Mount Prospect Weather Forecast

    • 66
    • 81

    Clearing Late

    • 64
    • 78

    Mostly Sunny

    • 65
    • 80

    Partly Sunny

    • 74
    • 87

    Mostly Cloudy

    • 66
    • 88

    Partly Sunny

    • 63
    • 81

    Partly Sunny

Today 5 Sep Northern Cook

Mostly cloudy. Highs in the lower 80s Inland, but only in the mid 70s near the lake. Northeast Winds around 10 Mph.

Tonight 5 Sep Northern Cook

Partly cloudy. Lows in the mid 60s. Northeast Winds 5 to 10 Mph.

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Mount Prospect Temperature Statistics

September Temperature

Chicago / Wheeling, Pal-Waukee Airport (3.7 miles)

  • Lowest 1 September, 2026

    72.6 °F

  • Average September

    83.6 °F

  • Highest 2 September, 2026

    96.7 °F

Climate (2021–2026)

Chicago / Wheeling, Pal-Waukee Airport (3.7 miles)

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  • Average Low 2021–2026

    44 °F

  • Average 2021–2026

    52.8 °F

  • Average High 2021–2026

    61.6 °F
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