Mount Gretna Weather Forecast

    • 59
    • 78

    Rain Showers Likely

    • 62
    • 69

    Rain Showers Likely

    • 60
    • 81

    Mostly Sunny

    • 54
    • 82

    Mostly Sunny

    • 55
    • 76

    Partly Sunny

    • 57
    • 76

    Mostly Cloudy

    • 61
    • 79

    Partly Sunny

Today 16 Sep Lebanon

Mostly cloudy. Highs in the upper 70s. East Winds around 10 Mph with Gusts up to 20 Mph.

Tonight 16 Sep Lebanon

Mostly cloudy. A slight chance of Showers this Evening, then a chance of Showers and Thunderstorms after midnight. Lows in the upper 50s. East Winds 5 to 10 Mph with Gusts up to 20 Mph. Chance of rain 50 percent.

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Mount Gretna Temperature Statistics

September Temperature

Lancaster, Lancaster Airport (12.4 miles)

  • Lowest 8 September, 2025

    48 °F

  • Average September

    67.1 °F

  • Highest 4 September, 2025

    82 °F

Climate (2020–Present)

Lancaster, Lancaster Airport (12.4 miles)

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  • Average Low 2020–2025

    46.3 °F

  • Average 2020–2025

    55.9 °F

  • Average High 2020–2025

    65.6 °F
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