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

Dangerous Heat and Heavy Rainfall into the Weekend

Hot temperatures and high humidity are forecast to continue across the mid-Mississippi Valley into this weekend. Heat Advisories remain in effect. Heavy to excessive rainfall occurring at times through the weekend could bring areas of flooding to parts of the northern Rockies, upper Midwest, central Great Lakes, and southern New England. Read More >

Hazardous Weather Conditions

Current conditions at

TOSTON (TOSM)

Lat: 46.12222°NLon: 111.49472°WElev: 4058.0ft.

NA

59°F

15°C

Humidity 81%
Wind Speed WNW 8 MPH
Barometer NA
Dewpoint 53°F (12°C)
Visibility NA
Last update 18 Sep 08:00 PM MDT
Extended Forecast for

Toston MT

Flood Watch until September 19, 06:00pm
Click here for hazard details and duration
Flood Watch
  •  
    Flood Watch until September 19, 06:00pm

    NOW until 6:00pm Sat

    Flood Watch

  • Tonight

    Low: 52 °F

    Showers

  • Saturday

    Saturday: Showers and possibly a thunderstorm, mainly before 5pm, then a chance of showers and thunderstorms after 5pm. High near 60. North wind 6 to 8 mph. Chance of precipitation is 90%. New rainfall amounts between a half and three quarters of an inch possible.

    High: 60 °F

    Showers

  • Saturday Night

    Saturday Night: A chance of rain before 3am, then a slight chance of rain after 4am. Patchy fog after 3am. Otherwise, mostly cloudy, with a low around 48. North wind around 5 mph becoming calm in the evening. Chance of precipitation is 50%.

    Low: 48 °F

    Chance Rain
    and Patchy
    Fog

  • Sunday

    Sunday: Patchy fog before 9am. Otherwise, partly sunny, with a high near 69. Light south southwest wind.

    High: 69 °F

    Patchy Fog
    then Mostly
    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 44. Light south southeast wind.

    Low: 44 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 76. South southeast wind 3 to 5 mph.

    High: 76 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 47. Light and variable wind.

    Low: 47 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 76. Light south wind.

    High: 76 °F

    Sunny

Detailed Forecast

Tonight
Showers and possibly a thunderstorm. Low around 52. North wind around 8 mph. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.
Saturday
Showers and possibly a thunderstorm, mainly before 5pm, then a chance of showers and thunderstorms after 5pm. High near 60. North wind 6 to 8 mph. Chance of precipitation is 90%. New rainfall amounts between a half and three quarters of an inch possible.
Saturday Night
A chance of rain before 3am, then a slight chance of rain after 4am. Patchy fog after 3am. Otherwise, mostly cloudy, with a low around 48. North wind around 5 mph becoming calm in the evening. Chance of precipitation is 50%.
Sunday
Patchy fog before 9am. Otherwise, partly sunny, with a high near 69. Light south southwest wind.
Sunday Night
Mostly clear, with a low around 44. Light south southeast wind.
Monday
Sunny, with a high near 76. South southeast wind 3 to 5 mph.
Monday Night
Mostly clear, with a low around 47. Light and variable wind.
Tuesday
Sunny, with a high near 76. Light south wind.
Tuesday Night
Partly cloudy, with a low around 47.
Wednesday
Sunny, with a high near 76.
Wednesday Night
Mostly clear, with a low around 47.
Thursday
Sunny, with a high near 78.
Thursday Night
Mostly clear, with a low around 47.
Friday
Mostly sunny, with a high near 78.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Toston MT
 46.16°N 111.44°W (Elev. 3999 ft)
Last Update:
3:52 pm MDT Sep 18, 2026
Forecast Valid:
9pm MDT Sep 18, 2026-6pm MDT Sep 25, 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