Irwin Weather Forecast

    • 66
    • 88

    Chance Thunderstorms

    • 48
    • 75

    Rain Showers

    • 52
    • 68

    Chance Rain Showers

    • 54
    • 69

    Rain Showers

    • 59
    • 73

    Rain Showers

    • 61
    • 80

    Rain Showers Likely

Today 19 May Westmoreland

Partly cloudy. A slight chance of Showers and Thunderstorms this afternoon. Unseasonably warm with Highs in the upper 80s. Southwest Winds 10 to 15 Mph with Gusts up to 25 Mph. Chance of rain 20 percent.

Tonight 19 May Westmoreland

Partly cloudy in the Evening, then mostly cloudy with a chance of Showers with a slight chance of Thunderstorms after midnight. Warm with Lows in the mid 60s. Southwest Winds 5 to 10 Mph. Chance of rain 50 percent.

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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

    53.5 °F

  • Highest 5 May, 2026

    73.9 °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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