Starved Rock State Park Weather Forecast

    • 48
    • 70

    Becoming Sunny

    • 49
    • 72

    Mostly Sunny

    • 56
    • 76

    Mostly Cloudy

    • 53
    • 76

    Partly Sunny

    • 51
    • 74

    Partly Sunny

    • 54
    • 76

    Partly Sunny

Today 25 Aug La Salle

Sunny late in the Morning, then becoming partly cloudy. Highs around 70. Northwest Winds 10 to 15 Mph.

Tonight 25 Aug La Salle

Mostly clear. Lows in the upper 40s. 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, 2025

    53.6 °F

  • Average August

    74 °F

  • Highest 16 August, 2025

    91.4 °F

Climate (2020–Present)

Illinois Valley Regional Airport (7.5 miles)

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  • Average Low 2020–2025

    43.2 °F

  • Average 2020–2025

    52.6 °F

  • Average High 2020–2025

    62.1 °F
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