Starved Rock State Park Weather Forecast

    • 58
    • 78

    Thunderstorms

    • 58
    • 77

    Partly Sunny

    • 61
    • 81

    Rain Showers Likely

    • 50
    • 74

    Chance Thunderstorms

    • 47
    • 69

    Partly Sunny

    • 51
    • 70

    Chance Rain Showers

Today 21 Apr La Salle

Partly cloudy in the Morning, then becoming mostly cloudy. Isolated Showers and Thunderstorms early in the afternoon. Scattered Showers and Thunderstorms late. Breezy. Highs in the upper 70s. Southwest Winds 15 to 20 Mph, becoming 15 to 25 Mph in the afternoon. Gusts up to 35 Mph. Chance of precipitation 30 percent.

Tonight 21 Apr La Salle

Mostly cloudy in the Evening, then becoming partly cloudy. A slight chance of Showers and Thunderstorms in the evening. Lows in the mid 50s. West Winds 10 to 15 Mph, becoming northwest 5 to 10 Mph after midnight. Chance of precipitation 20 percent.

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Starved Rock State Park Temperature Statistics

April Temperature

Illinois Valley Regional Airport (7.5 miles)

  • Lowest 7 April, 2026

    30.2 °F

  • Average April

    54.1 °F

  • Highest 17 April, 2026

    84 °F

Climate (2021–Present)

Illinois Valley Regional Airport (7.5 miles)

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  • Average Low 2021–2026

    43.2 °F

  • Average 2021–2026

    52.8 °F

  • Average High 2021–2026

    62.5 °F
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