Heat Wave Expands to the East Coast; Flash Flooding Likely in the Central Plains into the Midwest; Severe Thunderstorms in the Northeast

Dangerous, prolonged heat is ongoing in the Mid-South to Mid-Mississippi Valley and heat expands into the Northeast for a brief period today. Widely scattered instances of flash flooding due to heavy rains are forecast from northeast Kansas to much of Indiana. Scattered strong to severe thunderstorms are possible across parts of New England, northern Mid-Atlantic, and North Dakota. Read More >

Hazardous Weather Conditions

Current conditions at

Marshalltown, Marshalltown Municipal Airport (KMIW)

Lat: 42.11°NLon: 92.92°WElev: 971ft.

Fair

72°F

22°C

Humidity 97%
Wind Speed NE 3 mph
Barometer 29.97 in (1014.3 mb)
Dewpoint 71°F (22°C)
Visibility 8.00 mi
Last update 27 Jul 12:53 am CDT
Extended Forecast for

4 Miles NW Garwin IA

  • Overnight

    Overnight: Patchy fog after 3am.  Otherwise, partly cloudy, with a steady temperature around 73. Calm wind.

    Low: 73 °F

    Patchy Fog

  • Sunday

    Sunday: Widespread dense fog, mainly before 8am.  Otherwise, mostly cloudy, then gradually becoming sunny, with a high near 89. Calm wind becoming south 5 to 7 mph in the morning.

    High: 89 °F

    Dense Fog
    then Mostly
    Sunny

  • Sunday Night

    Sunday Night: A 20 percent chance of showers and thunderstorms after 1am.  Mostly clear, with a low around 74. South wind around 6 mph.

    Low: 74 °F

    Mostly Clear
    then Slight
    Chance
    T-storms

  • Monday

    Monday: Sunny, with a high near 93. Heat index values as high as 109. West southwest wind around 7 mph.

    High: 93 °F

    Sunny

  • Monday Night

    Monday Night: A 20 percent chance of showers and thunderstorms after 1am.  Partly cloudy, with a low around 72. South southeast wind 3 to 5 mph.

    Low: 72 °F

    Mostly Clear
    then Slight
    Chance
    T-storms

  • Tuesday

    Tuesday: A slight chance of showers and thunderstorms before 10am, then a slight chance of showers between 10am and 1pm, then a slight chance of showers and thunderstorms after 1pm.  Mostly sunny, with a high near 91. Chance of precipitation is 20%.

    High: 91 °F

    Slight Chance
    T-storms

  • Tuesday Night

    Tuesday Night: Showers and thunderstorms likely, mainly after 1am.  Mostly cloudy, with a low around 68. Chance of precipitation is 60%.

    Low: 68 °F

    Chance
    T-storms then
    T-storms
    Likely

  • Wednesday

    Wednesday: Showers likely and possibly a thunderstorm before 1pm, then a chance of showers and thunderstorms after 1pm.  Mostly cloudy, with a high near 79. Chance of precipitation is 60%.

    High: 79 °F

    Showers
    Likely

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 60.

    Low: 60 °F

    Mostly Cloudy

Detailed Forecast

Overnight
Patchy fog after 3am. Otherwise, partly cloudy, with a steady temperature around 73. Calm wind.
Sunday
Widespread dense fog, mainly before 8am. Otherwise, mostly cloudy, then gradually becoming sunny, with a high near 89. Calm wind becoming south 5 to 7 mph in the morning.
Sunday Night
A 20 percent chance of showers and thunderstorms after 1am. Mostly clear, with a low around 74. South wind around 6 mph.
Monday
Sunny, with a high near 93. Heat index values as high as 109. West southwest wind around 7 mph.
Monday Night
A 20 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 72. South southeast wind 3 to 5 mph.
Tuesday
A slight chance of showers and thunderstorms before 10am, then a slight chance of showers between 10am and 1pm, then a slight chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 91. Chance of precipitation is 20%.
Tuesday Night
Showers and thunderstorms likely, mainly after 1am. Mostly cloudy, with a low around 68. Chance of precipitation is 60%.
Wednesday
Showers likely and possibly a thunderstorm before 1pm, then a chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 79. Chance of precipitation is 60%.
Wednesday Night
Mostly cloudy, with a low around 60.
Thursday
Mostly sunny, with a high near 76.
Thursday Night
Partly cloudy, with a low around 57.
Friday
Partly sunny, with a high near 75.
Friday Night
Mostly cloudy, with a low around 57.
Saturday
Partly sunny, with a high near 74.
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ABOUT THIS FORECAST

 
Point Forecast:
4 Miles NW Garwin IA
 42.12°N 92.74°W
10:50 pm CDT Jul 26, 2025
1am CDT Jul 27, 2025-6pm CDT Aug 2, 2025
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database