Green Castle Recreation Area Weather Forecast

    • 63
    • 82

    Increasing Clouds

    • 56
    • 80

    Mostly Sunny

    • 57
    • 73

    Rain Showers Likely

    • 61
    • 84

    Rain Showers

    • 54
    • 72

    Chance Rain Showers

    • 59
    • 73

    Rain Showers Likely

Today 11 Sep Marshall

Sunny. Highs in the lower 80s. South Winds 5 to 10 Mph.

Tonight 11 Sep Marshall

Partly cloudy. A slight chance of Showers and Thunderstorms after midnight. Lows in the mid 60s. South Winds 5 to 10 Mph. Chance of rain 20 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Green Castle Recreation Area Temperature Statistics

September Temperature

Marshalltown, Marshalltown Municipal Airport (12.4 miles)

  • Lowest 9 September, 2026

    62.1 °F

  • Average September

    78.6 °F

  • Highest 2 September, 2026

    93.7 °F

Climate (2021–2026)

Marshalltown, Marshalltown Municipal Airport (12.4 miles)

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  • Average Low 2021–2026

    39.8 °F

  • Average 2021–2026

    50.6 °F

  • Average High 2021–2026

    61.4 °F
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