William Penn State Forest Weather Forecast

    • 51
    • 75

    Becoming Sunny

    • 54
    • 76

    Mostly Sunny

    • 61
    • 81

    Mostly Sunny

    • 63
    • 83

    Partly Sunny

    • 60
    • 81

    Partly Sunny

    • 61
    • 78

    Chance Rain Showers

Today 14 Sep Western Chester

Sunny. Less humid with Highs in the mid 70s. North Winds 10 to 15 Mph.

Tonight 14 Sep Western Chester

Clear, cooler with Lows around 50. North Winds 5 to 10 Mph.

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William Penn State Forest Temperature Statistics

September Temperature

Phillips Army Air Field / Aberdeen (18 miles)

  • Lowest 8 September, 2026

    55.9 °F

  • Average September

    78.9 °F

  • Highest 1 September, 2026

    93.2 °F

Climate (2021–2026)

Phillips Army Air Field / Aberdeen (18 miles)

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  • Average Low 2021–2026

    47.5 °F

  • Average 2021–2026

    57.7 °F

  • Average High 2021–2026

    65.1 °F
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