Irwin Weather Forecast

    • 52
    • 64

    Rain Showers

    • 50
    • 62

    Rain Showers Likely

    • 45
    • 65

    Partly Sunny

    • 45
    • 67

    Mostly Sunny

    • 47
    • 68

    Partly Sunny

    • 49
    • 70

    Partly Sunny

Today 22 Sep Westmoreland

Showers in the Morning, then a chance of Showers with a slight chance of Thunderstorms in the afternoon. Highs in the lower 60s. East Winds 10 to 15 Mph with Gusts up to 30 Mph. Chance of rain 80 percent.

Tonight 22 Sep Westmoreland

Showers. Lows in the lower 50s. East Winds 15 to 20 Mph with Gusts up to 30 Mph. Chance of rain 90 percent.

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Irwin Temperature Statistics

September Temperature

Pittsburgh - Allegheny County Airport (11.2 miles)

  • Lowest 15 September, 2026

    53.1 °F

  • Average September

    71.7 °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 °F

  • Average 2021–2026

    54.6 °F

  • Average High 2021–2026

    63.3 °F
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