Average temperature in September is 20.1 °C
Average daytime temperature is 26.9 °C
Average night temperature is 14.4 °C
Absolute maximum temperature: 36 °C
Absolute minimum temperature: 9.8 °C
Number of sunny days: 18
Number of rainy days: 12
Number of snow days:
Precipitation sum: 48 mm
* Weather data for Grottoes 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 | 28.2 | 30.8 | 34.7 | 36 | 35 | 35.4 | 33.7 | 32 | 30 | 28.2 | 28.6 | 30.2 | 27.7 | 26.3 | 25.3 | 28.2 | 23.9 | 23.4 | 25.1 | 25.5 | 24.9 | 22.5 | 17.1 | 21.4 | 22.6 | 18.6 | 21 | 22.9 | 25.1 | 23.6 |
| Apparent max temperature | 28.6 | 33.1 | 36.6 | 38.1 | 37.9 | 38 | 33.7 | 33.5 | 31.9 | 31.6 | 30.9 | 30.5 | 28.7 | 25.4 | 23.9 | 27.7 | 23.8 | 22.5 | 25.1 | 25 | 24.7 | 20.8 | 15 | 21.8 | 23.2 | 18.4 | 21.1 | 23.5 | 26.3 | 23.1 |
| Mean temperature | 19.9 | 21 | 24.2 | 26 | 26.3 | 27.1 | 26.4 | 24.5 | 24.3 | 21.4 | 21.9 | 22.1 | 22 | 20.4 | 18 | 18.5 | 18.5 | 17.9 | 17 | 17 | 18.6 | 16.7 | 13.7 | 16.4 | 18.5 | 16.9 | 16.3 | 16.1 | 17.6 | 17.8 |
| Apparent mean temperature | 12 | 11.3 | 16.7 | 19.8 | 20.8 | 23 | 22.2 | 20.4 | 21.6 | 19.9 | 19.3 | 15.3 | 18.6 | 12.9 | 9.6 | 8.4 | 14.5 | 11.7 | 10 | 9.7 | 11.9 | 10.2 | 8.9 | 11.1 | 16.2 | 14.9 | 14.1 | 9.5 | 11.9 | 12.8 |
| Minimum temperature | 13.4 | 12.4 | 15.6 | 17.8 | 18 | 20 | 19.8 | 18.4 | 18.9 | 17.7 | 17 | 14.6 | 16.7 | 13.7 | 11.6 | 9.8 | 14.1 | 11.8 | 10.5 | 10.2 | 13 | 11.9 | 11.4 | 13.4 | 15.8 | 14.8 | 14.2 | 10.2 | 12.2 | 12.7 |
| Apparent min temperature | 19 | 21.2 | 25.8 | 28.4 | 28.9 | 29.6 | 27.7 | 26.4 | 26.2 | 23.8 | 24.3 | 23 | 23.6 | 19.3 | 16.2 | 17.4 | 18.7 | 17.9 | 16.7 | 16.7 | 18.2 | 15.5 | 11.2 | 15.5 | 18.9 | 17.1 | 16.3 | 16.1 | 18.2 | 17.8 |
| 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 | 13 | 12.9 | 12.9 | 12.9 | 12.8 | 12.8 | 12.7 | 12.7 | 12.7 | 12.6 | 12.6 | 12.5 | 12.5 | 12.5 | 12.4 | 12.4 | 12.3 | 12.3 | 12.3 | 12.2 | 12.2 | 12.1 | 12.1 | 12.1 | 12 | 12 | 11.9 | 11.9 | 11.8 |
| Sunshine duration (h) | 12.1 | 12 | 11.9 | 11.9 | 11.8 | 11.8 | 11.7 | 11.4 | 10.9 | 8.1 | 10.8 | 11.7 | 11.6 | 11.6 | 11.6 | 11.6 | 4.5 | 11.5 | 11.4 | 11.1 | 11.4 | 9.5 | 0 | 3.7 | 3.4 | 0.3 | 5.2 | 10.9 | 10 | 9.8 |
| Precipitation (mm) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0.2 | 0.8 | 4.5 | 0.2 | 0.7 | 0.7 | 0 | 0 | 0 | 5.4 | 0.4 | 0 | 0 | 0 | 0 | 21.6 | 10.7 | 0 | 2.5 | 0.3 | 0 | 0 | 0 |
| Precipitation hours | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 2 | 3 | 6 | 2 | 3 | 4 | 0 | 0 | 0 | 8 | 2 | 0 | 0 | 0 | 0 | 19 | 11 | 0 | 15 | 3 | 0 | 0 | 0 |
| Wind speed (m/s) | 12.1 | 13.1 | 12.9 | 14 | 15.9 | 12.6 | 12.6 | 17.6 | 15.8 | 9.7 | 6.1 | 11.2 | 10.3 | 12.1 | 12.4 | 9.3 | 18.8 | 14.3 | 8.7 | 10.3 | 10.2 | 14 | 27.3 | 23.7 | 11 | 11 | 11.2 | 10.5 | 10.4 | 15.1 |
In September 2023, the highest daytime temperature in Grottoes was 36°C.
While the minimum temperature at night dropped to 9.8°C.
The average nighttime and daytime temperatures during September in Grottoes are 14.4°C and 26.9°C respectively.
The precipitation sum in September is about 48 mm.