Widespread Showers in the Eastern US; Severe Thunderstorms in the Plains; Heatwave in the Desert Southwest

Widespread showers and thunderstorms across much of the central and eastern U.S. will produce areas of excessive rainfall, especially in the southern Mid-Atlantic states. Scattered severe thunderstorms are expected from Montana into portions of the central/southern Plains this weekend. A heatwave will build in the Desert Southwest, in parts of Arizona, southeastern California, and southern Nevada. Read More >

Hazardous Weather Conditions

Current conditions at

Marshalltown, Marshalltown Municipal Airport (KMIW)

Lat: 42.11°NLon: 92.92°WElev: 971ft.

Light Rain

67°F

19°C

Humidity 97%
Wind Speed SW 6 mph
Barometer 30.04 in (1016.4 mb)
Dewpoint 66°F (19°C)
Visibility 10.00 mi
Last update 15 Jun 4:53 am CDT
Extended Forecast for

Union IA

  • Overnight

    Overnight: A 30 percent chance of showers and thunderstorms.  Mostly cloudy, with a low around 66. East southeast wind around 5 mph.  New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 66 °F

    Chance
    T-storms

  • Sunday

    Sunday: A 40 percent chance of showers and thunderstorms.  Mostly cloudy, with a high near 83. Calm wind becoming south around 6 mph in the afternoon.  New rainfall amounts between a quarter and half of an inch possible.

    High: 83 °F

    Chance
    T-storms

  • Sunday Night

    Sunday Night: A 50 percent chance of showers and thunderstorms.  Mostly cloudy, with a low around 66. South southeast wind around 6 mph.  New rainfall amounts between a quarter and half of an inch possible.

    Low: 66 °F

    Chance
    T-storms

  • Monday

    Monday: A 20 percent chance of showers and thunderstorms.  Partly sunny, with a high near 87. South wind 5 to 9 mph.

    High: 87 °F

    Slight Chance
    T-storms

  • Monday Night

    Monday Night: A 50 percent chance of showers and thunderstorms.  Mostly cloudy, with a low around 68. South wind 6 to 9 mph.  New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 68 °F

    Chance
    T-storms

  • Tuesday

    Tuesday: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm.  Partly sunny, with a high near 85. Chance of precipitation is 60%. New rainfall amounts between three quarters and one inch possible.

    High: 85 °F

    Chance
    T-storms then
    Showers
    Likely

  • Tuesday Night

    Tuesday Night: Showers and possibly a thunderstorm before 1am, then showers and thunderstorms likely after 1am.  Low around 64. Chance of precipitation is 80%.

    Low: 64 °F

    T-storms

  • Wednesday

    Wednesday: A 50 percent chance of showers and thunderstorms.  Partly sunny, with a high near 80.

    High: 80 °F

    Chance
    T-storms

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 61.

    Low: 61 °F

    Mostly Clear

Detailed Forecast

Overnight
A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 66. East southeast wind around 5 mph. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Sunday
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 83. Calm wind becoming south around 6 mph in the afternoon. New rainfall amounts between a quarter and half of an inch possible.
Sunday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 66. South southeast wind around 6 mph. New rainfall amounts between a quarter and half of an inch possible.
Monday
A 20 percent chance of showers and thunderstorms. Partly sunny, with a high near 87. South wind 5 to 9 mph.
Monday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 68. South wind 6 to 9 mph. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Tuesday
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Partly sunny, with a high near 85. Chance of precipitation is 60%. New rainfall amounts between three quarters and one inch possible.
Tuesday Night
Showers and possibly a thunderstorm before 1am, then showers and thunderstorms likely after 1am. Low around 64. Chance of precipitation is 80%.
Wednesday
A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 80.
Wednesday Night
Mostly clear, with a low around 61.
Juneteenth
Sunny, with a high near 85.
Thursday Night
Mostly clear, with a low around 64.
Friday
Sunny, with a high near 90. Breezy.
Friday Night
Mostly clear, with a low around 73.
Saturday
Sunny, with a high near 92. Breezy.
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ABOUT THIS FORECAST

 
Point Forecast:
Union IA
 42.26°N 93.06°W
4:34 am CDT Jun 15, 2025
5am CDT Jun 15, 2025-6pm CDT Jun 21, 2025
 
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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