Starved Rock State Park Weather Forecast

    • 74
    • 96

    Slight Chance Thunderstorms

    • 73
    • 93

    Chance Thunderstorms

    • 70
    • 89

    Slight Chance Thunderstorms

    • 66
    • 85

    Partly Sunny

    • 67
    • 85

    Partly Sunny

    • 71
    • 85

    Slight Chance Rain Showers

Today 3 Sep La Salle

Mostly sunny. A slight chance of Showers and Thunderstorms in the afternoon. Hot, humid. Highs in the mid 90s. Southwest Winds 5 to 10 Mph. Chance of precipitation 20 percent. Heat index Values up to 104.

Tonight 3 Sep La Salle

Mostly clear. A slight chance of Showers and Thunderstorms late. Humid with Lows in the mid 70s. South Winds 5 to 10 Mph. Chance of precipitation 20 percent.

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Starved Rock State Park Temperature Statistics

September Temperature

Illinois Valley Regional Airport (7.5 miles)

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Climate (2021–2026)

Illinois Valley Regional Airport (7.5 miles)

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  • Average Low 2021–2026

    43.3 °F

  • Average 2021–2026

    52.9 °F

  • Average High 2021–2026

    62.6 °F
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