Heat the Southwest; Fire Weather in the Central U.S.; Kona Low Impacting Hawaii

A rare March heat wave is ongoing with much above-normal temperatures over the Southwest U.S. through this weekend. Periods of critical fire weather will persist from the central Rockies to the central and southern Plains through the weekend as gusty winds and low relative humidity continue. A Kona low will continue to bring several rounds of moderate to heavy rainfall to Hawaii through Sunday. Read More >

Current conditions at

Karst US-191 MP 55.3 (MTKAR)

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

unknown precip

35°F

2°C

Humidity 83%
Wind Speed SE 0 MPH
Barometer NA
Dewpoint 30°F (-1°C)
Visibility NA
Last update 21 Mar 01:15 AM MDT
Extended Forecast for

6 Miles ESE Big Sky MT

  • Overnight

    Overnight: Partly cloudy, with a steady temperature around 46. South southeast wind 9 to 13 mph.

    Low: 46 °F

    Partly Cloudy

  • Saturday

    Saturday: A 40 percent chance of rain, mainly after 1pm.  Increasing clouds, with a high near 59. South southeast wind 11 to 17 mph becoming north northwest in the afternoon. Winds could gust as high as 30 mph.

    High: 59 °F

    Mostly Sunny
    then Chance
    Rain

  • Saturday Night

    Saturday Night: A chance of rain and snow before 11pm, then a chance of snow between 11pm and 1am.  Partly cloudy, with a low around 29. North wind 5 to 9 mph becoming light and variable.  Chance of precipitation is 40%. New snow accumulation of less than a half inch possible.

    Low: 29 °F

    Chance
    Rain/Snow
    then Slight
    Chance Snow

  • Sunday

    Sunday: Sunny, with a high near 48. South wind 5 to 10 mph becoming west in the afternoon. Winds could gust as high as 22 mph.

    High: 48 °F

    Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 30. South southwest wind 5 to 9 mph, with gusts as high as 18 mph.

    Low: 30 °F

    Partly Cloudy

  • Monday

    Monday: Partly sunny, with a high near 54. Calm wind becoming west southwest 5 to 7 mph in the afternoon.

    High: 54 °F

    Partly Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 36. West southwest wind around 6 mph becoming calm  in the evening.

    Low: 36 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: A slight chance of rain and snow before noon, then a chance of rain.  Mostly cloudy, with a high near 55. Calm wind becoming south southwest 5 to 9 mph in the afternoon. Winds could gust as high as 20 mph.

    High: 55 °F

    Slight Chance
    Rain/Snow
    then Chance
    Rain

  • Tuesday Night

    Tuesday Night: A slight chance of rain before midnight.  Mostly cloudy, with a low around 41.

    Low: 41 °F

    Slight Chance
    Rain then
    Mostly Cloudy

Detailed Forecast

Overnight
Partly cloudy, with a steady temperature around 46. South southeast wind 9 to 13 mph.
Saturday
A 40 percent chance of rain, mainly after 1pm. Increasing clouds, with a high near 59. South southeast wind 11 to 17 mph becoming north northwest in the afternoon. Winds could gust as high as 30 mph.
Saturday Night
A chance of rain and snow before 11pm, then a chance of snow between 11pm and 1am. Partly cloudy, with a low around 29. North wind 5 to 9 mph becoming light and variable. Chance of precipitation is 40%. New snow accumulation of less than a half inch possible.
Sunday
Sunny, with a high near 48. South wind 5 to 10 mph becoming west in the afternoon. Winds could gust as high as 22 mph.
Sunday Night
Partly cloudy, with a low around 30. South southwest wind 5 to 9 mph, with gusts as high as 18 mph.
Monday
Partly sunny, with a high near 54. Calm wind becoming west southwest 5 to 7 mph in the afternoon.
Monday Night
Mostly cloudy, with a low around 36. West southwest wind around 6 mph becoming calm in the evening.
Tuesday
A slight chance of rain and snow before noon, then a chance of rain. Mostly cloudy, with a high near 55. Calm wind becoming south southwest 5 to 9 mph in the afternoon. Winds could gust as high as 20 mph.
Tuesday Night
A slight chance of rain before midnight. Mostly cloudy, with a low around 41.
Wednesday
A chance of rain, mainly after noon. Partly sunny, with a high near 56.
Wednesday Night
A slight chance of rain and snow. Mostly cloudy, with a low around 32.
Thursday
A slight chance of snow. Mostly sunny, with a high near 45.
Thursday Night
Mostly cloudy, with a low around 25.
Friday
Mostly sunny, with a high near 49.
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ABOUT THIS FORECAST

 
Point Forecast:
6 Miles ESE Big Sky MT
 45.24°N 111.22°W (Elev. 7129 ft)
12:51 am MDT Mar 21, 2026
1am MDT Mar 21, 2026-6pm MDT Mar 27, 2026
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database