Starved Rock State Park Weather Forecast

    • 64
    • 80

    Rain Showers

    • 53
    • 79

    Mostly Sunny

    • 62
    • 83

    Mostly Sunny

    • 64
    • 85

    Chance Rain Showers

    • 68
    • 84

    Chance Rain Showers

    • 67
    • 90

    Rain Showers Likely

Today 9 Sep La Salle

A slight chance of Thunderstorms early in the morning. Showers in the morning. Humid. Highs around 80. West Winds 5 to 10 Mph. Chance of precipitation near 100 percent.

Tonight 9 Sep La Salle

Partly cloudy in the Evening, then becoming mostly cloudy. Lows in the mid 60s. Northwest Winds around 5 Mph.

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  • Temperature Real-Time

Starved Rock State Park Temperature Statistics

September Temperature

Illinois Valley Regional Airport (7.5 miles)

  • Lowest 6 September, 2026

    64.4 °F

  • Average September

    80.9 °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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