Irwin Weather Forecast

    • 58
    • 87

    Mostly Sunny

    • 58
    • 89

    Mostly Sunny

    • 59
    • 86

    Partly Sunny

    • 62
    • 87

    Chance Rain Showers

    • 61
    • 82

    Chance Rain Showers

    • 57
    • 82

    Chance Rain Showers

Today 18 Sep Union

Sunny. Highs in the upper 80s. Light and variable Winds, becoming north around 5 Mph this afternoon.

Tonight 18 Sep Union

Clear. Lows in the upper 50s. Northeast 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

    61.2 °F

  • Highest 15 September, 2025

    86 °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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