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National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce
7-Day Forecast 41.67°N 93.69°W (Text-Only)
NWS Forecast for: Johnston IA
Issued by: National Weather Service Des Moines, IA
Last Update: 1:26 am CDT Jun 30, 2026		Print

  • Overnight

    Overnight: Partly cloudy, with a low around 77. South southwest wind around 10 mph, with gusts as high as 21 mph.

    Low: 77 °F

    Partly Cloudy



  • Tuesday

    Tuesday: Mostly sunny, with a high near 94. Heat index values as high as 103. South southwest wind 8 to 15 mph, with gusts as high as 25 mph.

    High: 94 °F

    Mostly Sunny



  • Tuesday
    Night

    Tuesday Night: A 30 percent chance of showers and thunderstorms, mainly before 10pm. Mostly cloudy, with a low around 75. South southwest wind 9 to 11 mph, with gusts as high as 21 mph. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 75 °F

    Chance
    T-storms then
    Mostly Cloudy

  • Wednesday

    Wednesday: A 10 percent chance of showers before 7am. Mostly sunny, with a high near 93. Heat index values as high as 101. Breezy, with a south southwest wind 10 to 16 mph, with gusts as high as 26 mph.

    High: 93 °F

    Slight Chance
    Showers then
    Mostly Sunny
    and Breezy

  • Wednesday
    Night

    Wednesday Night: A 40 percent chance of showers and thunderstorms. Partly cloudy, with a low around 75. South southwest wind 9 to 14 mph, with gusts as high as 25 mph. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 75 °F

    Chance
    Showers then
    Chance
    T-storms

  • Thursday

    Thursday: A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 92. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 92 °F

    Chance
    T-storms


  • Thursday
    Night

    Thursday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Partly cloudy, with a low around 73. Chance of precipitation is 60%.

    Low: 73 °F

    Chance
    T-storms then
    Showers
    Likely

  • Friday

    Friday: A 30 percent chance of showers and thunderstorms before 1pm. Mostly sunny, with a high near 93.

    High: 93 °F

    Chance
    T-storms


  • Friday
    Night

    Friday Night: A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 72.

    Low: 72 °F

    Chance
    T-storms




    • Overnight: Partly cloudy, with a low around 77. South southwest wind around 10 mph, with gusts as high as 21 mph.

    Tuesday: Mostly sunny, with a high near 94. Heat index values as high as 103. South southwest wind 8 to 15 mph, with gusts as high as 25 mph.

    Tuesday Night: A 30 percent chance of showers and thunderstorms, mainly before 10pm. Mostly cloudy, with a low around 75. South southwest wind 9 to 11 mph, with gusts as high as 21 mph. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Wednesday: A 10 percent chance of showers before 7am. Mostly sunny, with a high near 93. Heat index values as high as 101. Breezy, with a south southwest wind 10 to 16 mph, with gusts as high as 26 mph.

    Wednesday Night: A 40 percent chance of showers and thunderstorms. Partly cloudy, with a low around 75. South southwest wind 9 to 14 mph, with gusts as high as 25 mph. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Thursday: A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 92. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Thursday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Partly cloudy, with a low around 73. Chance of precipitation is 60%.

    Friday: A 30 percent chance of showers and thunderstorms before 1pm. Mostly sunny, with a high near 93.

    Friday Night: A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 72.

    Independence Day: A 40 percent chance of showers and thunderstorms before 1pm. Mostly sunny, with a high near 92.

    Saturday Night: A 40 percent chance of showers and thunderstorms. Partly cloudy, with a low around 70.

    Sunday: A 40 percent chance of showers and thunderstorms. Partly sunny, with a high near 88.

    Sunday Night: A 30 percent chance of showers. Partly cloudy, with a low around 67.

    Monday: Mostly sunny, with a high near 88.


    Johnston IA
     41.67°N 93.69°W

    Visit your local NWS office at: https://www.weather.gov/desmoines