Irwin Weather Forecast

    • 27
    • 37

    Mostly Cloudy

    • 19
    • 38

    Chance Rain/Snow

    • 12
    • 28

    Partly Sunny

    • 30
    • 36

    Rain Likely

    • 26
    • 41

    Rain/Snow

    • 21
    • 33

    Snow Likely

Today 6 Dec Westmoreland

Considerable cloudiness. Highs in the upper 30s. Southwest Winds 10 to 15 Mph.

Tonight 6 Dec Westmoreland

Considerable cloudiness. Lows in the upper 20s. Southwest Winds 5 to 10 Mph.

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Irwin Temperature Statistics

December Temperature

Pittsburgh - Allegheny County Airport (11.2 miles)

  • Lowest 3 December, 2025

    27 °F

  • Average December

    29.2 °F

  • Highest 1 December, 2025

    32 °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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