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

Areas of Dangerous Heat and Heavy Rain with Possible Flooding into this Weekend

Hot temperatures and high humidity are forecast to continue across the mid-Mississippi Valley into this weekend with heat advisories in effect. Heavy to excessive rainfall occurring at times through Sunday could bring areas of flooding to parts of the upper Midwest, central Great Lakes, southern New England and Virginia/North Carolina tidewater region. Read More >

Current conditions at

Lewistown Divide MT-200 MP 90.3 (MTLEW)

Lat: 47.07579°NLon: 109.26247°WElev: 4723.0ft.

NA

57°F

14°C

Humidity 64%
Wind Speed NW 2 MPH
Barometer NA
Dewpoint 45°F (7°C)
Visibility NA
Last update 18 Sep 04:30 AM MDT
Extended Forecast for

Forestgrove MT

  • Today

    Today: A 30 percent chance of showers, mainly after 5pm. Increasing clouds, with a high near 73. West wind 6 to 9 mph becoming north northeast in the afternoon.

    High: 73 °F

    Mostly Sunny
    then Chance
    Showers

  • Tonight

    Tonight: A chance of showers and thunderstorms before 2am, then showers likely between 2am and 3am, then rain likely after 3am. Cloudy, with a low around 49. North northeast wind 5 to 9 mph becoming light and variable. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 49 °F

    Chance
    Showers then
    Showers
    Likely

  • Saturday

    Saturday: Rain and possibly a thunderstorm before 3pm, then showers and possibly a thunderstorm, mainly after 3pm. High near 57. North northeast wind 6 to 9 mph, with gusts as high as 18 mph. Chance of precipitation is 90%. New rainfall amounts between a half and three quarters of an inch possible.

    High: 57 °F

    Showers

  • Saturday Night

    Saturday Night: Showers and possibly a thunderstorm. Patchy fog after 3am. Low around 46. North wind 3 to 8 mph. Chance of precipitation is 80%.

    Low: 46 °F

    Showers and
    Patchy Fog

  • Sunday

    Sunday: Showers likely, mainly before noon. Patchy fog before noon. Otherwise, mostly cloudy, with a high near 62. North wind 3 to 7 mph. Chance of precipitation is 60%.

    High: 62 °F

    Showers
    Likely and
    Patchy Fog

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 45. East wind 5 to 8 mph becoming calm after midnight.

    Low: 45 °F

    Partly Cloudy

  • Monday

    Monday: Sunny, with a high near 71. South wind 3 to 8 mph.

    High: 71 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 48. South southeast wind 7 to 11 mph becoming southwest after midnight. Winds could gust as high as 20 mph.

    Low: 48 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 75.

    High: 75 °F

    Mostly Sunny

Detailed Forecast

Today
A 30 percent chance of showers, mainly after 5pm. Increasing clouds, with a high near 73. West wind 6 to 9 mph becoming north northeast in the afternoon.
Tonight
A chance of showers and thunderstorms before 2am, then showers likely between 2am and 3am, then rain likely after 3am. Cloudy, with a low around 49. North northeast wind 5 to 9 mph becoming light and variable. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Saturday
Rain and possibly a thunderstorm before 3pm, then showers and possibly a thunderstorm, mainly after 3pm. High near 57. North northeast wind 6 to 9 mph, with gusts as high as 18 mph. Chance of precipitation is 90%. New rainfall amounts between a half and three quarters of an inch possible.
Saturday Night
Showers and possibly a thunderstorm. Patchy fog after 3am. Low around 46. North wind 3 to 8 mph. Chance of precipitation is 80%.
Sunday
Showers likely, mainly before noon. Patchy fog before noon. Otherwise, mostly cloudy, with a high near 62. North wind 3 to 7 mph. Chance of precipitation is 60%.
Sunday Night
Partly cloudy, with a low around 45. East wind 5 to 8 mph becoming calm after midnight.
Monday
Sunny, with a high near 71. South wind 3 to 8 mph.
Monday Night
Mostly clear, with a low around 48. South southeast wind 7 to 11 mph becoming southwest after midnight. Winds could gust as high as 20 mph.
Tuesday
Mostly sunny, with a high near 75.
Tuesday Night
Partly cloudy, with a low around 48.
Wednesday
Sunny, with a high near 75.
Wednesday Night
Mostly clear, with a low around 49.
Thursday
Sunny, with a high near 77.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Forestgrove MT
 46.99°N 109.07°W (Elev. 4203 ft)
Last Update:
4:41 am MDT Sep 18, 2026
Forecast Valid:
4am MDT Sep 18, 2026-6pm MDT Sep 24, 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