Mount Gretna Weather Forecast

    • 63
    • 87

    Slight Chance Thunderstorms

    • 68
    • 93

    Mostly Sunny

    • 69
    • 94

    Partly Sunny

    • 55
    • 87

    Rain Showers

    • 51
    • 70

    Chance Rain Showers

    • 51
    • 66

    Chance Rain Showers

Today 17 May Lebanon

Mostly sunny. A slight chance of Showers and Thunderstorms this afternoon. Hot with Highs in the upper 80s. West Winds 5 to 10 Mph. Chance of rain 20 percent.

Tonight 17 May Lebanon

Partly cloudy. Lows in the lower 60s. Southwest Winds around 5 Mph in the Evening, becoming light and variable.

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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

    56.3 °F

  • Highest 5 May, 2026

    82 °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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