Canonsburg Weather Forecast

    • 57
    • 82

    Decreasing Clouds

    • 55
    • 80

    Partly Sunny

    • 57
    • 84

    Mostly Sunny

    • 56
    • 85

    Mostly Sunny

    • 60
    • 85

    Mostly Cloudy

    • 61
    • 85

    Chance Rain Showers

    • 61
    • 84

    Slight Chance Rain Showers

Today 16 Sep Washington

Partly sunny. Near steady temperature around 80. East Winds 5 to 10 Mph.

Tonight 16 Sep Washington

Mostly cloudy this Evening, then becoming partly cloudy. Lows in the upper 50s. East Winds 5 to 10 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Canonsburg Temperature Statistics

September Temperature

Washington - Washington County Airport (9.9 miles)

  • Lowest 8 September, 2025

    39.9 °F

  • Average September

    62 °F

  • Highest 14 September, 2025

    84 °F

Climate (2020–Present)

Washington - Washington County Airport (9.9 miles)

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  • Average Low 2020–2025

    42.5 °F

  • Average 2020–2025

    52.5 °F

  • Average High 2020–2025

    62.5 °F
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