Starved Rock State Park Weather Forecast

    • 66
    • 70

    Rain Showers

    • 55
    • 75

    Rain Showers

    • 44
    • 68

    Mostly Sunny

    • 46
    • 69

    Mostly Sunny

    • 44
    • 72

    Mostly Sunny

    • 41
    • 66

    Mostly Sunny

    • 49
    • 68

    Partly Sunny

Today 30 Sep La Salle

Partly cloudy. Highs in the lower 70s.

Tonight 30 Sep La Salle

Showers until early Morning, then a chance of Showers late. Near steady temperature in the mid 60s. Southeast Winds around 5 Mph. Chance of precipitation near 100 percent.

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Starved Rock State Park Temperature Statistics

September Temperature

Illinois Valley Regional Airport (7.5 miles)

  • Lowest 26 September, 2026

    48.2 °F

  • Average September

    70.4 °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

    62.5 °F
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