Transportation Research Center of Ohio Airport Weather Forecast

    • 65
    • 80

    Rain Showers Likely

    • 55
    • 79

    Rain Showers Likely

    • 51
    • 67

    Chance Rain Showers

    • 54
    • 67

    Chance Rain Showers

    • 53
    • 67

    Chance Rain Showers

    • 52
    • 68

    Mostly Cloudy

Today 19 Sep Union

Partly cloudy this Morning, then mostly cloudy with a chance of Showers and Thunderstorms this afternoon. Highs around 80. East Winds around 5 Mph, becoming southeast this afternoon. Chance of rain 50 percent.

Tonight 19 Sep Union

Mostly cloudy. A chance of Showers and Thunderstorms in the Evening, then Showers likely with a slight chance of Thunderstorms after midnight. Muggy. Lows in the mid 60s. South Winds 5 to 10 Mph. 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 14 September, 2026

    51.8 °F

  • Average September

    73.9 °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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