Dangerous Heat in the Southwest; Severe Thunderstorms and Heavy Rain in the Northeast and Mid-Atlantic

Dangerous heat will persist across the Southwest U.S. through Friday with daytime highs of 110-115°F. Heat across the southern Plains will briefly ease to near-normal by late week. Strong to severe thunderstorms may produce damaging wind, hail, a tornado or two, heavy rain and flash flooding across parts of the Mid-Atlantic and Northeast. Heavy rainfall threat continues across the Gulf Coast. Read More >

Current conditions at

Sieben I-15 MP 216 (MTSBN)

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

NA

50°F

10°C

Humidity 89%
Wind Speed ESE 1 MPH
Barometer NA
Dewpoint 47°F (8°C)
Visibility NA
Last update 27 Aug 07:15 AM MDT
Extended Forecast for

Marysville MT

  • Today

    Today: A slight chance of showers and thunderstorms before 2pm, then a slight chance of thunderstorms after 3pm.  Partly sunny, with a high near 80. Light south southwest wind becoming south 5 to 10 mph in the morning. Winds could gust as high as 20 mph.  Chance of precipitation is 20%.

    High: 80 °F

    Partly Sunny
    then Slight
    Chance
    T-storms

  • Tonight

    Tonight: A 30 percent chance of showers and thunderstorms before 9pm.  Patchy smoke after 10pm. Mostly cloudy, then gradually becoming mostly clear, with a low around 55. West southwest wind around 8 mph.

    Low: 55 °F

    Chance
    T-storms then
    Patchy Smoke

  • Friday

    Friday: Patchy smoke before 10am. Cloudy, with a high near 74. Light and variable wind becoming west southwest 5 to 10 mph in the afternoon. Winds could gust as high as 20 mph.

    High: 74 °F

    Patchy Smoke
    then Mostly
    Cloudy

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 57. West southwest wind 6 to 9 mph.

    Low: 57 °F

    Mostly Cloudy

  • Saturday

    Saturday: A chance of showers, then showers likely and possibly a thunderstorm after noon.  Mostly cloudy, with a high near 67. South wind 5 to 10 mph, with gusts as high as 20 mph.  Chance of precipitation is 70%.

    High: 67 °F

    Chance
    Showers then
    Showers
    Likely

  • Saturday Night

    Saturday Night: Showers and possibly a thunderstorm.  Low around 49. West southwest wind 8 to 10 mph.  Chance of precipitation is 80%.

    Low: 49 °F

    Showers

  • Sunday

    Sunday: A 50 percent chance of showers.  Partly sunny, with a high near 60. West southwest wind 11 to 21 mph, with gusts as high as 29 mph.

    High: 60 °F

    Chance
    Showers

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 45. West southwest wind 9 to 16 mph, with gusts as high as 28 mph.

    Low: 45 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 69.

    High: 69 °F

    Sunny

Detailed Forecast

Today
A slight chance of showers and thunderstorms before 2pm, then a slight chance of thunderstorms after 3pm. Partly sunny, with a high near 80. Light south southwest wind becoming south 5 to 10 mph in the morning. Winds could gust as high as 20 mph. Chance of precipitation is 20%.
Tonight
A 30 percent chance of showers and thunderstorms before 9pm. Patchy smoke after 10pm. Mostly cloudy, then gradually becoming mostly clear, with a low around 55. West southwest wind around 8 mph.
Friday
Patchy smoke before 10am. Cloudy, with a high near 74. Light and variable wind becoming west southwest 5 to 10 mph in the afternoon. Winds could gust as high as 20 mph.
Friday Night
Mostly cloudy, with a low around 57. West southwest wind 6 to 9 mph.
Saturday
A chance of showers, then showers likely and possibly a thunderstorm after noon. Mostly cloudy, with a high near 67. South wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 70%.
Saturday Night
Showers and possibly a thunderstorm. Low around 49. West southwest wind 8 to 10 mph. Chance of precipitation is 80%.
Sunday
A 50 percent chance of showers. Partly sunny, with a high near 60. West southwest wind 11 to 21 mph, with gusts as high as 29 mph.
Sunday Night
Mostly clear, with a low around 45. West southwest wind 9 to 16 mph, with gusts as high as 28 mph.
Monday
Sunny, with a high near 69.
Monday Night
Mostly clear, with a low around 52.
Tuesday
Sunny, with a high near 70.
Tuesday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 51.
Wednesday
Mostly sunny, with a high near 65.
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ABOUT THIS FORECAST

 
Point Forecast:
Marysville MT
 46.75°N 112.29°W (Elev. 5456 ft)
4:21 am MDT Aug 27, 2026
7am MDT Aug 27, 2026-6pm MDT Sep 2, 2026
 
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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