Grassy Lake Forest Preserve Weather Forecast

    • 70
    • 81

    Slight Chance Thunderstorms

    • 72
    • 89

    Slight Chance Thunderstorms

    • 73
    • 90

    Slight Chance Thunderstorms

    • 71
    • 92

    Slight Chance Thunderstorms

    • 69
    • 86

    Slight Chance Thunderstorms

    • 67
    • 85

    Partly Sunny

Today 30 Aug Lake

Mostly cloudy. Showers and scattered Thunderstorms in the Morning, then scattered Showers with isolated Thunderstorms in the afternoon. Breezy. Highs in the lower 80s. Southwest Winds 10 to 15 Mph with Gusts up to 30 Mph. Chance of precipitation 80 percent.

Tonight 30 Aug Lake

Mostly cloudy. Scattered Showers with isolated Thunderstorms early in the evening. Scattered Showers and Thunderstorms late. Lows in the lower 70s. South Winds 5 to 10 Mph. Chance of precipitation 40 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Grassy Lake Forest Preserve Temperature Statistics

August Temperature

Chicago / Wheeling, Pal-Waukee Airport (13.7 miles)

  • Lowest 24 August, 2026

    56.6 °F

  • Average August

    73.2 °F

  • Highest 7 August, 2026

    87.7 °F

Climate (2021–2026)

Chicago / Wheeling, Pal-Waukee Airport (13.7 miles)

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  • Average Low 2021–2026

    43.9 °F

  • Average 2021–2026

    52.8 °F

  • Average High 2021–2026

    61.5 °F
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