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

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

Lewistown, Lewistown Municipal Airport (KLWT)

Lat: 47.04917°NLon: 109.46639°WElev: 4167.0ft.

Clear

44°F

7°C

Humidity 59%
Wind Speed WSW 8 MPH
Barometer 29.88 in (1011.85 mb)
Dewpoint 31°F (-1°C)
Visibility 10.00 mi
Wind Chill39°F (4°C)
Last update 21 Mar 02:54 AM MDT
Extended Forecast for

Lewistown MT

  • Overnight

    Overnight: Mostly cloudy, with a low around 45. North wind around 7 mph becoming southeast.

    Low: 45 °F

    Mostly Cloudy

  • Saturday

    Saturday: Rain, mainly after noon. Temperature rising to near 53 by 10am, then falling to around 45 during the remainder of the day. South wind 5 to 13 mph becoming north northwest in the afternoon. Winds could gust as high as 21 mph. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 53 °F⇓

    Chance Rain
    then Rain

  • Saturday Night

    Saturday Night: A 40 percent chance of rain, mainly before 8pm. Partly cloudy, with a low around 28. West northwest wind 5 to 9 mph becoming light and variable. Winds could gust as high as 18 mph.

    Low: 28 °F

    Chance Rain
    then Partly
    Cloudy

  • Sunday

    Sunday: Sunny, with a high near 52. West wind 8 to 17 mph, with gusts as high as 28 mph.

    High: 52 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 29. West northwest wind 5 to 11 mph becoming south southwest after midnight. Winds could gust as high as 22 mph.

    Low: 29 °F

    Mostly Cloudy

  • Monday

    Monday: Partly sunny, with a high near 59. Calm wind becoming west northwest 5 to 7 mph in the afternoon.

    High: 59 °F

    Partly Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 34. North northwest wind 5 to 8 mph becoming southeast in the evening.

    Low: 34 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: A slight chance of rain and snow after noon. Mostly cloudy, with a high near 57. South wind 5 to 9 mph, with gusts as high as 18 mph.

    High: 57 °F

    Mostly Cloudy
    then Slight
    Chance
    Rain/Snow

  • Tuesday Night

    Tuesday Night: A slight chance of rain before midnight. Mostly cloudy, with a low around 40.

    Low: 40 °F

    Slight Chance
    Rain then
    Mostly Cloudy

Detailed Forecast

Overnight
Mostly cloudy, with a low around 45. North wind around 7 mph becoming southeast.
Saturday
Rain, mainly after noon. Temperature rising to near 53 by 10am, then falling to around 45 during the remainder of the day. South wind 5 to 13 mph becoming north northwest in the afternoon. Winds could gust as high as 21 mph. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.
Saturday Night
A 40 percent chance of rain, mainly before 8pm. Partly cloudy, with a low around 28. West northwest wind 5 to 9 mph becoming light and variable. Winds could gust as high as 18 mph.
Sunday
Sunny, with a high near 52. West wind 8 to 17 mph, with gusts as high as 28 mph.
Sunday Night
Mostly cloudy, with a low around 29. West northwest wind 5 to 11 mph becoming south southwest after midnight. Winds could gust as high as 22 mph.
Monday
Partly sunny, with a high near 59. Calm wind becoming west northwest 5 to 7 mph in the afternoon.
Monday Night
Mostly cloudy, with a low around 34. North northwest wind 5 to 8 mph becoming southeast in the evening.
Tuesday
A slight chance of rain and snow after noon. Mostly cloudy, with a high near 57. South wind 5 to 9 mph, with gusts as high as 18 mph.
Tuesday Night
A slight chance of rain before midnight. Mostly cloudy, with a low around 40.
Wednesday
A slight chance of rain after noon. Partly sunny, with a high near 59.
Wednesday Night
A chance of rain and snow. Mostly cloudy, with a low around 27.
Thursday
A slight chance of snow. Mostly sunny, with a high near 46.
Thursday Night
Mostly cloudy, with a low around 23.
Friday
Mostly sunny, with a high near 53.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Lewistown MT
 47.07°N 109.43°W (Elev. 3898 ft)
Last Update:
2:52 am MDT Mar 21, 2026
Forecast Valid:
3am MDT Mar 21, 2026-6pm MDT Mar 27, 2026
 
Forecast Discussion
 
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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

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation