Parnassus Weather Forecast

    • 27
    • 48

    Chance Rain

    • 35
    • 41

    Rain

    • 34
    • 44

    Mostly Cloudy

    • 27
    • 57

    Rain

    • 19
    • 39

    Chance Snow

    • 20
    • 29

    Mostly Cloudy

Today 25 Dec Westmoreland

Considerable cloudiness with a chance of rain this Morning, then partly sunny this afternoon. Highs in the upper 40s. West Winds around 5 Mph, becoming northwest this afternoon. Chance of rain 50 percent.

Tonight 25 Dec Westmoreland

Partly cloudy in the Evening, then becoming mostly cloudy. Lows in the upper 20s. Northeast Winds around 5 Mph.

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Parnassus Temperature Statistics

December Temperature

Pittsburgh - Allegheny County Airport (16.2 miles)

  • Lowest 15 December, 2025

    7 °F

  • Average December

    28.5 °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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