Irwin Weather Forecast

    • 60
    • 81

    Increasing Clouds

    • 67
    • 86

    Partly Sunny

    • 67
    • 85

    Rain Showers

    • 61
    • 80

    Mostly Cloudy

    • 66
    • 81

    Chance Rain Showers

    • 62
    • 81

    Rain Showers Likely

Today 15 Sep Westmoreland

Mostly sunny. Highs in the lower 80s. Southeast Winds 5 to 10 Mph.

Tonight 15 Sep Westmoreland

Mainly clear. Lows around 60. South Winds 5 to 10 Mph.

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Irwin Temperature Statistics

September Temperature

Pittsburgh - Allegheny County Airport (11.2 miles)

  • Lowest 6 September, 2026

    57.9 °F

  • Average September

    73 °F

  • Highest 2 September, 2026

    91 °F

Climate (2021–2026)

Pittsburgh - Allegheny County Airport (11.2 miles)

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  • Average Low 2021–2026

    46.1 °F

  • Average 2021–2026

    54.7 °F

  • Average High 2021–2026

    63.3 °F
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