Starved Rock State Park Weather Forecast

    • 68
    • 77

    Rain Showers

    • 66
    • 74

    Rain Showers

    • 61
    • 79

    Partly Sunny

    • 63
    • 81

    Mostly Sunny

    • 66
    • 84

    Mostly Sunny

    • 67
    • 85

    Chance Rain Showers

Today 31 Jul La Salle

Showers. A slight chance of Thunderstorms early in the Afternoon, then a chance of Thunderstorms late. Highs in the upper 70s. South Winds 10 to 15 Mph. Gusts up to 25 Mph in the afternoon. Chance of precipitation 90 percent.

Tonight 31 Jul La Salle

Showers with a chance of Thunderstorms. Near steady temperature in the upper 60s. East Winds 10 to 15 Mph. Gusts up to 25 Mph in the evening. Chance of precipitation 90 percent.

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Starved Rock State Park Temperature Statistics

July Temperature

Illinois Valley Regional Airport (7.5 miles)

  • Lowest 23 July, 2026

    53.6 °F

  • Average July

    76.4 °F

  • Highest 2 July, 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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