Finleyville Weather Forecast

    • 58
    • 81

    Mostly Cloudy

    • 55
    • 79

    Partly Sunny

    • 57
    • 83

    Mostly Sunny

    • 56
    • 84

    Mostly Sunny

    • 61
    • 84

    Partly Sunny

    • 61
    • 84

    Partly Sunny

    • 61
    • 84

    Partly Sunny

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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Finleyville Temperature Statistics

September Temperature

Pittsburgh - Allegheny County Airport (8.1 miles)

  • Lowest 8 September, 2025

    45 °F

  • Average September

    64.8 °F

  • Highest 3 September, 2025

    82 °F

Climate (2020–Present)

Pittsburgh - Allegheny County Airport (8.1 miles)

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  • Average Low 2020–2025

    46.1 °F

  • Average 2020–2025

    54.6 °F

  • Average High 2020–2025

    63.3 °F
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