Pittsburgh Weather Forecast

    • 68
    • 81

    Mostly Cloudy

    • 61
    • 82

    Chance Thunderstorms

    • 58
    • 80

    Mostly Sunny

    • 60
    • 81

    Partly Sunny

    • 65
    • 84

    Mostly Cloudy

    • 70
    • 88

    Chance Rain Showers

    • 60
    • 82

    Chance Thunderstorms

Today 4 Sep Allegheny

Showers likely with a chance of Thunderstorms. Some Thunderstorms may be severe with heavy rainfall. Near steady temperature in the upper 70s. West Winds 5 to 10 Mph. Chance of rain 70 percent.

Tonight 4 Sep Allegheny

Mostly cloudy. A slight chance of Thunderstorms this evening. Patchy fog after midnight. Some Thunderstorms may be severe. Warm with Lows in the upper 60s. West Winds around 5 Mph. Chance of precipitation 20 percent.

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Pittsburgh Temperature Statistics

September Temperature

Pittsburgh - Allegheny County Airport (6.8 miles)

  • Lowest 1 September, 2026

    71.1 °F

  • Average September

    79.4 °F

  • Highest 2 September, 2026

    91 °F

Climate (2021–2026)

Pittsburgh - Allegheny County Airport (6.8 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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