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

Sieben I-15 MP 216 (MTSBN)

Lat: 46.88748267°NLon: 112.1111196°WElev: 4199.0ft.

NA

54°F

12°C

Humidity 52%
Wind Speed ENE 4 MPH
Barometer NA
Dewpoint 37°F (3°C)
Visibility NA
Last update 18 Oct 06:45 PM MDT
Extended Forecast for

Marysville MT

  • Tonight

    Tonight: Partly cloudy, with a low around 40. Light and variable wind becoming northwest around 5 mph after midnight.

    Low: 40 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 61. Southwest wind 5 to 7 mph becoming east southeast in the afternoon.

    High: 61 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 41. Light and variable wind becoming west southwest around 5 mph.

    Low: 41 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 55. Light and variable wind becoming northeast around 6 mph in the afternoon.

    High: 55 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 40. North wind around 6 mph becoming calm after midnight.

    Low: 40 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Sunny, with a high near 61. Calm wind becoming south southeast around 6 mph in the afternoon.

    High: 61 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 45. Calm wind becoming southwest around 5 mph in the evening.

    Low: 45 °F

    Partly Cloudy

  • Thursday

    Thursday: A slight chance of rain after noon. Mostly sunny, with a high near 61. South wind 3 to 6 mph.

    High: 61 °F

    Mostly Sunny
    then Slight
    Chance Rain

  • Thursday Night

    Thursday Night: Rain likely, mainly after midnight. Mostly cloudy, with a low around 42.

    Low: 42 °F

    Rain Likely

Detailed Forecast

Tonight
Partly cloudy, with a low around 40. Light and variable wind becoming northwest around 5 mph after midnight.
Monday
Mostly sunny, with a high near 61. Southwest wind 5 to 7 mph becoming east southeast in the afternoon.
Monday Night
Mostly cloudy, with a low around 41. Light and variable wind becoming west southwest around 5 mph.
Tuesday
Mostly sunny, with a high near 55. Light and variable wind becoming northeast around 6 mph in the afternoon.
Tuesday Night
Partly cloudy, with a low around 40. North wind around 6 mph becoming calm after midnight.
Wednesday
Sunny, with a high near 61. Calm wind becoming south southeast around 6 mph in the afternoon.
Wednesday Night
Partly cloudy, with a low around 45. Calm wind becoming southwest around 5 mph in the evening.
Thursday
A slight chance of rain after noon. Mostly sunny, with a high near 61. South wind 3 to 6 mph.
Thursday Night
Rain likely, mainly after midnight. Mostly cloudy, with a low around 42.
Friday
Rain likely, mainly before noon. Mostly cloudy, with a high near 44. Breezy.
Friday Night
A slight chance of snow. Mostly cloudy, with a low around 30.
Saturday
Mostly sunny, with a high near 41.
Saturday Night
A slight chance of snow. Partly cloudy, with a low around 31.
Sunday
A chance of rain and snow. Partly sunny, with a high near 42.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Marysville MT
 46.75°N 112.29°W (Elev. 5456 ft)
Last Update:
12:31 pm MDT Oct 18, 2026
Forecast Valid:
7pm MDT Oct 18, 2026-6pm MDT Oct 25, 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