Starved Rock State Park Weather Forecast

    • 64
    • 82

    Rain Showers

    • 68
    • 77

    Rain Showers Likely

    • 65
    • 81

    Rain Showers Likely

    • 67
    • 81

    Chance Rain Showers

    • 64
    • 84

    Chance Rain Showers

    • 58
    • 75

    Chance Rain Showers

Today 15 Sep La Salle

Mostly cloudy in the Morning, then becoming partly cloudy. A chance of Showers and Thunderstorms. Highs in the lower 80s. Southwest Winds 5 to 10 Mph, becoming west in the afternoon. Chance of precipitation 50 percent.

Tonight 15 Sep La Salle

A chance of Thunderstorms in the evening. Showers likely. A slight chance of Thunderstorms after midnight. Lows in the mid 60s. North Winds 5 to 10 Mph. Chance of precipitation 70 percent.

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Starved Rock State Park Temperature Statistics

September Temperature

Illinois Valley Regional Airport (7.5 miles)

  • Lowest 13 September, 2026

    51.8 °F

  • Average September

    75.6 °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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