Irwin Weather Forecast

    • 33
    • 49

    Rain Showers

    • 32
    • 43

    Mostly Cloudy

    • 33
    • 47

    Rain Showers

    • 39
    • 49

    Rain Showers

    • 41
    • 55

    Rain Showers

    • 17
    • 52

    Snow Showers

Today 23 Dec Westmoreland

Showers, mainly in the morning. Highs in the upper 40s. Southwest Winds 10 to 15 Mph with Gusts up to 25 Mph. Chance of rain near 100 percent.

Tonight 23 Dec Westmoreland

Cloudy. Scattered rain Showers in the evening. Lows in the lower 30s. West Winds 10 to 15 Mph with Gusts up to 25 Mph. Chance of rain 40 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

    28.2 °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 °F

  • Average 2020–2025

    54.6 °F

  • Average High 2020–2025

    63.3 °F
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