Walthill Weather Forecast

    • 61
    • 76

    Rain Showers

    • 58
    • 77

    Chance Thunderstorms

    • 55
    • 74

    Chance Thunderstorms

    • 61
    • 77

    Slight Chance Thunderstorms

    • 59
    • 80

    Chance Thunderstorms

    • 54
    • 80

    Slight Chance Thunderstorms

Today 17 Sep Thurston

A chance of Thunderstorms. Showers. Not as warm. Humid with Highs in the mid 70s. South Winds 5 to 10 Mph. Chance of rain 90 percent.

Tonight 17 Sep Thurston

Showers likely with a chance of Thunderstorms. Humid with Lows in the lower 60s. Southeast Winds 5 to 10 Mph. Chance of rain 70 percent.

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Walthill Temperature Statistics

September Temperature

Sioux City, Sioux Gateway Airport (18 miles)

  • Lowest 7 September, 2025

    37.9 °F

  • Average September

    64.6 °F

  • Highest 13 September, 2025

    91.9 °F

Climate (2020–Present)

Sioux City, Sioux Gateway Airport (18 miles)

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  • Average Low 2020–2025

    38.8 °F

  • Average 2020–2025

    50.7 °F

  • Average High 2020–2025

    62.6 °F
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