Starved Rock State Park Weather Forecast

    • 59
    • 81

    Mostly Cloudy

    • 55
    • 77

    Partly Sunny

    • 53
    • 82

    Sunny

    • 58
    • 83

    Mostly Sunny

    • 64
    • 87

    Partly Sunny

    • 66
    • 87

    Chance Thunderstorms

    • 66
    • 87

    Chance Thunderstorms

Today 31 May La Salle

Mostly cloudy. Temperatures around 80. East Winds around 5 Mph.

Tonight 31 May La Salle

Mostly cloudy. A chance of Showers early in the Evening, then a chance of Sprinkles in the late evening and overnight. Lows in the upper 50s. East Winds around 5 Mph. Chance of precipitation 20 percent.

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Starved Rock State Park Temperature Statistics

May Temperature

Illinois Valley Regional Airport (7.5 miles)

  • Lowest 2 May, 2026

    33.8 °F

  • Average May

    63 °F

  • Highest 27 May, 2026

    91.4 °F

Climate (2021–Present)

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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