Monongahela Weather Forecast

    • 58
    • 78

    Rain Showers

    • 56
    • 68

    Rain Showers

    • 52
    • 68

    Rain Showers

    • 51
    • 64

    Rain Showers Likely

    • 49
    • 66

    Mostly Cloudy

    • 48
    • 68

    Partly Sunny

Today 20 Sep Washington

Considerable cloudiness. Patchy fog early. Scattered Showers with isolated Thunderstorms Early, then numerous Showers and scattered Thunderstorms. Highs in the mid 70s. West Winds 5 to 10 Mph. Chance of rain 70 percent.

Tonight 20 Sep Washington

Mostly cloudy with isolated Thunderstorms. Scattered Showers in the Evening, then numerous Showers after midnight. Patchy fog. Humid with Lows in the upper 50s. Northeast Winds 5 to 10 Mph. Chance of rain 70 percent.

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Monongahela Temperature Statistics

September Temperature

Pittsburgh - Allegheny County Airport (9.9 miles)

  • Lowest 15 September, 2026

    53.1 °F

  • Average September

    72 °F

  • Highest 2 September, 2026

    91 °F

Climate (2021–2026)

Pittsburgh - Allegheny County Airport (9.9 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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