Mount Gretna Weather Forecast

    • 55
    • 78

    Mostly Sunny

    • 61
    • 83

    Increasing Clouds

    • 71
    • 87

    Partly Sunny

    • 62
    • 83

    Rain Showers Likely

    • 58
    • 77

    Partly Sunny

    • 64
    • 81

    Chance Rain Showers

    • 63
    • 83

    Partly Sunny

Today 7 Sep Lebanon

Sunny. Near steady temperature in the upper 70s. North Winds around 5 Mph.

Tonight 7 Sep Lebanon

Partly cloudy this Evening, then becoming mostly clear. Lows in the mid 50s. Northwest Winds around 5 Mph this Evening, becoming light and variable.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Mount Gretna Temperature Statistics

September Temperature

Lancaster, Lancaster Airport (12.4 miles)

  • Lowest 5 September, 2026

    66 °F

  • Average September

    75.3 °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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