Arnold Weather Forecast

    • 56
    • 66

    Chance Rain Showers

    • 54
    • 64

    Chance Rain Showers

    • 47
    • 68

    Mostly Cloudy

    • 46
    • 67

    Partly Sunny

    • 47
    • 68

    Partly Sunny

Today 22 Sep Union

Cloudy. Highs in the mid 60s. Northeast Winds 10 to 15 Mph with Gusts up to 25 Mph.

Tonight 22 Sep Union

Cloudy with a 40 percent chance of Showers. Lows in the mid 50s. Northeast Winds 10 to 15 Mph.

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Arnold Temperature Statistics

September Temperature

Marysville Union County Airport (7.5 miles)

  • Lowest 14 September, 2026

    51.8 °F

  • Average September

    73.5 °F

  • Highest 1 September, 2026

    93.2 °F

Climate (2021–2026)

Marysville Union County Airport (7.5 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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