Starved Rock State Park Weather Forecast

    • 60
    • 82

    Partly Sunny

    • 62
    • 81

    Mostly Sunny

    • 72
    • 87

    Partly Sunny

    • 65
    • 90

    Partly Sunny

    • 59
    • 81

    Partly Sunny

    • 62
    • 82

    Mostly Sunny

Today 6 Sep La Salle

Mostly sunny in the Morning, then becoming partly cloudy. Highs in the lower 80s. East Winds 5 to 10 Mph.

Tonight 6 Sep La Salle

Mostly cloudy. Near steady temperature in the upper 60s. Northeast Winds around 5 Mph.

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Starved Rock State Park Temperature Statistics

September Temperature

Illinois Valley Regional Airport (7.5 miles)

  • Lowest 1 September, 2026

    71.6 °F

  • Average September

    82.7 °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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