessive Rainfall and Flooding Threats in the Central and Eastern U.S.; Heat and Fire Weather Concerns in the West

Thunderstorms producing excessive rainfall and potential flooding concerns will continue through tonight from the Southern Plains to the East Coast. Areas of greatest concern for flooding are over central Texas and the Mid-Atlantic. Heat will continue to build across the West through Tuesday. Heat Advisories and Extreme Heat Warnings are in effect. Fire Weather concerns continue through Monday. Read More >

Current conditions at

Mondell Field (KECS)

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

Fair

90°F

32°C

Humidity 16%
Wind Speed NE 6 G 16 mph
Barometer 30.09 in
Dewpoint 37°F (3°C)
Visibility 10.00 mi
Heat Index86°F (30°C)
Last update 13 Jul 4:55 pm MDT
Extended Forecast for

Newcastle WY

  • Tonight

    Tonight: Mostly clear, with a low around 65. Northeast wind 5 to 10 mph becoming east in the evening. Winds could gust as high as 15 mph.

    Low: 65 °F

    Mostly Clear

  • Monday

    Monday: A 20 percent chance of showers and thunderstorms after noon. Sunny, with a high near 95. East wind 5 to 10 mph becoming north in the afternoon. Winds could gust as high as 15 mph.

    High: 95 °F

    Sunny then
    Slight Chance
    T-storms

  • Monday Night

    Monday Night: A chance of showers and thunderstorms before 3am, then a slight chance of showers. Partly cloudy, with a low around 61. Southeast wind around 5 mph becoming north after midnight. Winds could gust as high as 15 mph. Chance of precipitation is 40%.

    Low: 61 °F

    Chance
    T-storms

  • Tuesday

    Tuesday: A 40 percent chance of showers and thunderstorms after noon. Mostly sunny, with a high near 81. North wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 81 °F

    Mostly Sunny
    then Chance
    T-storms

  • Tuesday Night

    Tuesday Night: Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 56. Northeast wind 5 to 10 mph becoming southeast after midnight. Winds could gust as high as 20 mph. Chance of precipitation is 70%.

    Low: 56 °F

    Showers
    Likely

  • Wednesday

    Wednesday: Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 69. Southeast wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 70%.

    High: 69 °F

    Showers
    Likely

  • Wednesday Night

    Wednesday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 53. East wind around 10 mph becoming north in the evening. Winds could gust as high as 20 mph. Chance of precipitation is 50%.

    Low: 53 °F

    Chance
    T-storms then
    Chance
    Showers

  • Thursday

    Thursday: Partly sunny, with a high near 73. South wind around 10 mph, with gusts as high as 20 mph.

    High: 73 °F

    Partly Sunny

  • Thursday Night

    Thursday Night: A slight chance of showers and thunderstorms. Mostly clear, with a low around 57.

    Low: 57 °F

    Slight Chance
    T-storms

Detailed Forecast

Tonight
Mostly clear, with a low around 65. Northeast wind 5 to 10 mph becoming east in the evening. Winds could gust as high as 15 mph.
Monday
A 20 percent chance of showers and thunderstorms after noon. Sunny, with a high near 95. East wind 5 to 10 mph becoming north in the afternoon. Winds could gust as high as 15 mph.
Monday Night
A chance of showers and thunderstorms before 3am, then a slight chance of showers. Partly cloudy, with a low around 61. Southeast wind around 5 mph becoming north after midnight. Winds could gust as high as 15 mph. Chance of precipitation is 40%.
Tuesday
A 40 percent chance of showers and thunderstorms after noon. Mostly sunny, with a high near 81. North wind 5 to 10 mph, with gusts as high as 20 mph.
Tuesday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 56. Northeast wind 5 to 10 mph becoming southeast after midnight. Winds could gust as high as 20 mph. Chance of precipitation is 70%.
Wednesday
Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 69. Southeast wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 70%.
Wednesday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 53. East wind around 10 mph becoming north in the evening. Winds could gust as high as 20 mph. Chance of precipitation is 50%.
Thursday
Partly sunny, with a high near 73. South wind around 10 mph, with gusts as high as 20 mph.
Thursday Night
A slight chance of showers and thunderstorms. Mostly clear, with a low around 57.
Friday
Mostly sunny, with a high near 82.
Friday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 60.
Saturday
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 83.
Saturday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 60.
Sunday
A slight chance of showers and thunderstorms. 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:
3:30 pm MDT Jul 13, 2025
Forecast Valid:
5pm MDT Jul 13, 2025-6pm MDT Jul 20, 2025
 
Forecast Discussion
 
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Additional Resources

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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