Rock Run County Forest Preserve Weather Forecast

    • 68
    • 81

    Mostly Cloudy

    • 71
    • 88

    Mostly Cloudy

    • 75
    • 90

    Partly Sunny

    • 74
    • 91

    Partly Sunny

    • 72
    • 91

    Slight Chance Thunderstorms

    • 72
    • 90

    Chance Rain Showers

Today 29 Aug Northern Will

Mostly cloudy. Highs in the lower 80s. South Winds 5 to 10 Mph.

Tonight 29 Aug Northern Will

Mostly cloudy. Lows in the upper 60s. South Winds around 10 Mph.

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Rock Run County Forest Preserve Temperature Statistics

August Temperature

Joliet Regional Airport (1.2 miles)

  • Lowest 24 August, 2026

    52.5 °F

  • Average August

    74 °F

  • Highest 10 August, 2026

    89.4 °F

Climate (2021–2026)

Joliet Regional Airport (1.2 miles)

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  • Average Low 2021–2026

    43.6 °F

  • Average 2021–2026

    53.8 °F

  • Average High 2021–2026

    63.3 °F
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