Irwin Weather Forecast

    • 58
    • 82

    Rain Showers Likely

    • 54
    • 68

    Chance Rain Showers

    • 54
    • 68

    Rain Showers Likely

    • 52
    • 66

    Rain Showers Likely

    • 50
    • 67

    Mostly Cloudy

    • 48
    • 67

    Partly Sunny

Today 20 Sep Union

Mostly cloudy with a chance of Showers and Thunderstorms. Highs in the lower 80s. East Winds around 5 Mph, becoming south late this Morning, then becoming west early this Afternoon, becoming north late. Chance of rain 50 percent.

Tonight 20 Sep Union

Showers likely with a chance of Thunderstorms in the Evening, then Showers likely with a slight chance of Thunderstorms after midnight. Lows in the upper 50s. Northeast Winds 10 to 15 Mph. Chance of rain 70 percent.

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Irwin Temperature Statistics

September Temperature

Marysville Union County Airport (9.9 miles)

  • Lowest 14 September, 2026

    51.8 °F

  • Average September

    74 °F

  • Highest 1 September, 2026

    93.2 °F

Climate (2021–2026)

Marysville Union County Airport (9.9 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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