Severe Weather and Heavy Rainfall from the High Plains to the Ohio Valley; Heat Continuing in the Central Plains and Southeast

A stationary front will be the focus for daily showers and thunderstorms capable of widely scattered flash flooding and severe weather from the High Plains to the Ohio Valley. Monsoonal thunderstorms could cause local flash flooding across the Southwest and the Great Basin. Dangerous heat continues across the Central Plains and Southeast. Many areas will see their hottest temperatures of the year. Read More >

Current conditions at

Karst US-191 MP 55.3 (MTKAR)

Lat: 45.34534°NLon: 111.17261°WElev: 5699.0ft.

NA

61°F

16°C

Humidity 48%
Wind Speed W 0 MPH
Barometer NA
Dewpoint 41°F (5°C)
Visibility NA
Last update 12 Aug 10:30 AM MDT
Extended Forecast for

4 Miles E Big Sky MT

  • Today

    Today: A 40 percent chance of showers and thunderstorms, mainly after 4pm.  Areas of smoke. Partly sunny, with a high near 85. Calm wind becoming west southwest 5 to 7 mph in the afternoon.

    High: 85 °F

    Areas Smoke
    then Chance
    Showers

  • Tonight

    Tonight: A chance of showers and thunderstorms before 9pm, then a slight chance of showers between 9pm and 10pm.  Patchy smoke. Mostly cloudy, with a low around 47. South wind 5 to 7 mph becoming calm  in the evening.  Chance of precipitation is 40%.

    Low: 47 °F

    Chance
    Showers then
    Patchy Smoke

  • Thursday

    Thursday: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 4pm.  Patchy smoke. Mostly cloudy, with a high near 78. Calm wind becoming southwest around 6 mph in the afternoon.  Chance of precipitation is 60%.

    High: 78 °F

    Patchy Smoke
    then Showers
    Likely

  • Thursday Night

    Thursday Night: Showers likely and possibly a thunderstorm, then showers after midnight.  Low around 46. South wind around 6 mph becoming calm  in the evening.  Chance of precipitation is 80%.

    Low: 46 °F

    Showers

  • Friday

    Friday: A chance of showers, then showers and possibly a thunderstorm after noon.  High near 72. Calm wind.  Chance of precipitation is 90%.

    High: 72 °F

    Chance
    Showers then
    Showers

  • Friday Night

    Friday Night: Showers and possibly a thunderstorm before 9pm, then showers between 9pm and midnight.  Low around 44. Calm wind.  Chance of precipitation is 80%.

    Low: 44 °F

    Showers then
    Mostly Cloudy

  • Saturday

    Saturday: A chance of showers, then showers and possibly a thunderstorm after noon.  High near 75. Calm wind.  Chance of precipitation is 80%.

    High: 75 °F

    Chance
    Showers then
    Showers

  • Saturday Night

    Saturday Night: Showers likely and possibly a thunderstorm before midnight, then a slight chance of showers.  Mostly cloudy, with a low around 43. Calm wind.

    Low: 43 °F

    Showers
    Likely

  • Sunday

    Sunday: A slight chance of showers and thunderstorms after noon.  Mostly sunny, with a high near 79.

    High: 79 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

Detailed Forecast

Today
A 40 percent chance of showers and thunderstorms, mainly after 4pm. Areas of smoke. Partly sunny, with a high near 85. Calm wind becoming west southwest 5 to 7 mph in the afternoon.
Tonight
A chance of showers and thunderstorms before 9pm, then a slight chance of showers between 9pm and 10pm. Patchy smoke. Mostly cloudy, with a low around 47. South wind 5 to 7 mph becoming calm in the evening. Chance of precipitation is 40%.
Thursday
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 4pm. Patchy smoke. Mostly cloudy, with a high near 78. Calm wind becoming southwest around 6 mph in the afternoon. Chance of precipitation is 60%.
Thursday Night
Showers likely and possibly a thunderstorm, then showers after midnight. Low around 46. South wind around 6 mph becoming calm in the evening. Chance of precipitation is 80%.
Friday
A chance of showers, then showers and possibly a thunderstorm after noon. High near 72. Calm wind. Chance of precipitation is 90%.
Friday Night
Showers and possibly a thunderstorm before 9pm, then showers between 9pm and midnight. Low around 44. Calm wind. Chance of precipitation is 80%.
Saturday
A chance of showers, then showers and possibly a thunderstorm after noon. High near 75. Calm wind. Chance of precipitation is 80%.
Saturday Night
Showers likely and possibly a thunderstorm before midnight, then a slight chance of showers. Mostly cloudy, with a low around 43. Calm wind.
Sunday
A slight chance of showers and thunderstorms after noon. Mostly sunny, with a high near 79.
Sunday Night
A slight chance of showers and thunderstorms before midnight. Mostly cloudy, with a low around 46.
Monday
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 80.
Monday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 47.
Tuesday
A chance of showers and thunderstorms. Partly sunny, with a high near 79.
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ABOUT THIS FORECAST

 
Point Forecast:
4 Miles E Big Sky MT
 45.26°N 111.26°W (Elev. 5997 ft)
10:07 am MDT Aug 12, 2026
10am MDT Aug 12, 2026-6pm MDT Aug 18, 2026
 
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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