Transportation Research Center of Ohio Airport Weather Forecast

    • 69
    • 87

    Rain Showers Likely

    • 65
    • 84

    Rain Showers Likely

    • 59
    • 77

    Partly Sunny

    • 67
    • 83

    Rain Showers Likely

    • 63
    • 81

    Chance Rain Showers

    • 60
    • 77

    Chance Rain Showers

Today 16 Sep Union

Partly cloudy until late Afternoon, then becoming mostly cloudy. 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 80s. North Winds around 5 Mph, becoming southeast late this Morning, then becoming southwest around 5 Mph this afternoon. Chance of rain 70 percent.

Tonight 16 Sep Union

Partly cloudy. Showers likely with a chance of Thunderstorms in the Evening, then a chance of Showers and Thunderstorms after midnight. Muggy and Unseasonably warm. Lows in the upper 60s. Northeast Winds around 5 Mph, becoming east after midnight. Chance of rain 60 percent.

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Transportation Research Center of Ohio Airport Temperature Statistics

September Temperature

Marysville Union County Airport (11.2 miles)

  • Lowest 8 September, 2026

    57.2 °F

  • Average September

    74.8 °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

    52.8 °F

  • Average High 2021–2026

    62.6 °F
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