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.

unknown precip

69°F

21°C

Humidity 45%
Wind Speed NW 9 MPH
Barometer NA
Dewpoint 47°F (8°C)
Visibility NA
Last update 19 Jun 05:00 PM MDT
Extended Forecast for

4 Miles ENE Big Sky MT

  • Tonight

    Tonight: Mostly cloudy, with a low around 46. Light and variable wind.

    Low: 46 °F

    Mostly Cloudy

  • Saturday

    Saturday: Showers and possibly a thunderstorm. High near 71. Light southwest wind. Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 71 °F

    Chance
    Showers then
    Showers

  • Saturday Night

    Saturday Night: Showers and possibly a thunderstorm before 10pm, then a chance of showers between 10pm and midnight. Low around 43. Calm wind. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 43 °F

    Showers then
    Mostly Cloudy

  • Sunday

    Sunday: A slight chance of showers between noon and 3pm, then a slight chance of showers and thunderstorms after 3pm. Mostly sunny, with a high near 72. Calm wind becoming west around 6 mph in the afternoon. Chance of precipitation is 20%.

    High: 72 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

  • Sunday Night

    Sunday Night: A slight chance of showers and thunderstorms before 9pm, then a slight chance of showers between 9pm and midnight. Partly cloudy, with a low around 39. Light and variable wind. Chance of precipitation is 20%.

    Low: 39 °F

    Slight Chance
    T-storms then
    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 68. Calm wind becoming northwest around 6 mph in the afternoon.

    High: 68 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 37. North northwest wind around 6 mph becoming calm in the evening.

    Low: 37 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 76. Calm wind becoming northwest around 6 mph in the afternoon.

    High: 76 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 42.

    Low: 42 °F

    Mostly Clear

Detailed Forecast

Tonight
Mostly cloudy, with a low around 46. Light and variable wind.
Saturday
Showers and possibly a thunderstorm. High near 71. Light southwest wind. Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Saturday Night
Showers and possibly a thunderstorm before 10pm, then a chance of showers between 10pm and midnight. Low around 43. Calm wind. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Sunday
A slight chance of showers between noon and 3pm, then a slight chance of showers and thunderstorms after 3pm. Mostly sunny, with a high near 72. Calm wind becoming west around 6 mph in the afternoon. Chance of precipitation is 20%.
Sunday Night
A slight chance of showers and thunderstorms before 9pm, then a slight chance of showers between 9pm and midnight. Partly cloudy, with a low around 39. Light and variable wind. Chance of precipitation is 20%.
Monday
Mostly sunny, with a high near 68. Calm wind becoming northwest around 6 mph in the afternoon.
Monday Night
Mostly clear, with a low around 37. North northwest wind around 6 mph becoming calm in the evening.
Tuesday
Sunny, with a high near 76. Calm wind becoming northwest around 6 mph in the afternoon.
Tuesday Night
Mostly clear, with a low around 42.
Wednesday
Mostly sunny, with a high near 80.
Wednesday Night
Partly cloudy, with a low around 45.
Thursday
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 80.
Thursday Night
Partly cloudy, with a low around 45.
Friday
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 79.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
4 Miles ENE Big Sky MT
 45.28°N 111.26°W (Elev. 6663 ft)
Last Update:
4:52 pm MDT Jun 19, 2026
Forecast Valid:
5pm MDT Jun 19, 2026-6pm MDT Jun 26, 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