Prospect Heights Weather Forecast

    • 44
    • 56

    Decreasing Clouds

    • 48
    • 60

    Mostly Cloudy

    • 51
    • 61

    Rain Showers Likely

    • 53
    • 71

    Slight Chance Rain Showers

    • 56
    • 76

    Partly Sunny

    • 59
    • 77

    Mostly Cloudy

Today 20 May Northern Cook

Mostly cloudy in the Morning, then becoming partly cloudy. Highs in the upper 50s Inland, but only in the lower 50s near the lake. Northeast Winds 10 to 15 Mph.

Tonight 20 May Northern Cook

Partly cloudy. Lows in the mid 40s. Northeast Winds 10 to 15 Mph.

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Prospect Heights Temperature Statistics

May Temperature

Chicago / Wheeling, Pal-Waukee Airport (2.5 miles)

  • Lowest 2 May, 2026

    30.7 °F

  • Average May

    54.8 °F

  • Highest 17 May, 2026

    84.9 °F

Climate (2021–Present)

Chicago / Wheeling, Pal-Waukee Airport (2.5 miles)

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  • Average Low 2021–2026

    44.1 °F

  • Average 2021–2026

    52.9 °F

  • Average High 2021–2026

    61.6 °F
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