Starved Rock State Park Weather Forecast

    • 59
    • 87

    Partly Sunny

    • 53
    • 74

    Slight Chance Thunderstorms

    • 67
    • 76

    Chance Rain Showers

    • 65
    • 87

    Rain Showers Likely

    • 65
    • 81

    Rain Showers Likely

    • 60
    • 79

    Chance Rain Showers

Today 12 Sep La Salle

Partly cloudy. Highs in the mid 80s. Southwest Winds 5 to 10 Mph, becoming west in the afternoon.

Tonight 12 Sep La Salle

Partly cloudy. Lows around 60. North Winds around 5 Mph.

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Starved Rock State Park Temperature Statistics

September Temperature

Illinois Valley Regional Airport (7.5 miles)

  • Lowest 7 September, 2026

    59 °F

  • Average September

    77.5 °F

  • Highest 1 September, 2026

    93.2 °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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