Irwin Weather Forecast

    • 56
    • 78

    Mostly Sunny

    • 58
    • 81

    Mostly Sunny

    • 67
    • 86

    Partly Sunny

    • 68
    • 89

    Chance Thunderstorms

    • 57
    • 80

    Chance Rain Showers

    • 56
    • 79

    Mostly Sunny

Today 6 Sep Union

Mostly sunny. Highs in the upper 70s. Northeast Winds 5 to 10 Mph.

Tonight 6 Sep Union

Mostly clear. Lows in the mid 50s. Northeast Winds 5 to 10 Mph.

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Irwin Temperature Statistics

September Temperature

Marysville Union County Airport (9.9 miles)

  • Lowest 2 September, 2026

    69.8 °F

  • Average September

    81.4 °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

    52.7 °F

  • Average High 2021–2026

    62.6 °F
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