Mount Gretna Weather Forecast

    • 51
    • 60

    Rain

    • 50
    • 63

    Rain

    • 48
    • 53

    Rain

    • 56
    • 68

    Rain Showers Likely

    • 59
    • 74

    Chance Rain Showers

    • 60
    • 77

    Slight Chance Rain Showers

Today 21 May Lebanon

Rain, mainly this morning. Much cooler with Highs in the lower 60s. Northeast Winds 5 to 10 Mph. Chance of rain near 100 percent.

Tonight 21 May Lebanon

Cloudy. Lows around 50. East Winds around 5 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Mount Gretna Temperature Statistics

May Temperature

Lancaster, Lancaster Airport (12.4 miles)

  • Lowest 4 May, 2026

    36 °F

  • Average May

    60.2 °F

  • Highest 18 May, 2026

    93.9 °F

Climate (2021–Present)

Lancaster, Lancaster Airport (12.4 miles)

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  • Average Low 2021–2026

    45.9 °F

  • Average 2021–2026

    55.6 °F

  • Average High 2021–2026

    65.2 °F
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