South Mountain State Park Weather Forecast

    • 58
    • 78

    Partly Sunny

    • 64
    • 72

    Mostly Cloudy

    • 63
    • 75

    Rain Showers

    • 58
    • 68

    Chance Rain Showers

    • 53
    • 60

    Chance Rain Showers

    • 53
    • 57

    Chance Rain Showers

Today 18 Sep Washington

Mostly cloudy. Highs in the lower 80s. North Winds 5 to 10 Mph.

Tonight 18 Sep Washington

Partly cloudy. Lows in the upper 50s. Northeast Winds 5 to 10 Mph.

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  • Temperature Real-Time

South Mountain State Park Temperature Statistics

September Temperature

Hagerstown, Washington County Regional Airport (12.4 miles)

  • Lowest 15 September, 2026

    50 °F

  • Average September

    74.5 °F

  • Highest 1 September, 2026

    93.7 °F

Climate (2021–2026)

Hagerstown, Washington County Regional Airport (12.4 miles)

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  • Average Low 2021–2026

    47.7 °F

  • Average 2021–2026

    56.8 °F

  • Average High 2021–2026

    66 °F
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