Starved Rock State Park Weather Forecast

    • 49
    • 76

    Chance Thunderstorms

    • 44
    • 66

    Partly Sunny

    • 49
    • 68

    Mostly Cloudy

    • 52
    • 65

    Rain Showers Likely

    • 54
    • 74

    Chance Rain Showers

    • 58
    • 80

    Slight Chance Thunderstorms

Today 19 May La Salle

Mostly cloudy. Temperatures in the lower 70s. West Winds 10 to 15 Mph with Gusts up to 25 Mph.

Tonight 19 May La Salle

Mostly cloudy. Lows in the upper 40s. Northwest Winds 10 to 15 Mph.

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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

    59 °F

  • Highest 17 May, 2026

    87.8 °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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