Chicago Weather: September
 |
Average Day Temperature: | 75.6°F |
|
Average Night Temperature: | 65.4°F |
|
Sea Water Temperature: | 67.9°F |
|
Number of Sunny Days: | 17 days |
| Sunshine Hours: | 11.8 - 13.1 hours | |
|
Number of Rainy Days: | 4 days |
| Precipitation Totals: | 2.3 in | |
| detailed information | ||
forecast
| Chicago |
Temperature
| Chicago |
Air Temperature in September, °F
The highest day temperature in September 2025 was 91°F. The lowest night temperature was 52°F. The average values for day and night temperatures during September were 78.9°F и 63.7°F respectivly.
Chicago Water Sea Temperature in September, °F
The average sea surface temperature in September 2025 for Chicago was 66.7°F. The maximum and minimum values were 60.0°F and 72.4°F respectively.
Most of the days in September are sunny but you can also expect cloudy and gloomy days.
Precipitation Totals in September, in
Precipitation total in September for Chicago is 2.3 in.
The average wind speed in September is 9.2 mph. It makes September one of the most windless months of the year for Chicago.
We are using day length and cloud cover information for each day of the month to calculate averages for this chart. Average sunny hours for Chicago in September is 8.4 hours.
Chicago on the Weather Map
| Boston |  |
+94 |
| Chicago | |
+82 |
| Hawaii |  |
+82 |
| Houston | |
+102 |
| Las Vegas | |
+124 |
| Los Angeles | |
+92 |
| Maui | |
+78 |
| Miami | |
+92 |
| Myrtle Beach |  |
+84 |
| New York | |
+84 |
| San Diego | |
+80 |
| San Francisco | |
+62 |
| Santa Monica | |
+80 |
| Sarasota | |
+92 |
| Washington | |
+88 |
| 1500 |  |
82°F | E 4 mph |
| 1800 |  |
78°F | SE 11 mph |
| 2100 |  |
72°F | NW 4 mph |
| 0000 | |
72°F | W 5 mph |
| 0300 |  |
72°F | NW 5 mph |
| 0600 | |
72°F | N 6 mph |
| 0900 |  |
72°F | N 7 mph |
| 1200 | |
76°F | NE 8 mph |