Monongahela Weather Forecast

    • 59
    • 80

    Rain Showers Likely

    • 57
    • 79

    Mostly Sunny

    • 58
    • 81

    Mostly Sunny

    • 64
    • 83

    Partly Sunny

    • 67
    • 88

    Rain Showers Likely

    • 59
    • 79

    Chance Rain Showers

Today 5 Sep Washington

Considerable cloudiness. Patchy fog this morning. A chance of Showers with a slight chance of Thunderstorms this Morning, then Showers likely with a chance of Thunderstorms this afternoon. Highs in the upper 70s. Northwest Winds around 5 Mph. Chance of rain 70 percent.

Tonight 5 Sep Washington

Mainly clear. A chance of Showers and Thunderstorms in the evening. Lows in the upper 50s. North Winds around 5 Mph. Chance of rain 50 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Monongahela Temperature Statistics

September Temperature

Pittsburgh - Allegheny County Airport (9.9 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 (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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