Prospect Heights Weather Forecast

    • 63
    • 77

    Rain Showers

    • 56
    • 70

    Rain Showers Likely

    • 53
    • 65

    Slight Chance Rain Showers

    • 53
    • 63

    Slight Chance Rain Showers

    • 53
    • 65

    Mostly Cloudy

    • 54
    • 68

    Mostly Cloudy

Today 19 Sep Northern Cook

Thunderstorms likely in the morning. Showers. A chance of Thunderstorms in the afternoon. Some Thunderstorms may produce heavy rainfall in the morning. Highs in the mid 70s. Southeast Winds 5 to 10 Mph. Chance of precipitation near 100 percent.

Tonight 19 Sep Northern Cook

Thunderstorms likely until early morning. Showers. A chance of Thunderstorms late. Humid with Lows in the lower 60s. East Winds around 5 Mph, becoming north after midnight. Chance of precipitation near 100 percent.

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Prospect Heights Temperature Statistics

September Temperature

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

  • Lowest 14 September, 2026

    50.6 °F

  • Average September

    73.6 °F

  • Highest 2 September, 2026

    96.7 °F

Climate (2021–2026)

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

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  • Average Low 2021–2026

    44 °F

  • Average 2021–2026

    52.8 °F

  • Average High 2021–2026

    61.5 °F
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