Rock Run County Forest Preserve Weather Forecast

    • 66
    • 79

    Rain Showers

    • 58
    • 72

    Rain Showers Likely

    • 53
    • 66

    Chance Rain Showers

    • 53
    • 64

    Mostly Cloudy

    • 54
    • 67

    Mostly Cloudy

    • 54
    • 69

    Mostly Cloudy

Today 19 Sep Northern Will

Thunderstorms likely in the morning. Showers. A chance of Thunderstorms in the afternoon. Some Thunderstorms may produce heavy rainfall in the morning. Humid. Highs in the upper 70s. East Winds around 10 Mph, becoming south in the afternoon. Chance of precipitation near 100 percent.

Tonight 19 Sep Northern Will

Thunderstorms likely until early morning. Showers. A chance of Thunderstorms late. Humid with Lows in the mid 60s. Southeast Winds around 5 Mph, becoming north after midnight. Chance of precipitation near 100 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Rock Run County Forest Preserve Temperature Statistics

September Temperature

Joliet Regional Airport (1.2 miles)

  • Lowest 14 September, 2026

    50 °F

  • Average September

    75.4 °F

  • Highest 2 September, 2026

    95.9 °F

Climate (2021–2026)

Joliet Regional Airport (1.2 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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