St. Clair Weather Forecast

    • 43
    • 62

    Rain Showers Likely

    • 43
    • 53

    Chance Rain Showers

    • 38
    • 54

    Rain Showers Likely

    • 37
    • 55

    Partly Sunny

    • 38
    • 57

    Partly Sunny

    • 41
    • 58

    Chance Rain Showers

Today 21 Oct Allegheny

Sunny after Midnight, then mostly sunny with Showers likely this morning. Mostly cloudy with a chance of Showers this afternoon. Highs in the lower 60s. South Winds 10 to 15 Mph with Gusts up to 25 Mph, becoming southwest with Gusts up to 25 Mph this afternoon. Chance of rain 70 percent.

Tonight 21 Oct Allegheny

Showers likely. Lows in the lower 40s. Southwest Winds 10 to 15 Mph with Gusts up to 25 Mph. Chance of rain 70 percent.

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St. Clair Temperature Statistics

October Temperature

Pittsburgh - Allegheny County Airport (4.3 miles)

  • Lowest 17 October, 2025

    39 °F

  • Average October

    59.2 °F

  • Highest 6 October, 2025

    81 °F

Climate (2020–Present)

Pittsburgh - Allegheny County Airport (4.3 miles)

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  • Average Low 2020–2025

    46.2 °F

  • Average 2020–2025

    54.8 °F

  • Average High 2020–2025

    63.4 °F
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