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

27°F

-3°C

Humidity 92%
Wind Speed WNW 0 MPH
Barometer NA
Dewpoint 25°F (-4°C)
Visibility NA
Last update 18 May 11:00 PM MDT
Extended Forecast for

4 Miles E Big Sky MT

  • Tonight

    Tonight: Mostly clear, with a low around 20. Calm wind.

    Low: 20 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 59. Light and variable wind.

    High: 59 °F

    Sunny

  • Tuesday Night

    Tuesday Night: A 30 percent chance of showers, mainly between 7pm and midnight. Mostly cloudy, with a low around 31. Calm wind.

    Low: 31 °F

    Chance
    Showers then
    Partly Cloudy

  • Wednesday

    Wednesday: A 40 percent chance of showers and thunderstorms after noon. Partly sunny, with a high near 55. Calm wind.

    High: 55 °F

    Mostly Sunny
    then Chance
    Showers

  • Wednesday Night

    Wednesday Night: Rain before midnight, then rain and snow. Some thunder is also possible. Low around 35. Calm wind. Chance of precipitation is 90%. Little or no snow accumulation expected.

    Low: 35 °F

    Showers then
    Rain/Snow

  • Thursday

    Thursday: Rain and snow likely before noon, then a chance of rain showers. Some thunder is also possible. Partly sunny, with a high near 58. Light north wind. Chance of precipitation is 70%. Little or no snow accumulation expected.

    High: 58 °F

    Rain/Snow
    Likely then
    Chance
    Showers

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 32. North wind around 5 mph becoming calm in the evening.

    Low: 32 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 64. Light and variable wind.

    High: 64 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 35.

    Low: 35 °F

    Partly Cloudy

Detailed Forecast

Tonight
Mostly clear, with a low around 20. Calm wind.
Tuesday
Sunny, with a high near 59. Light and variable wind.
Tuesday Night
A 30 percent chance of showers, mainly between 7pm and midnight. Mostly cloudy, with a low around 31. Calm wind.
Wednesday
A 40 percent chance of showers and thunderstorms after noon. Partly sunny, with a high near 55. Calm wind.
Wednesday Night
Rain before midnight, then rain and snow. Some thunder is also possible. Low around 35. Calm wind. Chance of precipitation is 90%. Little or no snow accumulation expected.
Thursday
Rain and snow likely before noon, then a chance of rain showers. Some thunder is also possible. Partly sunny, with a high near 58. Light north wind. Chance of precipitation is 70%. Little or no snow accumulation expected.
Thursday Night
Partly cloudy, with a low around 32. North wind around 5 mph becoming calm in the evening.
Friday
Mostly sunny, with a high near 64. Light and variable wind.
Friday Night
Partly cloudy, with a low around 35.
Saturday
Sunny, with a high near 72.
Saturday Night
Partly cloudy, with a low around 40.
Sunday
Sunny, with a high near 77.
Sunday Night
Mostly clear, with a low around 43.
Memorial Day
Sunny, with a high near 79.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
4 Miles E Big Sky MT
 45.26°N 111.26°W (Elev. 5997 ft)
Last Update:
9:56 pm MDT May 18, 2026
Forecast Valid:
11pm MDT May 18, 2026-6pm MDT May 25, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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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