Parnassus Weather Forecast

    • 32
    • 43

    Mostly Cloudy

    • 27
    • 46

    Freezing Rain Likely

    • 36
    • 40

    Rain

    • 36
    • 47

    Rain

    • 23
    • 56

    Rain/Snow Likely

    • 15
    • 31

    Slight Chance Snow

Today 24 Dec Westmoreland

Partly sunny. Highs in the lower 40s. Northwest Winds 5 to 10 Mph.

Tonight 24 Dec Westmoreland

Considerable cloudiness. A chance of rain after midnight. Lows in the lower 30s. Temperatures rising into the upper 30s after midnight. Southeast Winds around 5 Mph. Chance of rain 50 percent.

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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

    28.4 °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 °F

  • Average 2020–2025

    54.6 °F

  • Average High 2020–2025

    63.3 °F
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