Marysville Weather Forecast

    • 69
    • 88

    Slight Chance Thunderstorms

    • 61
    • 89

    Rain Showers

    • 45
    • 69

    Rain Showers Likely

    • 50
    • 67

    Mostly Cloudy

    • 60
    • 72

    Rain Showers

    • 61
    • 77

    Rain Showers Likely

Today 18 May Union

Mostly sunny early this Afternoon, then becoming partly cloudy. Highs in the upper 80s. Southwest Winds 15 to 20 Mph with Gusts up to 30 Mph.

Tonight 18 May Union

Mostly cloudy with a chance of Showers with a slight chance of Thunderstorms this Evening, then partly cloudy after midnight. Unseasonably warm with Lows in the upper 60s. Southwest Winds 10 to 15 Mph. Gusts up to 30 Mph, decreasing to 25 Mph after midnight. Chance of rain 30 percent.

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Marysville Temperature Statistics

May Temperature

Marysville Union County Airport (0.6 miles)

  • Lowest 2 May, 2026

    33.8 °F

  • Average May

    54.6 °F

  • Highest 4 May, 2026

    75.2 °F

Climate (2021–Present)

Marysville Union County Airport (0.6 miles)

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  • Average Low 2021–2026

    43.1 °F

  • Average 2021–2026

    52.7 °F

  • Average High 2021–2026

    62.5 °F
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