Irwin Weather Forecast

    • 71
    • 87

    Mostly Sunny

    • 68
    • 86

    Chance Thunderstorms

    • 66
    • 84

    Rain Showers

    • 64
    • 83

    Rain Showers Likely

    • 60
    • 80

    Chance Thunderstorms

    • 58
    • 77

    Chance Rain Showers

Today 9 Aug Union

Mostly sunny. Highs in the upper 80s. Light and variable Winds, becoming southwest around 5 Mph this late morning and early Afternoon, then increasing to around 10 Mph late.

Tonight 9 Aug Union

Partly cloudy. A slight chance of Showers and Thunderstorms in the Evening, then a chance of Showers with a slight chance of Thunderstorms after midnight. Muggy. Lows in the lower 70s. Southwest Winds 5 to 10 Mph. Chance of rain 40 percent.

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Irwin Temperature Statistics

August Temperature

Marysville Union County Airport (9.9 miles)

  • Lowest 4 August, 2026

    50 °F

  • Average August

    71.6 °F

  • Highest 6 August, 2026

    87.8 °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

    52.7 °F

  • Average High 2021–2026

    62.6 °F
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