Illinois Beach State Park Weather Forecast

    • 45
    • 54

    Increasing Clouds

    • 57
    • 70

    Rain Showers Likely

    • 47
    • 72

    Rain Showers Likely

    • 45
    • 57

    Partly Sunny

    • 47
    • 58

    Rain Showers Likely

    • 47
    • 62

    Rain Showers Likely

Today 22 Apr Lake

Mostly sunny. Highs in the upper 60s Inland, but only in the lower to mid 50s near the lake. Northeast Winds 5 to 10 Mph.

Tonight 22 Apr Lake

Partly cloudy. Lows in the upper 40s. East Winds around 5 Mph, becoming south after midnight.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Illinois Beach State Park Temperature Statistics

April Temperature

Chicago/Waukegan Regional Airport (2.5 miles)

  • Lowest 7 April, 2026

    26.7 °F

  • Average April

    50.7 °F

  • Highest 12 April, 2026

    81.6 °F

Climate (2021–Present)

Chicago/Waukegan Regional Airport (2.5 miles)

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  • Average Low 2021–2026

    42.3 °F

  • Average 2021–2026

    51.1 °F

  • Average High 2021–2026

    59.8 °F
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