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

Early Heat Wave in the West; Fire Concerns in the Plains

An anomalously early heat wave will continue to intensify and expand across the West and Southwest as the week progresses. Numerous daily and potentially monthly record highs are expected to be broken. Elevated to critical fire weather conditions are expected today across the High Plains and southern Plains. Lake effect snow downwind of the Great Lakes will taper off today. Read More >

Current conditions at

Karst US-191 MP 55.3 (MTKAR)

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

unknown precip

42°F

6°C

Humidity 55%
Wind Speed SSW 5 MPH
Barometer NA
Dewpoint 27°F (-3°C)
Visibility NA
Wind Chill39°F (4°C)
Last update 17 Mar 06:45 AM MDT
Extended Forecast for

15 Miles ENE Big Sky MT

  • Today

    Today: Partly sunny, with a high near 39. Breezy, with a west wind 22 to 24 mph, with gusts as high as 38 mph.

    High: 39 °F

    Partly Sunny
    and Breezy

  • Tonight

    Tonight: Mostly cloudy, with a low around 34. Breezy, with a west wind 20 to 23 mph, with gusts as high as 31 mph.

    Low: 34 °F

    Mostly Cloudy
    then Mostly
    Cloudy and
    Breezy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 47. Breezy, with a west southwest wind 26 to 28 mph, with gusts as high as 46 mph.

    High: 47 °F

    Mostly Sunny
    and Breezy

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 36. Breezy, with a southwest wind 21 to 23 mph, with gusts as high as 36 mph.

    Low: 36 °F

    Mostly Cloudy
    and Breezy

  • Thursday

    Thursday: Mostly sunny, with a high near 51. Breezy, with a southwest wind 21 to 24 mph, with gusts as high as 43 mph.

    High: 51 °F

    Mostly Sunny
    and Breezy

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 37. Breezy, with a southwest wind around 22 mph, with gusts as high as 37 mph.

    Low: 37 °F

    Partly Cloudy
    then Partly
    Cloudy and
    Breezy

  • Friday

    Friday: Mostly sunny, with a high near 52. Breezy, with a southwest wind 21 to 23 mph, with gusts as high as 37 mph.

    High: 52 °F

    Mostly Sunny
    and Breezy

  • Friday Night

    Friday Night: Partly cloudy, with a low around 38. Breezy, with a southwest wind around 22 mph, with gusts as high as 34 mph.

    Low: 38 °F

    Partly Cloudy
    and Breezy
    then Partly
    Cloudy

  • Saturday

    Saturday: A chance of rain and snow, mainly after noon. Partly sunny, with a high near 48.

    High: 48 °F

    Chance
    Rain/Snow

Detailed Forecast

Today
Partly sunny, with a high near 39. Breezy, with a west wind 22 to 24 mph, with gusts as high as 38 mph.
Tonight
Mostly cloudy, with a low around 34. Breezy, with a west wind 20 to 23 mph, with gusts as high as 31 mph.
Wednesday
Mostly sunny, with a high near 47. Breezy, with a west southwest wind 26 to 28 mph, with gusts as high as 46 mph.
Wednesday Night
Mostly cloudy, with a low around 36. Breezy, with a southwest wind 21 to 23 mph, with gusts as high as 36 mph.
Thursday
Mostly sunny, with a high near 51. Breezy, with a southwest wind 21 to 24 mph, with gusts as high as 43 mph.
Thursday Night
Partly cloudy, with a low around 37. Breezy, with a southwest wind around 22 mph, with gusts as high as 37 mph.
Friday
Mostly sunny, with a high near 52. Breezy, with a southwest wind 21 to 23 mph, with gusts as high as 37 mph.
Friday Night
Partly cloudy, with a low around 38. Breezy, with a southwest wind around 22 mph, with gusts as high as 34 mph.
Saturday
A chance of rain and snow, mainly after noon. Partly sunny, with a high near 48.
Saturday Night
A slight chance of snow before midnight. Partly cloudy, with a low around 27.
Sunday
A slight chance of snow. Mostly sunny, with a high near 39.
Sunday Night
A slight chance of snow. Mostly cloudy, with a low around 26.
Monday
A slight chance of snow. Partly sunny, with a high near 40.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
15 Miles ENE Big Sky MT
 45.32°N 111.05°W (Elev. 8901 ft)
Last Update:
4:49 am MDT Mar 17, 2026
Forecast Valid:
7am MDT Mar 17, 2026-6pm MDT Mar 23, 2026
 
Forecast Discussion
 
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Additional Resources

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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