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

Super Typhoon Sinlaku to Impact the Marianas and Guam; Severe Weather Threat from the Central Plains to the Great Lakes

Super Typhoon Sinlaku will bring destructive winds, widespread heavy rain/flooding, and thunderstorms to the Marianas Islands into Wednesday. Tropical Storm conditions are likely over Guam. Severe thunderstorms and heavy rain are likely across the Upper Mississippi Valley and Great Lakes region with potential for large to very large hail, damaging wind, and tornadoes through Tuesday. Read More >

Current conditions at

Bearmouth I-90 MP 145.8 (MTBRM)

Lat: 46.71854°NLon: 113.29534°WElev: 3901.0ft.

NA

41°F

5°C

Humidity 99%
Wind Speed NW 1 MPH
Barometer NA
Dewpoint 41°F (5°C)
Visibility NA
Last update 13 Apr 10:15 AM MDT
Extended Forecast for

Greenough MT

  • Today

    Today: A 50 percent chance of showers. Mostly cloudy, with a high near 50. Calm wind becoming west 5 to 7 mph in the afternoon. Winds could gust as high as 18 mph.

    High: 50 °F

    Chance
    Showers

  • Tonight

    Tonight: A 30 percent chance of showers, mainly before 9pm. Mostly cloudy, with a low around 31. West southwest wind 5 to 7 mph becoming calm in the evening. Winds could gust as high as 18 mph.

    Low: 31 °F

    Chance
    Showers then
    Partly Cloudy

  • Tuesday

    Tuesday: Partly sunny, with a high near 52. Calm wind becoming west 5 to 9 mph in the afternoon. Winds could gust as high as 22 mph.

    High: 52 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: A 30 percent chance of showers after midnight. Mostly cloudy, with a low around 33. West wind 5 to 8 mph becoming calm in the evening. Winds could gust as high as 21 mph.

    Low: 33 °F

    Mostly Cloudy
    then Chance
    Showers

  • Wednesday

    Wednesday: Showers, mainly after noon. Snow level 4800 feet rising to 5600 feet in the afternoon. High near 51. Calm wind becoming west southwest 5 to 7 mph in the afternoon. Winds could gust as high as 18 mph. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.

    High: 51 °F

    Chance
    Showers then
    Showers

  • Wednesday Night

    Wednesday Night: Rain showers before 9pm, then rain and snow showers between 9pm and midnight, then snow showers likely after midnight. Snow level 5400 feet lowering to 3800 feet after midnight . Low around 26. Chance of precipitation is 90%. New snow accumulation of less than a half inch possible.

    Low: 26 °F

    Rain/Snow
    then Snow
    Showers
    Likely

  • Thursday

    Thursday: Snow showers. Some thunder is also possible. High near 41. Chance of precipitation is 90%. New snow accumulation of less than one inch possible.

    High: 41 °F

    Snow Showers

  • Thursday Night

    Thursday Night: A chance of snow before midnight. Mostly cloudy, with a low around 21.

    Low: 21 °F

    Chance Snow
    then Partly
    Cloudy

  • Friday

    Friday: A chance of snow, mainly after noon. Mostly sunny, with a high near 46.

    High: 46 °F

    Chance Snow

Detailed Forecast

Today
A 50 percent chance of showers. Mostly cloudy, with a high near 50. Calm wind becoming west 5 to 7 mph in the afternoon. Winds could gust as high as 18 mph.
Tonight
A 30 percent chance of showers, mainly before 9pm. Mostly cloudy, with a low around 31. West southwest wind 5 to 7 mph becoming calm in the evening. Winds could gust as high as 18 mph.
Tuesday
Partly sunny, with a high near 52. Calm wind becoming west 5 to 9 mph in the afternoon. Winds could gust as high as 22 mph.
Tuesday Night
A 30 percent chance of showers after midnight. Mostly cloudy, with a low around 33. West wind 5 to 8 mph becoming calm in the evening. Winds could gust as high as 21 mph.
Wednesday
Showers, mainly after noon. Snow level 4800 feet rising to 5600 feet in the afternoon. High near 51. Calm wind becoming west southwest 5 to 7 mph in the afternoon. Winds could gust as high as 18 mph. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.
Wednesday Night
Rain showers before 9pm, then rain and snow showers between 9pm and midnight, then snow showers likely after midnight. Snow level 5400 feet lowering to 3800 feet after midnight . Low around 26. Chance of precipitation is 90%. New snow accumulation of less than a half inch possible.
Thursday
Snow showers. Some thunder is also possible. High near 41. Chance of precipitation is 90%. New snow accumulation of less than one inch possible.
Thursday Night
A chance of snow before midnight. Mostly cloudy, with a low around 21.
Friday
A chance of snow, mainly after noon. Mostly sunny, with a high near 46.
Friday Night
Partly cloudy, with a low around 21.
Saturday
Mostly sunny, with a high near 55.
Saturday Night
Partly cloudy, with a low around 27.
Sunday
A slight chance of rain. Snow level 4500 feet rising to 6400 feet in the afternoon. Mostly sunny, with a high near 61.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Greenough MT
 46.92°N 113.45°W (Elev. 3783 ft)
Last Update:
2:01 am MDT Apr 13, 2026
Forecast Valid:
10am MDT Apr 13, 2026-6pm MDT Apr 19, 2026
 
Forecast Discussion
 
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Additional Resources

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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