Cornwall Weather Forecast

    • 63
    • 84

    Chance Rain Showers

    • 50
    • 74

    Mostly Sunny

    • 55
    • 76

    Mostly Sunny

    • 61
    • 81

    Partly Sunny

    • 64
    • 85

    Slight Chance Thunderstorms

    • 60
    • 82

    Chance Rain Showers

Today 13 Sep Lebanon

Mostly cloudy with Showers likely in the Morning, then mostly sunny in the afternoon. Humid with Highs in the mid 80s. Northwest Winds 5 to 10 Mph. Chance of rain 70 percent.

Tonight 13 Sep Lebanon

Showers likely with a chance of Thunderstorms. Near steady temperature in the upper 60s. East Winds around 5 Mph. Chance of rain 70 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, 2026

    54 °F

  • Average September

    73 °F

  • Highest 1 September, 2026

    89.1 °F

Climate (2021–2026)

Lancaster, Lancaster Airport (11.8 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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