Irwin Weather Forecast

    • 57
    • 80

    Becoming Sunny

    • 65
    • 85

    Mostly Sunny

    • 68
    • 87

    Chance Thunderstorms

    • 68
    • 86

    Rain Showers Likely

    • 67
    • 85

    Rain Showers Likely

    • 67
    • 84

    Rain Showers Likely

Today 3 Aug Westmoreland

Considerable cloudiness this Morning, then becoming partly sunny. Highs in the upper 70s. Northwest Winds 5 to 10 Mph.

Tonight 3 Aug Westmoreland

Mainly clear. Patchy fog after midnight. Lows in the mid 50s. North Winds 5 to 10 Mph, becoming northeast after midnight.

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Irwin Temperature Statistics

August Temperature

Pittsburgh - Allegheny County Airport (11.2 miles)

  • Lowest 1 August, 2026

    66 °F

  • Average August

    74 °F

  • Highest 1 August, 2026

    82 °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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