Chicago Weather Forecast

    • 73
    • 90

    Slight Chance Thunderstorms

    • 56
    • 74

    Mostly Cloudy

    • 55
    • 64

    Partly Sunny

    • 58
    • 69

    Mostly Sunny

    • 63
    • 73

    Chance Thunderstorms

    • 56
    • 72

    Chance Thunderstorms

Today 20 Sep Cook

Partly sunny with a 20 percent chance of Showers and Thunderstorms. Near record breaking heat likely. Highs around 90. Highest heat index Readings 96 to 101 in the afternoon. South Winds 10 to 20 Mph.

Tonight 20 Sep Cook

Mostly clear in the Evening, then partly cloudy with a 20 percent chance of Showers and Thunderstorms after midnight. Breezy. Lows in the lower 70s. Southwest Winds 15 to 25 Mph with Gusts up to 35 Mph.

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Chicago Temperature Statistics

September Temperature

Chicago, Chicago Midway Airport (8.7 miles)

  • Lowest 12 September, 2018

    57 °F
  • Average September

    71.2 °F
  • Highest 17 September, 2018

    91 °F

Climate (2010–Present)

Chicago, Chicago Midway Airport (8.7 miles)

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  • Average Low 2010–Present

    45.7 °F
  • Average 2010–Present

    53.5 °F
  • Average High 2010–Present

    60.9 °F
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