Marietta Weather Forecast

    • 66
    • 84

    Rain Showers

    • 62
    • 84

    Chance Rain Showers

    • 58
    • 76

    Mostly Sunny

    • 65
    • 84

    Mostly Sunny

    • 69
    • 88

    Partly Sunny

    • 64
    • 85

    Rain Showers Likely

Today 12 Sep Washington

Partly sunny this Morning, then mostly cloudy with a chance of Showers and Thunderstorms this afternoon. Some Thunderstorms may produce heavy rainfall this afternoon. Highs in the lower 80s. Southeast Winds around 5 Mph, becoming southwest around 5 Mph this afternoon. Chance of rain 50 percent.

Tonight 12 Sep Washington

Mostly cloudy. Showers likely with a chance of Thunderstorms in the Evening, then a slight chance of Showers after midnight. Areas of dense fog after midnight. Some Thunderstorms may produce heavy rainfall in the evening. Humid with Lows in the mid 60s. Southeast Winds around 5 Mph in the Evening, becoming light and variable. Chance of rain 70 percent.

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Marietta Temperature Statistics

September Temperature

Parkersburg, Mid-Ohio Valley Regional Airport (4.3 miles)

  • Lowest 6 September, 2026

    60.7 °F

  • Average September

    77.9 °F

  • Highest 3 September, 2026

    94.6 °F

Climate (2021–2026)

Parkersburg, Mid-Ohio Valley Regional Airport (4.3 miles)

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  • Average Low 2021–2026

    45.3 °F

  • Average 2021–2026

    55.8 °F

  • Average High 2021–2026

    66.5 °F
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