Mount Gretna Weather Forecast

    • 60
    • 81

    Slight Chance Rain Showers

    • 68
    • 80

    Rain Showers

    • 63
    • 83

    Slight Chance Thunderstorms

    • 55
    • 77

    Partly Sunny

    • 61
    • 77

    Partly Sunny

    • 65
    • 84

    Chance Rain Showers

Today 11 Sep Lebanon

Mostly sunny. A slight chance of Showers in the morning. Highs in the lower 80s. North Winds around 5 Mph. Chance of rain 20 percent.

Tonight 11 Sep Lebanon

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

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Mount Gretna Temperature Statistics

September Temperature

Lancaster, Lancaster Airport (12.4 miles)

  • Lowest 8 September, 2026

    54 °F

  • Average September

    72.4 °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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