Herrin Weather Forecast

    • 74
    • 91

    Chance Thunderstorms

    • 74
    • 93

    Chance Thunderstorms

    • 71
    • 92

    Slight Chance Thunderstorms

    • 76
    • 94

    Mostly Sunny

    • 70
    • 95

    Partly Sunny

    • 65
    • 86

    Partly Sunny

Today 17 Jul Williamson

Mostly sunny. A slight chance of Showers and Thunderstorms in the Morning, then a chance of Showers and Thunderstorms in the afternoon. Highs around 90. West Winds around 5 Mph. Chance of rain 50 percent.

Tonight 17 Jul Williamson

Mostly clear. Lows in the mid 70s. Southwest Winds around 5 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Herrin Temperature Statistics

July Temperature

Marion - Williamson County Regional Airport (2.5 miles)

  • Lowest 13 July, 2026

    67.5 °F

  • Average July

    76 °F

  • Highest 2 July, 2026

    95 °F

Climate (2021–2026)

Marion - Williamson County Regional Airport (2.5 miles)

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  • Average Low 2021–2026

    47.8 °F

  • Average 2021–2026

    56.2 °F

  • Average High 2021–2026

    68.1 °F
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