Parnassus Weather Forecast

    • 41
    • 59

    Rain

    • 20
    • 46

    Snow Showers

    • 21
    • 29

    Snow Showers

    • 21
    • 34

    Snow Likely

    • 13
    • 29

    Chance Snow

    • 17
    • 28

    Partly Sunny

Today 28 Dec Westmoreland

Rain, mild. Highs in the upper 50s. South Winds 5 to 10 Mph. Chance of rain 90 percent.

Tonight 28 Dec Westmoreland

A chance of rain in the Evening, then rain after midnight. Mild. Lows in the lower 40s. Southwest Winds 15 to 20 Mph. Gusts up to 30 Mph, increasing to 40 Mph after midnight. Chance of rain near 100 percent.

Graph Plots Open in Graphs

  • 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

    30.3 °F

  • Highest 18 December, 2025

    57.9 °F

Climate (2020–Present)

Pittsburgh - Allegheny County Airport (16.2 miles)

Take a look at our website widgetsAvailable free! Find Out More

  • Average Low 2020–2025

    46.1 °F

  • Average 2020–2025

    54.6 °F

  • Average High 2020–2025

    63.3 °F
Get WillyWeather+ to remove ads