Green Castle Recreation Area Weather Forecast

    • 46
    • 69

    Mostly Sunny

    • 49
    • 72

    Mostly Sunny

    • 55
    • 74

    Partly Sunny

    • 55
    • 79

    Mostly Sunny

    • 55
    • 78

    Partly Sunny

    • 54
    • 76

    Partly Sunny

Today 25 Aug Marshall

Sunny. Near steady temperature in the upper 60s. Northwest Winds around 10 Mph.

Tonight 25 Aug Marshall

Clear. Lows in the mid 40s. Northwest Winds around 5 Mph.

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Green Castle Recreation Area Temperature Statistics

August Temperature

Marshalltown, Marshalltown Municipal Airport (12.4 miles)

  • Lowest 1 August, 2025

    54.6 °F

  • Average August

    73.1 °F

  • Highest 17 August, 2025

    93.7 °F

Climate (2020–Present)

Marshalltown, Marshalltown Municipal Airport (12.4 miles)

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  • Average Low 2020–2025

    39.5 °F

  • Average 2020–2025

    50.1 °F

  • Average High 2020–2025

    60.8 °F
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