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

80°F

27°C

Humidity 24%
Wind Speed NNE 3 MPH
Barometer NA
Dewpoint 40°F (4°C)
Visibility NA
Heat Index79°F (26°C)
Last update 04 Jul 02:45 PM MDT
Extended Forecast for

3 Miles NNE Big Sky MT

  • Tonight

    Tonight: Mostly clear, with a low around 48. Southwest wind 6 to 14 mph, with gusts as high as 25 mph.

    Low: 48 °F

    Mostly Clear

  • Sunday

    Sunday: A 40 percent chance of showers and thunderstorms, mainly after 3pm. Increasing clouds, with a high near 71. West southwest wind 6 to 14 mph, with gusts as high as 24 mph.

    High: 71 °F

    Sunny then
    Chance
    T-storms

  • Sunday Night

    Sunday Night: A 30 percent chance of showers and thunderstorms, mainly before 7pm. Mostly cloudy, with a low around 48. West wind 5 to 9 mph becoming calm after midnight. Winds could gust as high as 18 mph.

    Low: 48 °F

    Chance
    Showers then
    Mostly Cloudy

  • Monday

    Monday: A 50 percent chance of showers and thunderstorms after noon. Partly sunny, with a high near 68. Calm wind becoming west southwest 5 to 9 mph in the morning.

    High: 68 °F

    Mostly Sunny
    then Chance
    T-storms

  • Monday Night

    Monday Night: Showers likely and possibly a thunderstorm before midnight, then a slight chance of showers. Mostly cloudy, with a low around 47. Southeast wind 5 to 8 mph becoming north in the evening. Chance of precipitation is 60%.

    Low: 47 °F

    Showers
    Likely then
    Slight Chance
    Showers

  • Tuesday

    Tuesday: A 30 percent chance of showers and thunderstorms after noon. Mostly sunny, with a high near 66. South southwest wind 5 to 11 mph becoming west northwest in the afternoon. Winds could gust as high as 20 mph.

    High: 66 °F

    Mostly Sunny
    then Chance
    T-storms

  • Tuesday Night

    Tuesday Night: A 20 percent chance of showers and thunderstorms before midnight. Partly cloudy, with a low around 48. Northwest wind 5 to 9 mph becoming south southeast after midnight.

    Low: 48 °F

    Slight Chance
    T-storms then
    Partly Cloudy

  • Wednesday

    Wednesday: A chance of showers and thunderstorms after noon. Mostly sunny, with a high near 69. South wind 5 to 14 mph becoming west in the afternoon. Winds could gust as high as 24 mph.

    High: 69 °F

    Sunny then
    Chance
    T-storms

  • Wednesday Night

    Wednesday Night: A slight chance of showers and thunderstorms before midnight. Partly cloudy, with a low around 47.

    Low: 47 °F

    Slight Chance
    T-storms then
    Mostly Clear

Detailed Forecast

Tonight
Mostly clear, with a low around 48. Southwest wind 6 to 14 mph, with gusts as high as 25 mph.
Sunday
A 40 percent chance of showers and thunderstorms, mainly after 3pm. Increasing clouds, with a high near 71. West southwest wind 6 to 14 mph, with gusts as high as 24 mph.
Sunday Night
A 30 percent chance of showers and thunderstorms, mainly before 7pm. Mostly cloudy, with a low around 48. West wind 5 to 9 mph becoming calm after midnight. Winds could gust as high as 18 mph.
Monday
A 50 percent chance of showers and thunderstorms after noon. Partly sunny, with a high near 68. Calm wind becoming west southwest 5 to 9 mph in the morning.
Monday Night
Showers likely and possibly a thunderstorm before midnight, then a slight chance of showers. Mostly cloudy, with a low around 47. Southeast wind 5 to 8 mph becoming north in the evening. Chance of precipitation is 60%.
Tuesday
A 30 percent chance of showers and thunderstorms after noon. Mostly sunny, with a high near 66. South southwest wind 5 to 11 mph becoming west northwest in the afternoon. Winds could gust as high as 20 mph.
Tuesday Night
A 20 percent chance of showers and thunderstorms before midnight. Partly cloudy, with a low around 48. Northwest wind 5 to 9 mph becoming south southeast after midnight.
Wednesday
A chance of showers and thunderstorms after noon. Mostly sunny, with a high near 69. South wind 5 to 14 mph becoming west in the afternoon. Winds could gust as high as 24 mph.
Wednesday Night
A slight chance of showers and thunderstorms before midnight. Partly cloudy, with a low around 47.
Thursday
Sunny, with a high near 67.
Thursday Night
Mostly clear, with a low around 45.
Friday
Sunny, with a high near 70.
Friday Night
Mostly clear, with a low around 48.
Saturday
Sunny, with a high near 73.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
3 Miles NNE Big Sky MT
 45.32°N 111.3°W (Elev. 8465 ft)
Last Update:
12:31 pm MDT Jul 4, 2026
Forecast Valid:
3pm MDT Jul 4, 2026-6pm MDT Jul 11, 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