Starved Rock State Park Weather Forecast

    • 69
    • 79

    Severe Tstms

    • 68
    • 80

    Rain Showers Likely

    • 70
    • 83

    Rain Showers Likely

    • 72
    • 86

    Chance Rain Showers

    • 68
    • 86

    Slight Chance Thunderstorms

    • 63
    • 80

    Partly Sunny

    • 66
    • 81

    Slight Chance Thunderstorms

Today 12 Aug La Salle

Mostly cloudy. A chance of Showers and Thunderstorms. Temperatures in the upper 70s. West Winds 5 to 10 Mph. Chance of precipitation 30 percent.

Tonight 12 Aug La Salle

Partly cloudy in the Evening, then becoming mostly cloudy. A chance of Showers and a slight chance of Thunderstorms early in the evening. A slight chance of Showers and Thunderstorms after midnight. Patchy fog after midnight. Humid. Lows in the upper 60s. Southeast Winds around 5 Mph, becoming east after midnight. Chance of precipitation 30 percent.

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Starved Rock State Park Temperature Statistics

August Temperature

Illinois Valley Regional Airport (7.5 miles)

  • Lowest 3 August, 2026

    60.8 °F

  • Average August

    74 °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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