Transportation Research Center of Ohio Airport Weather Forecast

    • 69
    • 89

    Rain Showers Likely

    • 60
    • 84

    Chance Thunderstorms

    • 57
    • 79

    Mostly Sunny

    • 60
    • 81

    Partly Sunny

    • 66
    • 83

    Partly Sunny

    • 70
    • 87

    Mostly Cloudy

Today 4 Sep Union

Partly cloudy with a chance of Showers with a slight chance of Thunderstorms in the Morning, then mostly sunny with a slight chance of Showers and Thunderstorms in the afternoon. Humid with Highs in the upper 80s. West Winds 5 to 10 Mph. Chance of rain 30 percent.

Tonight 4 Sep Union

Mostly clear. Unseasonably warm with Lows around 70. Southwest Winds around 5 Mph.

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Transportation Research Center of Ohio Airport Temperature Statistics

September Temperature

Marysville Union County Airport (11.2 miles)

  • Lowest 1 September, 2026

    73.4 °F

  • Average September

    80.7 °F

  • Highest 1 September, 2026

    93.2 °F

Climate (2021–2026)

Marysville Union County Airport (11.2 miles)

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  • Average Low 2021–2026

    43.1 °F

  • Average 2021–2026

    52.7 °F

  • Average High 2021–2026

    62.5 °F
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