Starved Rock State Park Weather Forecast

    • 64
    • 76

    Rain Showers Likely

    • 65
    • 80

    Rain Showers

    • 56
    • 72

    Rain Showers Likely

    • 53
    • 65

    Chance Rain Showers

    • 51
    • 64

    Slight Chance Rain Showers

    • 51
    • 67

    Partly Sunny

Today 18 Sep La Salle

Mostly cloudy. Isolated Showers late in the Morning, then scattered Showers late in the morning. Isolated Showers in the afternoon. Highs in the mid 70s. East Winds 5 to 10 Mph. Chance of precipitation 30 percent.

Tonight 18 Sep La Salle

Partly cloudy in the Evening, then becoming cloudy. A chance of Showers and Thunderstorms after midnight. Showers and Thunderstorms likely late. Lows in the mid 60s. East Winds around 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 14 September, 2026

    50 °F

  • Average September

    74.5 °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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