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

Marshalltown, Marshalltown Municipal Airport (KMIW)

Lat: 42.11°NLon: 92.92°WElev: 971ft.

Fair

78°F

26°C

Humidity 58%
Wind Speed Vrbl 7 mph
Barometer 30.10 in (1018.9 mb)
Dewpoint 62°F (17°C)
Visibility 10.00 mi
Heat Index80°F (27°C)
Last update 27 Aug 11:53 am CDT
Extended Forecast for

Grundy Center IA

  • This Afternoon

    This Afternoon: Sunny, with a high near 81. North northwest wind around 8 mph.

    High: 81 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 57. Calm wind.

    Low: 57 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 83. Light and variable wind.

    High: 83 °F

    Sunny

  • Friday Night

    Friday Night: Partly cloudy during the early evening, then becoming cloudy, with a low around 65. Light south southeast wind becoming south 5 to 10 mph in the evening.

    Low: 65 °F

    Becoming
    Cloudy

  • Saturday

    Saturday: A chance of showers, with thunderstorms also possible after 4pm.  Partly sunny, with a high near 83. Breezy, with a south wind 11 to 17 mph, with gusts as high as 25 mph.  Chance of precipitation is 50%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 83 °F

    Chance
    Showers and
    Breezy

  • Saturday Night

    Saturday Night: A slight chance of thunderstorms before 7pm.  Partly cloudy, with a low around 71. Breezy.  Chance of precipitation is 10%.

    Low: 71 °F

    Breezy.
    Slight Chance
    T-storms then
    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 90. Breezy.

    High: 90 °F

    Mostly Sunny
    and Breezy
    then Mostly
    Sunny

  • Sunday Night

    Sunday Night: A 40 percent chance of showers and thunderstorms after 1am.  Partly cloudy, with a low around 73.

    Low: 73 °F

    Partly Cloudy
    then Chance
    Showers

  • Monday

    Monday: Mostly sunny, with a high near 88.

    High: 88 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
Sunny, with a high near 81. North northwest wind around 8 mph.
Tonight
Mostly clear, with a low around 57. Calm wind.
Friday
Sunny, with a high near 83. Light and variable wind.
Friday Night
Partly cloudy during the early evening, then becoming cloudy, with a low around 65. Light south southeast wind becoming south 5 to 10 mph in the evening.
Saturday
A chance of showers, with thunderstorms also possible after 4pm. Partly sunny, with a high near 83. Breezy, with a south wind 11 to 17 mph, with gusts as high as 25 mph. Chance of precipitation is 50%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Saturday Night
A slight chance of thunderstorms before 7pm. Partly cloudy, with a low around 71. Breezy. Chance of precipitation is 10%.
Sunday
Mostly sunny, with a high near 90. Breezy.
Sunday Night
A 40 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 73.
Monday
Mostly sunny, with a high near 88.
Monday Night
A 40 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 70.
Tuesday
A 30 percent chance of showers. Partly sunny, with a high near 86.
Tuesday Night
A 30 percent chance of showers. Partly cloudy, with a low around 68.
Wednesday
Mostly sunny, with a high near 86.
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ABOUT THIS FORECAST

 
Point Forecast:
Grundy Center IA
 42.36°N 92.76°W
10:02 am CDT Aug 27, 2026
12pm CDT Aug 27, 2026-6pm CDT Sep 2, 2026
 
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Additional Resources

Radar & Satellite Image

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Hourly Weather Forecast

National Digital Forecast Database