Starved Rock State Park Weather Forecast

    • 56
    • 87

    Sunny

    • 57
    • 86

    Mostly Sunny

    • 61
    • 89

    Partly Sunny

    • 61
    • 83

    Chance Rain Showers

    • 62
    • 81

    Chance Rain Showers

    • 63
    • 80

    Chance Rain Showers

Today 16 Sep La Salle

Sunny. Highs in the upper 80s. East Winds 5 to 10 Mph.

Tonight 16 Sep La Salle

Mostly clear. Lows in the mid 50s. Northeast Winds 5 to 10 Mph.

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Starved Rock State Park Temperature Statistics

September Temperature

Illinois Valley Regional Airport (7.5 miles)

  • Lowest 7 September, 2025

    39.6 °F

  • Average September

    64.1 °F

  • Highest 14 September, 2025

    91.6 °F

Climate (2020–Present)

Illinois Valley Regional Airport (7.5 miles)

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  • Average Low 2020–2025

    43.1 °F

  • Average 2020–2025

    52.6 °F

  • Average High 2020–2025

    62 °F
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