Mount Gretna Weather Forecast

    • 50
    • 74

    Sunny

    • 55
    • 75

    Mostly Sunny

    • 63
    • 81

    Mostly Sunny

    • 65
    • 85

    Partly Sunny

    • 60
    • 80

    Slight Chance Thunderstorms

    • 61
    • 77

    Chance Rain Showers

Today 14 Sep Lebanon

Sunny. Less humid with Highs in the mid 70s. North Winds 10 to 15 Mph with Gusts up to 30 Mph.

Tonight 14 Sep Lebanon

Partly cloudy. Lows in the lower 60s. Northwest Winds 10 to 15 Mph with Gusts up to 30 Mph.

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  • Temperature Real-Time

Mount Gretna Temperature Statistics

September Temperature

Lancaster, Lancaster Airport (12.4 miles)

  • Lowest 8 September, 2026

    54 °F

  • Average September

    72.9 °F

  • Highest 1 September, 2026

    89.1 °F

Climate (2021–2026)

Lancaster, Lancaster Airport (12.4 miles)

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  • Average Low 2021–2026

    45.8 °F

  • Average 2021–2026

    55.5 °F

  • Average High 2021–2026

    65.1 °F
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