Irwin Weather Forecast

    • 26
    • 35

    Partly Sunny

    • 24
    • 42

    Mostly Cloudy

    • 26
    • 53

    Rain Showers

    • 20
    • 33

    Mostly Cloudy

    • 31
    • 45

    Chance Rain Showers

    • 26
    • 41

    Chance Rain Showers

Today 16 Dec Westmoreland

Mostly sunny. Highs in the mid 30s. Southwest Winds 5 to 10 Mph.

Tonight 16 Dec Westmoreland

Mainly clear in the Evening, then becoming mostly cloudy. Lows in the mid 20s. Temperatures rising into the mid 30s after midnight. Southwest Winds 10 to 15 Mph with Gusts up to 25 Mph.

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Irwin Temperature Statistics

December Temperature

Pittsburgh - Allegheny County Airport (11.2 miles)

  • Lowest 9 December, 2025

    12.9 °F

  • Average December

    27.6 °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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