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

Karst US-191 MP 55.3 (MTKAR)

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

NA

49°F

9°C

Humidity 83%
Wind Speed WNW 0 MPH
Barometer NA
Dewpoint 44°F (7°C)
Visibility NA
Last update 25 Aug 01:00 AM MDT
Extended Forecast for

6 Miles ENE Big Sky MT

  • Overnight

    Overnight: Patchy smoke before 5am. Mostly cloudy, with a low around 51. Light south southwest wind.

    Low: 51 °F

    Patchy Smoke

  • Tuesday

    Tuesday: A 40 percent chance of showers and thunderstorms, mainly after 1pm. Partly sunny, with a high near 79. Calm wind becoming west northwest around 5 mph in the afternoon.

    High: 79 °F

    Partly Sunny
    then Chance
    T-storms

  • Tuesday Night

    Tuesday Night: A chance of showers and thunderstorms before 10pm, then a slight chance of showers between 10pm and 11pm. Mostly cloudy, with a low around 52. Calm wind becoming south southwest around 5 mph after midnight. Chance of precipitation is 40%.

    Low: 52 °F

    Chance
    Showers then
    Mostly Cloudy

  • Wednesday

    Wednesday: A 30 percent chance of showers and thunderstorms, mainly after 5pm. Mostly sunny, with a high near 81. West wind 3 to 5 mph.

    High: 81 °F

    Mostly Sunny
    then Chance
    Showers

  • Wednesday Night

    Wednesday Night: A 30 percent chance of showers before midnight. Mostly cloudy, with a low around 52. Calm wind becoming south around 5 mph after midnight.

    Low: 52 °F

    Chance
    Showers then
    Partly Cloudy

  • Thursday

    Thursday: A chance of showers and thunderstorms between noon and 3pm, then a slight chance of thunderstorms after 3pm. Mostly sunny, with a high near 82. South wind around 6 mph. Chance of precipitation is 30%.

    High: 82 °F

    Mostly Sunny
    then Chance
    Showers

  • Thursday Night

    Thursday Night: A chance of showers and thunderstorms before 9pm, then a chance of showers between 9pm and midnight. Mostly cloudy, with a low around 52. South wind 5 to 7 mph. Chance of precipitation is 40%.

    Low: 52 °F

    Chance
    Showers then
    Mostly Cloudy

  • Friday

    Friday: A chance of showers and thunderstorms after noon. Partly sunny, with a high near 77. South wind 6 to 8 mph, with gusts as high as 20 mph.

    High: 77 °F

    Mostly Sunny
    then Chance
    Showers

  • Friday Night

    Friday Night: Showers likely and possibly a thunderstorm before midnight, then a chance of showers. Mostly cloudy, with a low around 51.

    Low: 51 °F

    Showers
    Likely

Detailed Forecast

Overnight
Patchy smoke before 5am. Mostly cloudy, with a low around 51. Light south southwest wind.
Tuesday
A 40 percent chance of showers and thunderstorms, mainly after 1pm. Partly sunny, with a high near 79. Calm wind becoming west northwest around 5 mph in the afternoon.
Tuesday Night
A chance of showers and thunderstorms before 10pm, then a slight chance of showers between 10pm and 11pm. Mostly cloudy, with a low around 52. Calm wind becoming south southwest around 5 mph after midnight. Chance of precipitation is 40%.
Wednesday
A 30 percent chance of showers and thunderstorms, mainly after 5pm. Mostly sunny, with a high near 81. West wind 3 to 5 mph.
Wednesday Night
A 30 percent chance of showers before midnight. Mostly cloudy, with a low around 52. Calm wind becoming south around 5 mph after midnight.
Thursday
A chance of showers and thunderstorms between noon and 3pm, then a slight chance of thunderstorms after 3pm. Mostly sunny, with a high near 82. South wind around 6 mph. Chance of precipitation is 30%.
Thursday Night
A chance of showers and thunderstorms before 9pm, then a chance of showers between 9pm and midnight. Mostly cloudy, with a low around 52. South wind 5 to 7 mph. Chance of precipitation is 40%.
Friday
A chance of showers and thunderstorms after noon. Partly sunny, with a high near 77. South wind 6 to 8 mph, with gusts as high as 20 mph.
Friday Night
Showers likely and possibly a thunderstorm before midnight, then a chance of showers. Mostly cloudy, with a low around 51.
Saturday
A chance of showers, with thunderstorms also possible after noon. Partly sunny, with a high near 74.
Saturday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 47.
Sunday
A chance of showers and thunderstorms. Mostly sunny, with a high near 68.
Sunday Night
A slight chance of showers. Partly cloudy, with a low around 44.
Monday
Sunny, with a high near 74.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
6 Miles ENE Big Sky MT
 45.31°N 111.2°W (Elev. 6234 ft)
Last Update:
12:31 am MDT Aug 25, 2026
Forecast Valid:
1am MDT Aug 25, 2026-6pm MDT Aug 31, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation