Starved Rock State Park Weather Forecast

    • 73
    • 89

    Partly Sunny

    • 74
    • 91

    Partly Sunny

    • 73
    • 92

    Slight Chance Thunderstorms

    • 71
    • 88

    Slight Chance Thunderstorms

    • 68
    • 87

    Partly Sunny

    • 65
    • 86

    Partly Sunny

Today 31 Aug La Salle

Partly cloudy. A slight chance of Showers and Thunderstorms early in the morning. A slight chance of Showers and Thunderstorms late. Humid with Highs in the upper 80s. Southwest Winds around 10 Mph. Chance of precipitation 20 percent.

Tonight 31 Aug La Salle

Mostly cloudy. A slight chance of Showers and Thunderstorms late. Near steady temperature in the lower 70s. South Winds 5 to 10 Mph. Chance of precipitation 20 percent.

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Starved Rock State Park Temperature Statistics

August Temperature

Illinois Valley Regional Airport (7.5 miles)

  • Lowest 23 August, 2026

    55.4 °F

  • Average August

    72.7 °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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