Marysville Weather Forecast

    • 56
    • 87

    Mostly Sunny

    • 54
    • 85

    Mostly Sunny

    • 55
    • 84

    Mostly Sunny

    • 56
    • 87

    Mostly Sunny

    • 56
    • 87

    Slight Chance Thunderstorms

    • 59
    • 83

    Chance Rain Showers

Today 15 Sep Union

Mostly sunny. Highs in the upper 80s. Northeast Winds 5 to 10 Mph.

Tonight 15 Sep Union

Mostly clear in the Evening, then becoming partly cloudy. Lows in the mid 50s. Northeast Winds 5 to 10 Mph.

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Marysville Temperature Statistics

September Temperature

Marysville Union County Airport (0.6 miles)

  • Lowest 9 September, 2025

    37.4 °F

  • Average September

    59.5 °F

  • Highest 3 September, 2025

    80.6 °F

Climate (2020–Present)

Marysville Union County Airport (0.6 miles)

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  • Average Low 2020–2025

    42.8 °F

  • Average 2020–2025

    52.3 °F

  • Average High 2020–2025

    62 °F
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