Starved Rock State Park Weather Forecast

    • 48
    • 75

    Partly Sunny

    • 52
    • 75

    Mostly Sunny

    • 63
    • 78

    Rain Showers Likely

    • 67
    • 74

    Rain Showers Likely

    • 56
    • 75

    Rain Showers Likely

    • 50
    • 67

    Chance Rain Showers

    • 53
    • 67

    Chance Rain Showers

Today 27 Sep La Salle

Partly cloudy. Highs in the mid 70s. Northeast Winds around 5 Mph.

Tonight 27 Sep La Salle

Partly cloudy. Patchy fog late. Lows in the upper 40s. 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 14 September, 2026

    50 °F

  • Average September

    71.5 °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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