Cornwall Weather Forecast

    • 61
    • 70

    Rain Showers Likely

    • 60
    • 83

    Partly Sunny

    • 54
    • 82

    Mostly Sunny

    • 55
    • 76

    Partly Sunny

    • 57
    • 77

    Partly Sunny

    • 61
    • 80

    Partly Sunny

Today 17 Sep Lebanon

Showers likely with a chance of Thunderstorms. Highs in the lower 70s. Northeast Winds around 10 Mph with Gusts up to 20 Mph. Chance of rain 70 percent.

Tonight 17 Sep Lebanon

Mostly cloudy with a chance of Showers and Thunderstorms. Lows in the upper 50s. Northeast Winds 5 to 10 Mph with Gusts up to 20 Mph. Chance of rain 50 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Cornwall Temperature Statistics

September Temperature

Lancaster, Lancaster Airport (11.8 miles)

  • Lowest 8 September, 2025

    48 °F

  • Average September

    67.1 °F

  • Highest 4 September, 2025

    82 °F

Climate (2020–Present)

Lancaster, Lancaster Airport (11.8 miles)

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  • Average Low 2020–2025

    46.3 °F

  • Average 2020–2025

    55.9 °F

  • Average High 2020–2025

    65.6 °F
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