Average temperature in September is 26.7 °C
Average daytime temperature is 32.7 °C
Average night temperature is 21.5 °C
Absolute maximum temperature: 39.6 °C
Absolute minimum temperature: 17.7 °C
Number of sunny days: 18
Number of rainy days: 12
Number of snow days:
Precipitation sum: 87 mm
* Weather data for Mount Vernon United States is based on climate observations for 2023 year
| Settembre (°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 | 34.2 | 35.1 | 37.7 | 34.8 | 36.6 | 37.9 | 39.6 | 36.8 | 34.4 | 32.6 | 31.2 | 31.7 | 27.7 | 26.1 | 29.7 | 31.1 | 32.2 | 33.6 | 33.9 | 30.2 | 29.7 | 30.3 | 32.2 | 33.3 | 29.4 | 31.4 | 31.7 | 32.6 | 32.3 | 32.4 |
| Apparent max temperature | 35.5 | 36.5 | 38.9 | 37.2 | 40.4 | 42.2 | 41.6 | 40 | 36 | 32.9 | 31.2 | 33.8 | 29.6 | 27.6 | 32.1 | 32.6 | 32.8 | 34.4 | 33.6 | 31.9 | 33 | 34.5 | 36.8 | 37 | 33.5 | 34.3 | 34.7 | 35.7 | 35.4 | 35.4 |
| Mean temperature | 27.6 | 28.1 | 30.3 | 29.2 | 29.8 | 31.8 | 31.4 | 30.7 | 27.8 | 26.1 | 25.3 | 25.8 | 23.4 | 22.7 | 23.4 | 24.5 | 25.1 | 25.7 | 26.7 | 26.2 | 24.7 | 25.7 | 25.9 | 27.6 | 24.2 | 25.2 | 25.3 | 26.4 | 26.7 | 26.5 |
| Apparent mean temperature | 20.3 | 23.2 | 26.1 | 26.9 | 28.7 | 29.9 | 29.6 | 27.7 | 23.6 | 20.2 | 19.9 | 22.3 | 23 | 22 | 19.5 | 20 | 19.1 | 17.1 | 19.5 | 23.4 | 22.1 | 24.2 | 24.3 | 25.8 | 24.2 | 21.8 | 20.6 | 23.3 | 23.8 | 23.3 |
| Minimum temperature | 20.6 | 22.1 | 24.7 | 25.4 | 25.3 | 26.6 | 25.4 | 25.5 | 22.4 | 19.5 | 19.1 | 20.8 | 20.9 | 19.8 | 18.7 | 18.8 | 18.5 | 17.7 | 20.3 | 21.7 | 20.1 | 21.5 | 22.1 | 22.9 | 21.1 | 20.1 | 18.7 | 20.8 | 21.9 | 21.2 |
| Apparent min temperature | 27.9 | 28.8 | 31.5 | 31.2 | 32.7 | 34.8 | 34.6 | 32.9 | 30 | 26.3 | 25.3 | 27.6 | 25.3 | 24.6 | 24.8 | 26.1 | 25.4 | 25.5 | 25.9 | 26.8 | 27.2 | 28.6 | 29 | 30.6 | 28 | 28.1 | 27.8 | 28.7 | 28.7 | 28.8 |
| Settembre | 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) | 12.9 | 12.8 | 12.8 | 12.8 | 12.7 | 12.7 | 12.7 | 12.6 | 12.6 | 12.6 | 12.5 | 12.5 | 12.5 | 12.4 | 12.4 | 12.4 | 12.3 | 12.3 | 12.3 | 12.2 | 12.2 | 12.2 | 12.1 | 12.1 | 12.1 | 12 | 12 | 12 | 11.9 | 11.9 |
| Sunshine duration (h) | 11.9 | 11.9 | 11.6 | 11.1 | 11.7 | 11.7 | 11.7 | 11.6 | 11.3 | 11.6 | 10.2 | 8.5 | 5 | 4 | 11.5 | 11 | 11.5 | 11.5 | 11.2 | 7.8 | 8.4 | 8.4 | 11.2 | 10.4 | 9.6 | 11.1 | 11.1 | 11.1 | 11 | 11 |
| Precipitation (mm) | 0 | 0 | 0 | 2.9 | 0 | 0.3 | 0 | 1.6 | 0 | 0 | 0 | 1.5 | 3.6 | 1.9 | 0 | 0 | 0 | 0 | 0 | 3.1 | 4.4 | 20 | 2.2 | 24.4 | 21.5 | 0 | 0 | 0 | 0 | 0 |
| Precipitation hours | 0 | 0 | 0 | 3 | 0 | 1 | 0 | 1 | 0 | 0 | 0 | 5 | 8 | 8 | 0 | 0 | 0 | 0 | 0 | 5 | 6 | 11 | 1 | 9 | 9 | 0 | 0 | 0 | 0 | 0 |
| Wind speed (m/s) | 11.8 | 13.1 | 14.1 | 17.6 | 19.2 | 12.7 | 10.8 | 26 | 13.8 | 12.7 | 11.5 | 13 | 11.7 | 14.3 | 10.3 | 8.4 | 10.8 | 11.3 | 15.3 | 18.7 | 12.9 | 17.1 | 14 | 15.9 | 15 | 9.3 | 10.2 | 10.9 | 10.8 | 12.9 |
In September 2023, the highest daytime temperature in Mount Vernon was 39.6°C.
While the minimum temperature at night dropped to 17.7°C.
The average nighttime and daytime temperatures during September in Mount Vernon are 21.5°C and 32.7°C respectively.
The precipitation sum in September is about 87 mm.