Johnston Weather Forecast

    • 14
    • 29

    Becoming Sunny

    • 29
    • 36

    Slight Chance Rain/Snow

    • 10
    • 35

    Mostly Cloudy

    • 3
    • 15

    Partly Sunny

    • 10
    • 25

    Partly Sunny

    • 9
    • 23

    Partly Sunny

Today 14 Jan Polk

Partly cloudy and breezy. Much cooler with Highs in the upper 20s. North Winds 15 to 25 Mph with Gusts up to 40 Mph.

Tonight 14 Jan Polk

Mostly clear. Lows around 14. North Winds 10 to 15 Mph, becoming northwest around 5 Mph after midnight.

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Johnston Temperature Statistics

January Temperature

Ankeny Regional Airport (6.8 miles)

  • Lowest 1 January, 2026

    14 °F

  • Average January

    32 °F

  • Highest 7 January, 2026

    60.8 °F

Climate (2021–Present)

Ankeny Regional Airport (6.8 miles)

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  • Average Low 2021–2026

    41.2 °F

  • Average 2021–2026

    51.9 °F

  • Average High 2021–2026

    61.9 °F
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