Irwin Weather Forecast

    • 33
    • 55

    Rain

    • 21
    • 40

    Snow Showers

    • 29
    • 47

    Chance Rain

    • 17
    • 36

    Partly Sunny

    • 26
    • 35

    Chance Snow

    • 33
    • 43

    Chance Rain

Today 18 Dec Westmoreland

Mostly sunny. Mild. Highs in the mid 50s. South Winds 10 to 15 Mph with Gusts up to 25 Mph.

Tonight 18 Dec Westmoreland

Rain likely in the Evening, then rain with snow likely after midnight. Little or no snow accumulation. Lows in the lower 30s. South Winds 15 to 20 Mph, becoming southwest after midnight. Gusts up to 35 Mph. Chance of precipitation near 100 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

    25.7 °F

  • Highest 10 December, 2025

    43 °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

    63.2 °F
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