Mount Gretna Weather Forecast

    • 58
    • 72

    Mostly Cloudy

    • 59
    • 77

    Mostly Cloudy

    • 61
    • 81

    Partly Sunny

    • 58
    • 83

    Chance Rain Showers

    • 54
    • 71

    Rain Showers Likely

    • 51
    • 67

    Rain Showers Likely

Today 29 Sep Lebanon

Mostly cloudy this Morning, then becoming partly sunny. Highs in the lower 70s. Northwest Winds 5 to 10 Mph.

Tonight 29 Sep Lebanon

Partly cloudy. Areas of fog after midnight. Lows in the upper 50s. Northwest Winds around 5 Mph in the Evening, becoming light and variable.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Mount Gretna Temperature Statistics

September Temperature

Lancaster, Lancaster Airport (12.4 miles)

  • Lowest 24 September, 2026

    46.9 °F

  • Average September

    68.3 °F

  • Highest 1 September, 2026

    89.1 °F

Climate (2021–2026)

Lancaster, Lancaster Airport (12.4 miles)

Take a look at our website widgetsAvailable free! Find Out More

  • Average Low 2021–2026

    45.8 °F

  • Average 2021–2026

    55.5 °F

  • Average High 2021–2026

    65 °F
Get WillyWeather+ to remove ads