Average temperature in September is 20.3 °C
Average daytime temperature is 26.1 °C
Average night temperature is 15.3 °C
Absolute maximum temperature: 31.8 °C
Absolute minimum temperature: 11.1 °C
Number of sunny days: 16
Number of rainy days: 14
Number of snow days:
Precipitation sum: 33 mm
* Weather data for Libertyville United States is based on climate observations for 2023 year
| September (°C) | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Maximum temperature | 27.7 | 31.2 | 31.7 | 31.8 | 30.7 | 29.5 | 24.6 | 22.8 | 23.9 | 25.5 | 27.4 | 23.7 | 24.3 | 23.2 | 24.4 | 24.1 | 21.3 | 21.9 | 25 | 27.6 | 25.4 | 27.7 | 26.2 | 25.9 | 27.3 | 27.4 | 23.6 | 23.7 | 25.1 | 26.9 |
| Apparent max temperature | 30 | 33.4 | 33.9 | 34.7 | 32.4 | 31.3 | 25.5 | 22.4 | 23.6 | 26.8 | 28.3 | 23.2 | 21.8 | 22.6 | 25.5 | 24.7 | 20.9 | 20.8 | 24 | 27 | 27.1 | 28.8 | 26.5 | 26.8 | 29.1 | 27.6 | 24.8 | 24.5 | 27 | 28.3 |
| Mean temperature | 20 | 23.2 | 26 | 26.2 | 25.8 | 25 | 21.7 | 19.9 | 19.7 | 19.4 | 20.6 | 20.2 | 17.6 | 17.2 | 17.9 | 18.1 | 17.3 | 16.8 | 17.7 | 19.7 | 20.9 | 21.2 | 20.8 | 19.1 | 20.8 | 21.6 | 19.1 | 18.7 | 18.5 | 19.4 |
| Apparent mean temperature | 12.9 | 16.5 | 24 | 24.5 | 25.5 | 23.8 | 18.7 | 16.8 | 13.9 | 13.5 | 14.3 | 17.7 | 10.6 | 9.9 | 10.3 | 11.7 | 13.9 | 11.2 | 10.9 | 12.1 | 18.6 | 15.8 | 14.3 | 11.3 | 14.5 | 15.9 | 16.8 | 14.9 | 13 | 12.8 |
| Minimum temperature | 13.3 | 16 | 21.3 | 21.6 | 22.5 | 22.2 | 18.8 | 15.8 | 14.8 | 13.5 | 14.2 | 17.3 | 11.7 | 11.1 | 11.5 | 12.4 | 13.5 | 12.2 | 11.7 | 13.1 | 17.4 | 15.6 | 14.9 | 13.3 | 14.6 | 16.4 | 16.5 | 14.6 | 12.9 | 13.1 |
| Apparent min temperature | 20.2 | 24.5 | 28.7 | 28.9 | 28.2 | 26.7 | 21.8 | 20.2 | 19.2 | 19.7 | 20.8 | 20.6 | 16.5 | 16.1 | 17.2 | 17.7 | 17 | 15.8 | 16.7 | 19 | 21.8 | 22.1 | 20.5 | 18.3 | 21.6 | 21.6 | 19.7 | 19.7 | 19.5 | 20.3 |
| September | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight duration (h) | 13.1 | 13 | 13 | 12.9 | 12.9 | 12.9 | 12.8 | 12.8 | 12.7 | 12.7 | 12.6 | 12.6 | 12.6 | 12.5 | 12.5 | 12.4 | 12.4 | 12.4 | 12.3 | 12.3 | 12.2 | 12.2 | 12.1 | 12.1 | 12 | 12 | 12 | 11.9 | 11.9 | 11.8 |
| Sunshine duration (h) | 12 | 12 | 11.9 | 11.9 | 10.2 | 10.4 | 7.2 | 6.2 | 10.2 | 11.7 | 9.6 | 8 | 11.6 | 11.6 | 11.6 | 8.8 | 10.1 | 11.3 | 11.3 | 10.3 | 6.5 | 11 | 11.2 | 10.7 | 10.9 | 10.9 | 5.7 | 9.7 | 10.8 | 10.8 |
| Precipitation (mm) | 0 | 0 | 0 | 0.6 | 4.8 | 1 | 0.4 | 0 | 0.8 | 0 | 0 | 4.8 | 0.1 | 0 | 0 | 0.4 | 1.2 | 0 | 0 | 0 | 7.9 | 0.1 | 0 | 0 | 0 | 0.2 | 9 | 1.2 | 0 | 0 |
| Precipitation hours | 0 | 0 | 0 | 6 | 6 | 5 | 3 | 0 | 5 | 0 | 0 | 9 | 1 | 0 | 0 | 3 | 7 | 0 | 0 | 0 | 13 | 1 | 0 | 0 | 0 | 2 | 9 | 9 | 0 | 0 |
| Wind speed (m/s) | 9.1 | 17.3 | 15.3 | 16.2 | 21.3 | 23.1 | 22.2 | 13.8 | 15.3 | 10.5 | 11.1 | 15.7 | 19.7 | 14.2 | 10.1 | 9 | 19.1 | 15.3 | 16 | 13.2 | 12.7 | 9.6 | 11.3 | 10.6 | 9.7 | 12.7 | 14 | 11.2 | 7.9 | 9.5 |
In September 2023, the highest daytime temperature in Libertyville was 31.8°C.
While the minimum temperature at night dropped to 11.1°C.
The average nighttime and daytime temperatures during September in Libertyville are 15.3°C and 26.1°C respectively.
The precipitation sum in September is about 33 mm.