Irwin Weather Forecast

    • 49
    • 75

    Rain Showers

    • 52
    • 69

    Chance Rain Showers

    • 53
    • 65

    Rain Showers

    • 58
    • 70

    Rain Showers

    • 59
    • 78

    Rain Showers Likely

    • 61
    • 80

    Chance Rain Showers

Today 20 May Westmoreland

A chance of Thunderstorms. Showers with Highs in the upper 70s. Temperatures falling into the upper 60s in the afternoon. West Winds 5 to 10 Mph, becoming northwest in the afternoon. Chance of rain 90 percent.

Tonight 20 May Westmoreland

Considerable cloudiness with a 50 percent chance of Showers. Much cooler. Less humid with Lows in the upper 40s. North Winds 5 to 10 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Irwin Temperature Statistics

May Temperature

Pittsburgh - Allegheny County Airport (11.2 miles)

  • Lowest 2 May, 2026

    34 °F

  • Average May

    54.6 °F

  • Highest 17 May, 2026

    82 °F

Climate (2021–Present)

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

    63.4 °F
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