Starved Rock State Park Weather Forecast

    • 72
    • 87

    Thunderstorms Likely

    • 71
    • 87

    Rain Showers Likely

    • 70
    • 86

    Rain Showers Likely

    • 68
    • 85

    Chance Thunderstorms

    • 64
    • 80

    Chance Thunderstorms

    • 64
    • 76

    Chance Thunderstorms

    • 66
    • 78

    Chance Rain Showers

Today 9 Aug La Salle

Mostly cloudy. A slight chance of Showers and Thunderstorms. Temperatures in the mid 80s. South Winds 5 to 10 Mph. Chance of precipitation 20 percent.

Tonight 9 Aug La Salle

Mostly cloudy. Showers and Thunderstorms Likely, mainly in the evening. Locally heavy rainfall possible late in the evening. Lows in the lower 70s. South Winds 5 to 10 Mph. Chance of precipitation 70 percent.

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Starved Rock State Park Temperature Statistics

August Temperature

Illinois Valley Regional Airport (7.5 miles)

  • Lowest 3 August, 2026

    60.8 °F

  • Average August

    72.7 °F

  • Highest 7 August, 2026

    86 °F

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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