Starved Rock State Park Weather Forecast

    • 74
    • 82

    Rain Showers

    • 65
    • 85

    Chance Thunderstorms

    • 63
    • 80

    Mostly Sunny

    • 67
    • 82

    Chance Thunderstorms

    • 60
    • 78

    Slight Chance Thunderstorms

    • 60
    • 76

    Slight Chance Thunderstorms

    • 62
    • 76

    Partly Sunny

Today 15 Aug La Salle

Mostly cloudy. A slight chance of Showers and Thunderstorms. Temperatures in the lower 80s. Southwest Winds around 5 Mph. Chance of precipitation 20 percent.

Tonight 15 Aug La Salle

Mostly cloudy. A chance of Showers in the evening. A chance of Thunderstorms. Showers likely after midnight. Lows in the mid 70s. South Winds around 5 Mph, becoming southwest after midnight. 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

    74.1 °F

  • Highest 10 August, 2026

    89.6 °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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