Rock Valley Weather Forecast

    • 55
    • 66

    Cloudy

    • 51
    • 66

    Rain Showers

    • 45
    • 58

    Rain Showers

    • 44
    • 63

    Partly Sunny

    • 51
    • 66

    Chance Rain Showers

    • 55
    • 69

    Mostly Cloudy

    • 57
    • 72

    Chance Rain Showers

Today 19 Sep Sioux

Mostly cloudy with a 40 percent chance of Showers. Highs in the lower 70s.

Tonight 19 Sep Sioux

Cloudy. Lows in the mid 50s. Northeast Winds 5 to 10 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Rock Valley Temperature Statistics

September Temperature

Sheldon (23 miles)

  • Lowest 13 September, 2026

    46.4 °F

  • Average September

    69 °F

  • Highest 4 September, 2026

    93.2 °F

Climate (2021–2026)

Sheldon (23 miles)

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  • Average Low 2021–2026

    36.3 °F

  • Average 2021–2026

    47.3 °F

  • Average High 2021–2026

    58.2 °F
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