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 >

Current conditions at

Marshalltown, Marshalltown Municipal Airport (KMIW)

Lat: 42.11°NLon: 92.92°WElev: 971ft.

Overcast

75°F

24°C

Humidity 90%
Wind Speed Calm
Barometer 29.94 in (1013.1 mb)
Dewpoint 72°F (22°C)
Visibility 10.00 mi
Last update 26 Jul 8:53 am CDT
Extended Forecast for

2 Miles S Union IA

Extreme Heat Watch July 27, 12:00pm until July 27, 08:00pm
Click here for hazard details and duration
Extreme Heat Watch
  • Today

    Today: A 20 percent chance of showers and thunderstorms before 10am.  Patchy fog before 10am.  Otherwise, partly sunny, with a high near 84. South wind around 6 mph.

    High: 84 °F

    Slight Chance
    T-storms and
    Patchy Fog
    then Mostly
    Sunny

  • Tonight

    Tonight: Patchy fog after 5am.  Otherwise, increasing clouds, with a low around 69. Light south southeast wind.

    Low: 69 °F

    Mostly Clear
    then Patchy
    Fog

  • Sunday

    Sunday: Patchy fog before 9am.  Otherwise, mostly cloudy, then gradually becoming sunny, with a high near 89. Heat index values as high as 102. Calm wind becoming south 5 to 7 mph in the morning.

    High: 89 °F

    Patchy Fog
    then Sunny

  • Sunday Night

    Sunday Night: A 20 percent chance of showers and thunderstorms after 1am.  Mostly clear, with a low around 73. South wind around 6 mph.

    Low: 73 °F

    Mostly Clear
    then Slight
    Chance
    T-storms

  • Monday

    Monday: Sunny, with a high near 93. 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.

    Low: 72 °F

    Mostly Clear
    then Slight
    Chance
    T-storms

  • Tuesday

    Tuesday: A 30 percent chance of showers and thunderstorms, mainly after 1pm.  Mostly sunny, with a high near 90.

    High: 90 °F

    Chance
    T-storms

  • Tuesday Night

    Tuesday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am.  Mostly cloudy, with a low around 67. Chance of precipitation is 60%.

    Low: 67 °F

    Chance
    T-storms then
    Showers
    Likely

  • Wednesday

    Wednesday: A 50 percent chance of showers and thunderstorms.  Mostly cloudy, with a high near 79.

    High: 79 °F

    Chance
    T-storms

Detailed Forecast

Today
A 20 percent chance of showers and thunderstorms before 10am. Patchy fog before 10am. Otherwise, partly sunny, with a high near 84. South wind around 6 mph.
Tonight
Patchy fog after 5am. Otherwise, increasing clouds, with a low around 69. Light south southeast wind.
Sunday
Patchy fog before 9am. Otherwise, mostly cloudy, then gradually becoming sunny, with a high near 89. Heat index values as high as 102. 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 73. South wind around 6 mph.
Monday
Sunny, with a high near 93. Southwest wind around 7 mph.
Monday Night
A 20 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 72.
Tuesday
A 30 percent chance of showers and thunderstorms, mainly after 1pm. Mostly sunny, with a high near 90.
Tuesday Night
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 67. Chance of precipitation is 60%.
Wednesday
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 79.
Wednesday Night
A 30 percent chance of showers and thunderstorms before 1am. Mostly cloudy, with a low around 61.
Thursday
Mostly sunny, with a high near 75.
Thursday Night
Mostly cloudy, with a low around 57.
Friday
Mostly sunny, with a high near 74.
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ABOUT THIS FORECAST

 
Point Forecast:
2 Miles S Union IA
 42.21°N 93.06°W
9:21 am CDT Jul 26, 2025
9am CDT Jul 26, 2025-6pm CDT Aug 1, 2025
 
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