Starved Rock State Park Weather Forecast

    • 57
    • 73

    Mostly Cloudy

    • 59
    • 77

    Chance Rain Showers

    • 57
    • 79

    Slight Chance Rain Showers

    • 60
    • 84

    Partly Sunny

    • 63
    • 85

    Chance Rain Showers

    • 64
    • 83

    Chance Rain Showers

Today 22 May La Salle

Mostly cloudy. Highs in the lower 70s. East Winds 10 to 15 Mph.

Tonight 22 May La Salle

Mostly cloudy. Lows in the upper 50s. Northeast Winds 5 to 10 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

    60 °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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