Irwin Weather Forecast

    • 50
    • 71

    Mostly Sunny

    • 59
    • 82

    Mostly Sunny

    • 66
    • 85

    Partly Sunny

    • 68
    • 85

    Rain Showers Likely

    • 64
    • 82

    Chance Rain Showers

    • 66
    • 83

    Rain Showers Likely

    • 62
    • 81

    Chance Rain Showers

Today 14 Sep Westmoreland

Mostly sunny. Near steady temperature in the upper 60s. North Winds 5 to 10 Mph.

Tonight 14 Sep Westmoreland

Mainly clear. Patchy fog after midnight. Lows around 50. East Winds around 5 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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