Starved Rock State Park Weather Forecast

    • 58
    • 80

    Mostly Sunny

    • 57
    • 77

    Mostly Sunny

    • 60
    • 77

    Partly Sunny

    • 65
    • 79

    Slight Chance Thunderstorms

    • 64
    • 82

    Slight Chance Thunderstorms

    • 64
    • 82

    Partly Sunny

Today 22 Aug La Salle

Mostly sunny. A slight chance of Thunderstorms with isolated Showers late. Highs around 80. Northwest Winds 5 to 10 Mph, increasing to 10 to 15 Mph in the afternoon. Chance of precipitation 20 percent.

Tonight 22 Aug La Salle

Clear. Lows in the upper 50s. Northwest Winds 5 to 10 Mph.

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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

    74.3 °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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