Starved Rock State Park Weather Forecast

    • 65
    • 79

    Partly Sunny

    • 63
    • 84

    Slight Chance Thunderstorms

    • 61
    • 82

    Mostly Sunny

    • 62
    • 82

    Partly Sunny

    • 67
    • 82

    Chance Rain Showers

    • 70
    • 86

    Chance Rain Showers

Today 25 Aug La Salle

Partly cloudy. Highs in the upper 70s. South Winds around 5 Mph.

Tonight 25 Aug La Salle

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

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Starved Rock State Park Temperature Statistics

August Temperature

Illinois Valley Regional Airport (7.5 miles)

  • Lowest 21 August, 2026

    59 °F

  • Average August

    73.8 °F

  • Highest 10 August, 2026

    89.6 °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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