Coal City Weather Forecast

    • 67
    • 81

    Chance Thunderstorms

    • 60
    • 80

    Partly Sunny

    • 60
    • 80

    Mostly Sunny

    • 64
    • 80

    Chance Rain Showers

    • 61
    • 79

    Chance Thunderstorms

    • 60
    • 77

    Partly Sunny

Today 18 Aug Grundy

Mostly cloudy. A slight chance of Showers early in the afternoon. A chance of Showers and Thunderstorms late. Highs around 80. Southwest Winds 5 to 10 Mph. Chance of precipitation 40 percent.

Tonight 18 Aug Grundy

Mostly cloudy. A chance of Showers and Thunderstorms until early Morning, then a slight chance of Showers and Thunderstorms late. Humid with Lows in the mid 60s. West Winds 5 to 10 Mph. Chance of precipitation 50 percent.

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Coal City Temperature Statistics

August Temperature

Joliet Regional Airport (16.8 miles)

  • Lowest 3 August, 2026

    60.6 °F

  • Average August

    75.4 °F

  • Highest 10 August, 2026

    89.4 °F

Climate (2021–2026)

Joliet Regional Airport (16.8 miles)

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  • Average Low 2021–2026

    43.7 °F

  • Average 2021–2026

    53.8 °F

  • Average High 2021–2026

    63.4 °F
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