Irwin Weather Forecast

    • 20
    • 46

    Snow Showers

    • 21
    • 28

    Chance Snow Showers

    • 18
    • 33

    Snow Showers

    • 15
    • 27

    Chance Snow Showers

    • 18
    • 29

    Mostly Cloudy

    • 17
    • 35

    Chance Rain Showers

Today 29 Dec Westmoreland

Rain Showers likely in the Morning, then snow Showers likely in the afternoon. Little or no snow accumulation. Windy with Highs in the upper 40s. Temperatures falling into the upper 20s in the afternoon. West Winds 20 to 30 Mph with Gusts up to 50 Mph. Chance of precipitation 70 percent.

Tonight 29 Dec Westmoreland

Snow Showers. Patchy blowing snow. Snow accumulation possible. Windy and much Colder with Lows around 20. West Winds 20 to 30 Mph with Gusts up to 45 Mph. Chance of snow 90 percent.

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Irwin Temperature Statistics

December Temperature

Pittsburgh - Allegheny County Airport (11.2 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 (11.2 miles)

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  • Average Low 2020–2025

    46.1 °F

  • Average 2020–2025

    54.6 °F

  • Average High 2020–2025

    63.3 °F
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