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

Tropical Storm Arthur and Heavy Rainfall in the South; Severe Weather in the Midwest

An outbreak of severe thunderstorms is expected across portions of Illinois and Indiana tonight. Intense tornadoes, swaths of damaging gusts, and hail in excess of 2 inches in diameter possible. Tropical Storm Arthur will continue to produce strong winds across coastal Upper Texas and Louisiana tonight, as well as potentially life-threatening flooding across southern Louisiana into Mississippi. Read More >

Current conditions at

Garrison I-90 MP 174.4 (MTGAR)

Lat: 46.52361°NLon: 112.80843°WElev: 4327.0ft.

NA

43°F

6°C

Humidity 78%
Wind Speed SSE 0 MPH
Barometer NA
Dewpoint 37°F (3°C)
Visibility NA
Last update 18 Jun 02:45 AM MDT
Extended Forecast for

13 Miles SSE Helmville MT

  • Overnight

    Overnight: Partly cloudy, with a low around 43. West wind around 6 mph.

    Low: 43 °F

    Partly Cloudy

  • Thursday

    Thursday: Sunny, with a high near 62. West wind 6 to 11 mph, with gusts as high as 23 mph.

    High: 62 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 41. Northwest wind 7 to 10 mph becoming east after midnight. Winds could gust as high as 21 mph.

    Low: 41 °F

    Mostly Clear

  • Juneteenth

    Juneteenth: Partly sunny, with a high near 67. East wind 5 to 9 mph, with gusts as high as 18 mph.

    High: 67 °F

    Partly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 46. East northeast wind around 7 mph.

    Low: 46 °F

    Partly Cloudy

  • Saturday

    Saturday: Partly sunny, with a high near 66.

    High: 66 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 45.

    Low: 45 °F

    Partly Cloudy

  • Sunday

    Sunday: Sunny, with a high near 63.

    High: 63 °F

    Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 40.

    Low: 40 °F

    Partly Cloudy

Detailed Forecast

Overnight
Partly cloudy, with a low around 43. West wind around 6 mph.
Thursday
Sunny, with a high near 62. West wind 6 to 11 mph, with gusts as high as 23 mph.
Thursday Night
Mostly clear, with a low around 41. Northwest wind 7 to 10 mph becoming east after midnight. Winds could gust as high as 21 mph.
Juneteenth
Partly sunny, with a high near 67. East wind 5 to 9 mph, with gusts as high as 18 mph.
Friday Night
Partly cloudy, with a low around 46. East northeast wind around 7 mph.
Saturday
Partly sunny, with a high near 66.
Saturday Night
Partly cloudy, with a low around 45.
Sunday
Sunny, with a high near 63.
Sunday Night
Partly cloudy, with a low around 40.
Monday
Sunny, with a high near 63.
Monday Night
Mostly clear, with a low around 42.
Tuesday
Sunny, with a high near 71.
Tuesday Night
Mostly clear, with a low around 48.
Wednesday
Sunny, with a high near 69.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
13 Miles SSE Helmville MT
 46.7°N 112.84°W (Elev. 6558 ft)
Last Update:
2:01 am MDT Jun 18, 2026
Forecast Valid:
3am MDT Jun 18, 2026-6pm MDT Jun 24, 2026
 
Forecast Discussion
 
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Additional Resources

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High Temperature

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Chance of Precipitation