Transportation Research Center of Ohio Airport Weather Forecast

    • 61
    • 78

    Chance Rain Showers

    • 63
    • 79

    Partly Sunny

    • 66
    • 81

    Chance Thunderstorms

    • 63
    • 82

    Slight Chance Thunderstorms

    • 68
    • 83

    Mostly Sunny

    • 65
    • 86

    Chance Rain Showers

Today 10 Sep Union

Partly cloudy early this Morning, then becoming mostly cloudy. A chance of Showers with a slight chance of Thunderstorms this afternoon. Highs in the upper 70s. Light and variable Winds, becoming west around 5 Mph this late morning and afternoon. Chance of rain 50 percent.

Tonight 10 Sep Union

Mostly cloudy with a chance of Showers with a slight chance of Thunderstorms in the Evening, then partly cloudy after midnight. Lows in the lower 60s. North Winds around 5 Mph. Chance of rain 40 percent.

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Transportation Research Center of Ohio Airport Temperature Statistics

September Temperature

Marysville Union County Airport (11.2 miles)

  • Lowest 7 September, 2026

    59 °F

  • Average September

    76 °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

    62.6 °F
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