Parnassus Weather Forecast

    • 65
    • 75

    Rain Showers

    • 54
    • 79

    Rain Showers

    • 54
    • 71

    Rain Showers Likely

    • 52
    • 67

    Rain Showers Likely

    • 51
    • 64

    Chance Rain Showers

    • 49
    • 66

    Slight Chance Rain Showers

    • 49
    • 71

    Partly Sunny

Today 19 Sep Westmoreland

Partly cloudy. Highs around 70.

Tonight 19 Sep Westmoreland

Mostly cloudy. A slight chance of Showers this Evening, then Showers with a slight chance of Thunderstorms after midnight. Warm with Lows in the mid 60s. Southeast Winds 5 to 10 Mph. Chance of rain 90 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Parnassus Temperature Statistics

September Temperature

Pittsburgh - Allegheny County Airport (16.2 miles)

  • Lowest 15 September, 2026

    53.1 °F

  • Average September

    72.2 °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 °F

  • Average 2021–2026

    54.6 °F

  • Average High 2021–2026

    63.3 °F
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