Johnston Weather Forecast

    • 44
    • 62

    Rain Showers

    • 34
    • 52

    Partly Sunny

    • 41
    • 60

    Sunny

    • 47
    • 66

    Partly Sunny

    • 48
    • 69

    Partly Sunny

    • 53
    • 72

    Mostly Sunny

Today 15 Oct Polk

Showers with a slight chance of Thunderstorms. Near steady temperature around 60. Northeast Winds around 5 Mph, increasing to north 15 to 20 Mph with Gusts up to 30 Mph in the afternoon. Chance of rain near 100 percent.

Tonight 15 Oct Polk

Mostly cloudy. A chance of Showers in the evening. Lows in the mid 40s. Northwest Winds 15 to 20 Mph with Gusts up to 30 Mph. Chance of rain 30 percent.

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Johnston Temperature Statistics

October Temperature

Ankeny Regional Airport (6.8 miles)

  • Lowest 5 October, 2026

    42.8 °F

  • Average October

    65.1 °F

  • Highest 11 October, 2026

    87.8 °F

Climate (2021–2026)

Ankeny Regional Airport (6.8 miles)

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  • Average Low 2021–2026

    41.5 °F

  • Average 2021–2026

    52.1 °F

  • Average High 2021–2026

    62.3 °F
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