Portland Weather Forecast

    • 68
    • 86

    Chance Thunderstorms

    • 66
    • 87

    Chance Rain Showers

    • 61
    • 81

    Chance Thunderstorms

    • 60
    • 75

    Chance Rain Showers

    • 58
    • 72

    Chance Rain Showers

    • 57
    • 72

    Mostly Cloudy

Today 19 Sep Pendleton

Partly cloudy. Widespread fog in the morning. A chance of Showers with a slight chance of Thunderstorms in the afternoon. Humid with Highs in the upper 80s. East Winds around 5 Mph, becoming south around 5 Mph in the afternoon. Chance of rain 40 percent.

Tonight 19 Sep Pendleton

Partly cloudy. A chance of Showers and Thunderstorms in the Evening, then a chance of Showers with a slight chance of Thunderstorms after midnight. Muggy and Unseasonably warm. Lows in the upper 60s. South Winds around 5 Mph. Chance of rain 40 percent.

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Portland Temperature Statistics

September Temperature

Cincinnati/Northern Kentucky International Airport (23.6 miles)

  • Lowest 14 September, 2026

    58.6 °F

  • Average September

    79.2 °F

  • Highest 4 September, 2026

    97.6 °F

Climate (2021–2026)

Cincinnati/Northern Kentucky International Airport (23.6 miles)

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  • Average Low 2021–2026

    47.5 °F

  • Average 2021–2026

    56.7 °F

  • Average High 2021–2026

    66.1 °F
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