Irwin Weather Forecast

    • 55
    • 80

    Partly Sunny

    • 56
    • 84

    Mostly Sunny

    • 54
    • 83

    Mostly Sunny

    • 59
    • 83

    Partly Sunny

    • 59
    • 84

    Partly Sunny

    • 60
    • 85

    Partly Sunny

Today 17 Sep Westmoreland

Partly cloudy. Highs in the upper 70s. Northeast Winds around 5 Mph.

Tonight 17 Sep Westmoreland

Mainly clear. Lows in the mid 50s. East Winds around 5 Mph in the Evening, becoming light and variable.

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Irwin Temperature Statistics

September Temperature

Pittsburgh - Allegheny County Airport (11.2 miles)

  • Lowest 8 September, 2025

    45 °F

  • Average September

    64.8 °F

  • Highest 3 September, 2025

    82 °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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