Irwin Weather Forecast

    • 59
    • 84

    Increasing Clouds

    • 58
    • 85

    Partly Sunny

    • 58
    • 88

    Mostly Sunny

    • 57
    • 88

    Mostly Sunny

    • 59
    • 87

    Partly Sunny

    • 59
    • 88

    Partly Sunny

Today 13 Sep Union

Mostly sunny in the Morning, then becoming partly cloudy. Highs in the mid 80s. Light and variable Winds, becoming west around 5 Mph in the afternoon.

Tonight 13 Sep Union

Partly cloudy with a 20 percent chance of Showers. Lows in the upper 50s. Southeast Winds around 5 Mph in the Evening, becoming light and variable.

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Irwin Temperature Statistics

September Temperature

Marysville Union County Airport (9.9 miles)

  • Lowest 9 September, 2025

    37.4 °F

  • Average September

    59 °F

  • Highest 3 September, 2025

    80.6 °F

Climate (2020–Present)

Marysville Union County Airport (9.9 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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