Mount Gretna Weather Forecast

    • 58
    • 77

    Rain Showers

    • 52
    • 69

    Chance Rain Showers

    • 51
    • 59

    Rain Showers Likely

    • 50
    • 62

    Chance Rain Showers

    • 50
    • 62

    Slight Chance Rain Showers

    • 50
    • 66

    Chance Rain Showers

Today 20 Sep Lebanon

Rain with a slight chance of Thunderstorms in the Morning, then Showers with a chance of Thunderstorms in the afternoon. Humid with Highs in the upper 70s. South Winds 10 to 15 Mph, becoming southwest 5 to 10 Mph in the afternoon. Chance of rain near 100 percent.

Tonight 20 Sep Lebanon

Mostly cloudy with Showers likely in the Evening, then partly cloudy after midnight. Humid with Lows in the mid 50s. Northwest Winds 5 to 10 Mph. Chance of rain 70 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Mount Gretna Temperature Statistics

September Temperature

Lancaster, Lancaster Airport (12.4 miles)

  • Lowest 15 September, 2026

    48 °F

  • Average September

    71.7 °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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