Average temperature in September is 22.4 °C
Average daytime temperature is 28.6 °C
Average night temperature is 17.3 °C
Absolute maximum temperature: 33.8 °C
Absolute minimum temperature: 11.9 °C
Number of sunny days: 21
Number of rainy days: 9
Number of snow days:
Precipitation sum: 27 mm
* Weather data for Washington 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 | 26.9 | 26.4 | 29.7 | 31.9 | 31.8 | 33.8 | 31.8 | 30.2 | 29.6 | 29.1 | 31.3 | 31.9 | 29.9 | 27.7 | 23.7 | 26.8 | 26.8 | 27.3 | 27.4 | 26.6 | 27.5 | 26.1 | 28.4 | 29.2 | 30.1 | 28.2 | 25.5 | 25 | 28 | 28.5 |
| Apparent max temperature | 28.3 | 26.8 | 32.5 | 34.3 | 35.1 | 36.7 | 36.1 | 33.7 | 33.5 | 33.5 | 35 | 36 | 33.4 | 30.4 | 27.1 | 27.7 | 28.6 | 27.1 | 29.1 | 26.7 | 27.7 | 25.9 | 29 | 31 | 31.1 | 30.1 | 25.7 | 25.8 | 30 | 30.4 |
| Mean temperature | 23.6 | 22 | 21.7 | 23.7 | 24.5 | 25.8 | 25.2 | 23.6 | 23.6 | 23.7 | 24.4 | 24.9 | 23.6 | 23.2 | 21.5 | 21.1 | 21.5 | 20.9 | 19.8 | 21.4 | 21.5 | 20.9 | 20.7 | 21.2 | 21.7 | 23.1 | 21.7 | 18.9 | 20.3 | 21.5 |
| Apparent mean temperature | 22.1 | 19 | 14.7 | 18 | 19.5 | 21.6 | 23.2 | 21.3 | 20.8 | 21.9 | 21.9 | 22.3 | 22.4 | 21.7 | 21 | 16.8 | 19.3 | 14.3 | 12 | 14.9 | 17.3 | 15.9 | 13.3 | 13.1 | 14.8 | 20.1 | 18.8 | 14 | 15.5 | 16.7 |
| Minimum temperature | 20.7 | 18.5 | 13.9 | 17.1 | 18.4 | 19.9 | 21.3 | 19 | 18.6 | 19.3 | 19.2 | 19.8 | 19.5 | 19.7 | 19.3 | 15.7 | 18.4 | 15.1 | 11.9 | 15.2 | 17.1 | 16.3 | 14.4 | 13.8 | 14.8 | 18.7 | 18.4 | 14.7 | 15.3 | 15.9 |
| Apparent min temperature | 25.1 | 22.5 | 23.3 | 25.5 | 26.4 | 28.3 | 28.2 | 26.7 | 26.5 | 26.9 | 27.8 | 28.4 | 27 | 26.1 | 23.9 | 22 | 23.5 | 20.5 | 20.2 | 21.5 | 21.6 | 20.9 | 20.5 | 21.7 | 22.1 | 24.4 | 22.4 | 18.9 | 21.2 | 23.1 |
| 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 | 10.2 | 11.8 | 12 | 10.1 | 11.4 | 9.7 | 10.4 | 11.4 | 8.1 | 10.3 | 11.3 | 9.1 | 10.9 | 8.7 | 11.2 | 8.5 | 11.2 | 11.2 | 9.1 | 7.4 | 11.1 | 11.1 | 11.1 | 11 | 8.5 | 6.7 | 11 | 10.9 | 10.9 |
| Precipitation (mm) | 0 | 0 | 0 | 0 | 0 | 0 | 9.2 | 0 | 2.8 | 1.8 | 0.1 | 2.4 | 0.2 | 0.6 | 2.5 | 0 | 7.5 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation hours | 0 | 0 | 0 | 0 | 0 | 0 | 7 | 0 | 5 | 6 | 1 | 2 | 2 | 5 | 9 | 0 | 9 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Wind speed (m/s) | 15 | 10.9 | 8.4 | 8.6 | 9.7 | 10.8 | 12 | 10.4 | 10 | 8.3 | 8.2 | 15.3 | 13.5 | 12.2 | 11.3 | 10.2 | 10.8 | 12.1 | 10.4 | 9.7 | 15.2 | 16.4 | 11.9 | 9.5 | 10 | 10 | 16.4 | 15.5 | 9.6 | 8.8 |
In September 2023, the highest daytime temperature in Washington was 33.8°C.
While the minimum temperature at night dropped to 11.9°C.
The average nighttime and daytime temperatures during September in Washington are 17.3°C and 28.6°C respectively.
The precipitation sum in September is about 27 mm.