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

66°F

19°C

Humidity 19%
Wind Speed SSE 8 MPH
Barometer NA
Dewpoint 22°F (-6°C)
Visibility NA
Last update 18 Oct 03:45 PM MDT
Extended Forecast for

8 Miles ENE Big Sky MT

  • Tonight

    Tonight: Mostly clear, with a low around 30. Calm wind becoming south around 6 mph in the evening.

    Low: 30 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 66. South southwest wind around 7 mph.

    High: 66 °F

    Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 31. South wind 5 to 7 mph.

    Low: 31 °F

    Partly Cloudy

  • Tuesday

    Tuesday: A 20 percent chance of rain after noon. Mostly sunny, with a high near 64. South wind around 5 mph becoming calm in the afternoon.

    High: 64 °F

    Mostly Sunny
    then Slight
    Chance Rain

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 32. Light and variable wind.

    Low: 32 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 65. South southeast wind 3 to 6 mph.

    High: 65 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 34. South wind 3 to 7 mph.

    Low: 34 °F

    Mostly Clear

  • Thursday

    Thursday: Mostly sunny, with a high near 65. South southeast wind 5 to 9 mph, with gusts as high as 20 mph.

    High: 65 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Rain likely, mainly after midnight. Mostly cloudy, with a low around 34.

    Low: 34 °F

    Rain Likely

Detailed Forecast

Tonight
Mostly clear, with a low around 30. Calm wind becoming south around 6 mph in the evening.
Monday
Sunny, with a high near 66. South southwest wind around 7 mph.
Monday Night
Partly cloudy, with a low around 31. South wind 5 to 7 mph.
Tuesday
A 20 percent chance of rain after noon. Mostly sunny, with a high near 64. South wind around 5 mph becoming calm in the afternoon.
Tuesday Night
Partly cloudy, with a low around 32. Light and variable wind.
Wednesday
Mostly sunny, with a high near 65. South southeast wind 3 to 6 mph.
Wednesday Night
Mostly clear, with a low around 34. South wind 3 to 7 mph.
Thursday
Mostly sunny, with a high near 65. South southeast wind 5 to 9 mph, with gusts as high as 20 mph.
Thursday Night
Rain likely, mainly after midnight. Mostly cloudy, with a low around 34.
Friday
Rain before 3pm, then rain and snow. Cloudy, with a high near 47.
Friday Night
Rain and snow likely. Mostly cloudy, with a low around 23.
Saturday
Mostly sunny, with a high near 45.
Saturday Night
A slight chance of rain and snow. Partly cloudy, with a low around 25.
Sunday
A slight chance of rain and snow. Mostly sunny, with a high near 54.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
8 Miles ENE Big Sky MT
 45.33°N 111.18°W (Elev. 5978 ft)
Last Update:
12:31 pm MDT Oct 18, 2026
Forecast Valid:
4pm MDT Oct 18, 2026-6pm MDT Oct 25, 2026
 
Forecast Discussion
 
Get as KML Get as XML

Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

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