Mount Gretna Weather Forecast

    • 54
    • 85

    Rain Showers

    • 50
    • 65

    Rain Showers Likely

    • 48
    • 62

    Rain

    • 49
    • 56

    Rain

    • 55
    • 64

    Chance Rain Showers

    • 59
    • 74

    Chance Rain Showers

Today 20 May Lebanon

Mostly sunny with a slight chance of Showers this Morning, then mostly cloudy with Showers with a chance of Thunderstorms this afternoon. Very warm with Highs in the mid 80s. Temperature falling to around 80 this afternoon. West Winds 5 to 10 Mph. Chance of rain 80 percent.

Tonight 20 May Lebanon

Mostly cloudy. Showers likely with a chance of Thunderstorms in the Evening, then a chance of Showers after midnight. Cooler with Lows in the lower 50s. North Winds 5 to 10 Mph with Gusts up to 20 Mph. Chance of rain 70 percent.

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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

    57.9 °F

  • Highest 17 May, 2026

    84.9 °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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