Parnassus Weather Forecast

    • 27
    • 45

    Decreasing Clouds

    • 13
    • 33

    Becoming Sunny

    • 31
    • 39

    Rain

    • 29
    • 50

    Rain Likely

    • 34
    • 42

    Rain

    • 47
    • 56

    Rain Likely

    • 36
    • 56

    Chance Rain

Today 20 Dec Westmoreland

Partly sunny. Highs in the mid 40s. South Winds 5 to 10 Mph.

Tonight 20 Dec Westmoreland

Partly cloudy this Evening, then becoming mostly cloudy. Lows in the upper 20s. Southwest Winds around 10 Mph with Gusts up to 20 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Parnassus Temperature Statistics

December Temperature

Pittsburgh - Allegheny County Airport (16.2 miles)

  • Lowest 15 December, 2025

    7 °F

  • Average December

    27.8 °F

  • Highest 18 December, 2025

    57.9 °F

Climate (2020–Present)

Pittsburgh - Allegheny County Airport (16.2 miles)

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  • Average Low 2020–2025

    46.1 °F

  • Average 2020–2025

    54.6 °F

  • Average High 2020–2025

    63.2 °F
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