Rock Run County Forest Preserve Weather Forecast
- 58
- 86
Mostly Sunny
- 62
- 88
Mostly Sunny
- 63
- 87
Slight Chance Thunderstorms
- 63
- 83
Slight Chance Thunderstorms
- 65
- 82
Chance Rain Showers
- 62
- 80
Chance Rain Showers
Today 17 Sep Northern Will
Mostly sunny. Highs in the mid 80s. Northeast Winds around 5 Mph.
Tonight 17 Sep Northern Will
Mostly clear. Lows in the upper 50s. East Winds around 5 Mph in the Evening, becoming light and variable.
Rock Run County Forest Preserve Temperature Statistics
September Temperature
Joliet Regional Airport (1.2 miles)
Lowest 7 September, 2025
40.1 °FAverage September
64.9 °FHighest 14 September, 2025
88.5 °F
Climate (2020–Present)
Joliet Regional Airport (1.2 miles)
Average Low 2020–2025
43.4 °FAverage 2020–2025
53.5 °FAverage High 2020–2025
63 °F