Mount Gretna Weather Forecast

    • 66
    • 84

    Rain Showers Likely

    • 54
    • 79

    Mostly Sunny

    • 61
    • 75

    Mostly Cloudy

    • 60
    • 76

    Rain Showers

    • 59
    • 71

    Chance Rain Showers

    • 57
    • 69

    Chance Rain Showers

Today 17 Sep Lebanon

Mostly cloudy. Patchy fog in the morning. A chance of Showers in the Morning, then Showers likely with a chance of Thunderstorms in the afternoon. Very warm. Humid with Highs in the mid 80s. South Winds 5 to 10 Mph. Chance of rain 60 percent.

Tonight 17 Sep Lebanon

Mostly cloudy. Showers likely with a chance of Thunderstorms in the evening. Humid with Lows in the mid 60s. Southwest Winds around 5 Mph, becoming northwest after midnight. Chance of rain 60 percent.

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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

    72.3 °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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