Thunderstorms and Heavy Rain in the Mid-South; Heat Continues in the Southeast and Southwest

Severe thunderstorms and heavy rain are expected across portions of the mid-Mississippi Valley into the Ohio Valley and portions of Arizona. Dangerous heat persists in the South and Southeast while building into the Southwest. Overnight lows will be so warm that, when combined with oppressive dew points, little-to-no relief from the scorching daytime highs will be available. Read More >

Hazardous Weather Conditions

Current conditions at

Marshalltown, Marshalltown Municipal Airport (KMIW)

Lat: 42.11°NLon: 92.92°WElev: 971ft.

Fair

69°F

21°C

Humidity 96%
Wind Speed Calm
Barometer 29.92 in (1012.6 mb)
Dewpoint 68°F (20°C)
Visibility 10.00 mi
Last update 18 Aug 11:53 pm CDT
Extended Forecast for

3 Miles SE Montour IA

  • Overnight

    Overnight: Patchy fog after 5am.  Otherwise, mostly cloudy, with a low around 62. Calm wind.

    Low: 62 °F

    Patchy Fog

  • Wednesday

    Wednesday: Patchy fog before 9am.  Otherwise, partly sunny, with a high near 80. Calm wind becoming northeast around 5 mph in the afternoon.

    High: 80 °F

    Patchy Fog
    then Partly
    Sunny

  • Wednesday Night

    Wednesday Night: Mostly cloudy, then gradually becoming clear, with a low around 58. Light northeast wind.

    Low: 58 °F

    Decreasing
    Clouds

  • Thursday

    Thursday: Sunny, with a high near 81. Calm wind becoming south around 5 mph in the afternoon.

    High: 81 °F

    Sunny

  • Thursday Night

    Thursday Night: A 30 percent chance of showers and thunderstorms after 1am.  Partly cloudy, with a low around 63. South wind 3 to 5 mph.  New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 63 °F

    Partly Cloudy
    then Chance
    T-storms

  • Friday

    Friday: Sunny, with a high near 83.

    High: 83 °F

    Sunny

  • Friday Night

    Friday Night: A 30 percent chance of showers and thunderstorms, mainly after 1am.  Mostly clear, with a low around 63.

    Low: 63 °F

    Slight Chance
    T-storms then
    Chance
    Showers

  • Saturday

    Saturday: Sunny, with a high near 81.

    High: 81 °F

    Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 59.

    Low: 59 °F

    Partly Cloudy

Detailed Forecast

Overnight
Patchy fog after 5am. Otherwise, mostly cloudy, with a low around 62. Calm wind.
Wednesday
Patchy fog before 9am. Otherwise, partly sunny, with a high near 80. Calm wind becoming northeast around 5 mph in the afternoon.
Wednesday Night
Mostly cloudy, then gradually becoming clear, with a low around 58. Light northeast wind.
Thursday
Sunny, with a high near 81. Calm wind becoming south around 5 mph in the afternoon.
Thursday Night
A 30 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 63. South wind 3 to 5 mph. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Friday
Sunny, with a high near 83.
Friday Night
A 30 percent chance of showers and thunderstorms, mainly after 1am. Mostly clear, with a low around 63.
Saturday
Sunny, with a high near 81.
Saturday Night
Partly cloudy, with a low around 59.
Sunday
Mostly sunny, with a high near 77.
Sunday Night
Partly cloudy, with a low around 58.
Monday
Mostly sunny, with a high near 80.
Monday Night
Partly cloudy, with a low around 61.
Tuesday
Mostly sunny, with a high near 82.
Basemap Options
Click map to change the forecast location
Loading map...

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles SE Montour IA
 41.97°N 92.68°W
11:06 pm CDT Aug 18, 2026
12am CDT Aug 19, 2026-6pm CDT Aug 25, 2026
 
Get as KML Get as XML

Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database