Average temperature in September is 23.8 °C
Average daytime temperature is 31.1 °C
Average night temperature is 16.8 °C
Absolute maximum temperature: 37.8 °C
Absolute minimum temperature: 12.7 °C
Number of sunny days: 21
Number of rainy days: 9
Number of snow days:
Precipitation sum: 16 mm
* Weather data for Santa Rosa 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 | 34.9 | 34.9 | 36.3 | 35.4 | 32.8 | 34.3 | 37.8 | 36.3 | 33.8 | 34.2 | 31.6 | 20.6 | 26.2 | 25 | 25.1 | 23.3 | 27 | 30.7 | 31.4 | 31.2 | 30.3 | 32.2 | 31.1 | 27.2 | 27.6 | 32.1 | 32.8 | 33.1 | 33.3 | 31.4 |
| Apparent max temperature | 31.3 | 32.1 | 34.4 | 30.2 | 31.3 | 31.6 | 34.1 | 32.6 | 33.5 | 31.5 | 28.2 | 18.1 | 25.3 | 26.8 | 25.8 | 22.9 | 25.8 | 27.7 | 26 | 27.9 | 28 | 26.6 | 25.6 | 26.5 | 26.1 | 29.1 | 29.8 | 27.8 | 28.9 | 25.8 |
| Mean temperature | 28.2 | 27.3 | 28.6 | 29 | 25.9 | 25.9 | 29.7 | 27.9 | 26.7 | 25.8 | 23 | 16.9 | 18.8 | 18.9 | 18.9 | 18.1 | 19 | 22.3 | 24 | 22 | 23.2 | 24.8 | 25.2 | 22.7 | 21.2 | 22.7 | 23.5 | 24 | 26.2 | 24.7 |
| Apparent mean temperature | 16.9 | 15.5 | 17.2 | 18.7 | 16.6 | 14.7 | 18.5 | 15 | 18.2 | 17.5 | 14 | 13.4 | 13.1 | 14.7 | 13.6 | 13.5 | 12.1 | 14 | 14.6 | 10.7 | 14.2 | 16.9 | 13.5 | 15.2 | 12.2 | 14.5 | 13.6 | 12.3 | 13.3 | 14.5 |
| Minimum temperature | 19.5 | 18.6 | 19.9 | 21 | 19.1 | 17.5 | 20.5 | 18.9 | 19.3 | 18.2 | 17.6 | 14.4 | 14.7 | 14.4 | 13.6 | 15.1 | 12.7 | 15 | 17.3 | 13.2 | 15.7 | 18.5 | 18.5 | 17.1 | 13.9 | 15.8 | 14.8 | 14.7 | 16.9 | 17 |
| Apparent min temperature | 24 | 23.7 | 25.2 | 25.3 | 23.1 | 23.5 | 26 | 24 | 24.8 | 23.7 | 21.5 | 15.3 | 17.3 | 18.9 | 18.8 | 16.8 | 18.2 | 20 | 20.5 | 18.6 | 20.3 | 21.1 | 19.8 | 19.7 | 19.5 | 20.8 | 20.8 | 20.1 | 21.7 | 20.7 |
| 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 | 12.9 | 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 | 12.3 | 12.3 | 12.3 | 12.2 | 12.2 | 12.2 | 12.1 | 12.1 | 12.1 | 12 | 12 | 11.9 | 11.9 | 11.9 |
| Sunshine duration (h) | 12 | 12 | 12 | 12 | 11.9 | 11.9 | 11.9 | 11.9 | 11.8 | 9.8 | 9.4 | 4.4 | 7.4 | 9.5 | 11.6 | 9.7 | 11.5 | 11.4 | 11.5 | 11.3 | 9.8 | 11.4 | 10.9 | 10.8 | 11.2 | 11.2 | 11.1 | 11 | 11 | 10.9 |
| Precipitation (mm) | 0 | 0 | 0.1 | 0 | 0 | 0 | 0 | 0 | 0 | 0.5 | 8.5 | 4.5 | 0.6 | 1.5 | 0.1 | 0.1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0.3 |
| Precipitation hours | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 2 | 4 | 7 | 5 | 1 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 2 |
| Wind speed (m/s) | 33 | 23.1 | 26 | 33.4 | 30.7 | 17.7 | 24.7 | 24.8 | 23.1 | 20.2 | 35.7 | 23.4 | 20.5 | 19.9 | 15 | 28.2 | 14.3 | 22 | 27.4 | 24.1 | 28.5 | 28.4 | 30.8 | 30.8 | 15 | 16.3 | 42.2 | 29.4 | 27.2 | 36.9 |
In September 2023, the highest daytime temperature in Santa Rosa was 37.8°C.
While the minimum temperature at night dropped to 12.7°C.
The average nighttime and daytime temperatures during September in Santa Rosa are 16.8°C and 31.1°C respectively.
The precipitation sum in September is about 16 mm.