Johnston Weather Forecast

    • 68
    • 87

    Chance Thunderstorms

    • 66
    • 86

    Rain Showers

    • 61
    • 79

    Chance Thunderstorms

    • 67
    • 86

    Slight Chance Thunderstorms

    • 76
    • 90

    Mostly Sunny

    • 75
    • 93

    Sunny

Today 16 Jun Polk

Mostly sunny. Highs in the upper 80s. South Winds 5 to 10 Mph.

Tonight 16 Jun Polk

Partly cloudy in the Evening, then becoming mostly cloudy. A chance of Showers and Thunderstorms. Humid with Lows in the upper 60s. South Winds 5 to 10 Mph. Chance of rain 40 percent.

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Johnston Temperature Statistics

June Temperature

Ankeny Regional Airport (6.8 miles)

  • Lowest 10 June, 2025

    50 °F

  • Average June

    69.7 °F

  • Highest 11 June, 2025

    93.2 °F

Climate (2020–Present)

Ankeny Regional Airport (6.8 miles)

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  • Average Low 2020–2025

    40.9 °F

  • Average 2020–2025

    51.6 °F

  • Average High 2020–2025

    61.7 °F
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