Parnassus Weather Forecast

    • 56
    • 84

    Rain Showers Likely

    • 50
    • 74

    Mostly Sunny

    • 62
    • 83

    Mostly Sunny

    • 65
    • 86

    Partly Sunny

    • 66
    • 86

    Chance Rain Showers

    • 61
    • 83

    Chance Rain Showers

Today 13 Sep Westmoreland

Partly sunny. Highs in the lower 80s. West Winds 5 to 10 Mph.

Tonight 13 Sep Westmoreland

Mostly cloudy. Showers likely with a chance of Thunderstorms in the Evening, then a slight chance of Showers after midnight. Humid with Lows in the upper 50s. West Winds 5 to 10 Mph, becoming northwest after midnight. Chance of rain 70 percent.

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  • Temperature Real-Time

Parnassus Temperature Statistics

September Temperature

Pittsburgh - Allegheny County Airport (16.2 miles)

  • Lowest 6 September, 2026

    57.9 °F

  • Average September

    73.3 °F

  • Highest 2 September, 2026

    91 °F

Climate (2021–2026)

Pittsburgh - Allegheny County Airport (16.2 miles)

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  • Average Low 2021–2026

    46.1 °F

  • Average 2021–2026

    54.7 °F

  • Average High 2021–2026

    63.3 °F
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