Chicago Weather Forecast
- 75
- 89
Chance Thunderstorms
- 69
- 79
Becoming Sunny
- 67
- 77
Mostly Sunny
- 69
- 77
Partly Sunny
- 74
- 86
Chance Rain Showers
- 70
- 89
Chance Rain Showers
- 66
- 79
Partly Sunny
Today 4 Sep Central Cook
Mostly sunny. A slight chance of Showers and Thunderstorms early in the afternoon. Highs in the lower 90s. South Winds 10 to 15 Mph. Chance of precipitation 20 percent. Heat index Values up to 100.
Tonight 4 Sep Central Cook
Partly cloudy. A slight chance of Showers and Thunderstorms early in the Evening, then a chance of Showers and Thunderstorms in the late evening and early morning. A slight chance of Showers and Thunderstorms late. Patchy fog late. Lows in the mid 70s. Northwest Winds around 5 Mph, becoming northeast after midnight. Chance of precipitation 40 percent.
Chicago Temperature Statistics
September Temperature
Chicago, Chicago Midway Airport (8.7 miles)
Lowest 1 September, 2026
78.1 °FAverage September
85.8 °FHighest 2 September, 2026
96.1 °F
Climate (2021–2026)
Chicago, Chicago Midway Airport (8.7 miles)
Average Low 2021–2026
46.7 °FAverage 2021–2026
54.3 °FAverage High 2021–2026
61.9 °F