National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

Ankeny Regional Airport (KIKV)

Lat: 41.69°NLon: 93.57°WElev: 886ft.

Fair

79°F

26°C

Humidity 84%
Wind Speed S 5 mph
Barometer 29.83 in
Dewpoint 73°F (23°C)
Visibility 10.00 mi
Heat Index83°F (28°C)
Last update 30 Aug 11:15 pm CDT
Extended Forecast for

Johnston IA

Heat Advisory August 31, 01:00pm until September 2, 07:00pm
Click here for hazard details and duration
Heat Advisory

  • Tonight

    Tonight: Partly cloudy, with a low around 74. South wind 5 to 7 mph.

    Low: 74 °F

    Partly Cloudy

  • Monday

    Monday: A 20 percent chance of showers and thunderstorms after 10am. Partly sunny, with a high near 94. Heat index values as high as 105. South southwest wind around 7 mph.

    High: 94 °F

    Slight Chance
    T-storms

  • Monday Night

    Monday Night: A slight chance of showers and thunderstorms between 1am and 4am. Increasing clouds, with a low around 74. Light and variable wind. Chance of precipitation is 20%.

    Low: 74 °F

    Partly Cloudy
    then Slight
    Chance
    T-storms

  • Tuesday

    Tuesday: Mostly sunny, with a high near 94. Heat index values as high as 101. Calm wind becoming south southeast around 5 mph in the afternoon.

    High: 94 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 75. East wind around 6 mph becoming south after midnight.

    Low: 75 °F

    Mostly Clear

  • Wednesday

    Wednesday: Mostly sunny, with a high near 94.

    High: 94 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: A 30 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 74.

    Low: 74 °F

    Partly Cloudy
    then Chance
    T-storms

  • Thursday

    Thursday: A 30 percent chance of showers and thunderstorms before 1pm. Mostly sunny, with a high near 91.

    High: 91 °F

    Chance
    T-storms

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 73.

    Low: 73 °F

    Partly Cloudy

Detailed Forecast

Tonight
Partly cloudy, with a low around 74. South wind 5 to 7 mph.
Monday
A 20 percent chance of showers and thunderstorms after 10am. Partly sunny, with a high near 94. Heat index values as high as 105. South southwest wind around 7 mph.
Monday Night
A slight chance of showers and thunderstorms between 1am and 4am. Increasing clouds, with a low around 74. Light and variable wind. Chance of precipitation is 20%.
Tuesday
Mostly sunny, with a high near 94. Heat index values as high as 101. Calm wind becoming south southeast around 5 mph in the afternoon.
Tuesday Night
Mostly clear, with a low around 75. East wind around 6 mph becoming south after midnight.
Wednesday
Mostly sunny, with a high near 94.
Wednesday Night
A 30 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 74.
Thursday
A 30 percent chance of showers and thunderstorms before 1pm. Mostly sunny, with a high near 91.
Thursday Night
Partly cloudy, with a low around 73.
Friday
Mostly sunny, with a high near 91.
Friday Night
Partly cloudy, with a low around 70.
Saturday
Mostly sunny, with a high near 91.
Saturday Night
Mostly clear, with a low around 69.
Sunday
Mostly sunny, with a high near 88.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Johnston IA
 41.72°N 93.68°W
Last Update:
10:43 pm CDT Aug 30, 2026
Forecast Valid:
11pm CDT Aug 30, 2026-6pm CDT Sep 6, 2026
 
Forecast Discussion
 
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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

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation