Herrin Weather Forecast

    • 53
    • 83

    Increasing Clouds

    • 49
    • 77

    Mostly Sunny

    • 47
    • 79

    Mostly Sunny

    • 50
    • 80

    Mostly Sunny

    • 55
    • 85

    Mostly Sunny

    • 60
    • 89

    Mostly Sunny

Today 5 Sep Williamson

Sunny in the Morning, then partly sunny with a slight chance of Showers in the afternoon. Highs in the lower 80s. West Winds 5 to 10 Mph, becoming north in the afternoon. Chance of rain 20 percent.

Tonight 5 Sep Williamson

Mostly clear. Near steady temperature around 60. South Winds around 5 Mph.

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Herrin Temperature Statistics

September Temperature

Marion - Williamson County Regional Airport (2.5 miles)

  • Lowest 1 September, 2025

    52.7 °F

  • Average September

    66.1 °F

  • Highest 1 September, 2025

    82.4 °F

Climate (2020–Present)

Marion - Williamson County Regional Airport (2.5 miles)

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  • Average Low 2020–2025

    47.2 °F

  • Average 2020–2025

    55.5 °F

  • Average High 2020–2025

    67.4 °F
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