Average temperature in September is 26.4 °C
Average daytime temperature is 31.2 °C
Average night temperature is 22.1 °C
Absolute maximum temperature: 34 °C
Absolute minimum temperature: 18.1 °C
Number of sunny days: 10
Number of rainy days: 20
Number of snow days:
Precipitation sum: 49 mm
* Weather data for Onomichi Japan 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 | 31 | 30.5 | 33 | 33.7 | 32.1 | 32.6 | 33.3 | 31.1 | 30.7 | 30.7 | 28.8 | 30.5 | 31.1 | 30.1 | 31.4 | 34 | 33.3 | 31.2 | 33.2 | 31.3 | 32.5 | 30.5 | 29.5 | 28.6 | 30.3 | 29.9 | 31 | 28.7 | 30 | 31.3 |
| Apparent max temperature | 35.1 | 33.8 | 37.3 | 37.8 | 36.9 | 35.4 | 32.9 | 33.7 | 33 | 34.2 | 33.4 | 34.4 | 34.8 | 34.4 | 35.8 | 38.4 | 36.6 | 34.7 | 35.9 | 34.4 | 32.2 | 33.3 | 29.1 | 28.5 | 32.3 | 31.2 | 33.1 | 30.8 | 31.3 | 32.8 |
| Mean temperature | 27.3 | 26.8 | 28 | 29.1 | 27.4 | 26.3 | 27.1 | 25.5 | 26.7 | 25.4 | 24.7 | 26.3 | 27 | 26.3 | 27.2 | 28.3 | 28.2 | 26.8 | 27.2 | 27.4 | 26.3 | 24.4 | 23.7 | 25.3 | 26.5 | 25.4 | 27 | 24.6 | 24.5 | 25.8 |
| Apparent mean temperature | 28.9 | 26.9 | 27.5 | 28.7 | 26.3 | 23.3 | 24.9 | 22.9 | 25.4 | 23.8 | 24.5 | 26.2 | 27 | 27.7 | 27.3 | 28.1 | 28.1 | 27.5 | 26.1 | 27.5 | 25.7 | 22 | 18.3 | 22.1 | 26.2 | 24.1 | 26.3 | 21.1 | 19.4 | 23.3 |
| Minimum temperature | 24.6 | 22.8 | 23.4 | 24.8 | 23.2 | 21 | 22.2 | 20.4 | 22.1 | 20.9 | 21.1 | 22.4 | 22.6 | 22.8 | 22.7 | 23.9 | 24.2 | 23 | 22.4 | 23.2 | 22.6 | 19.6 | 18.7 | 22.5 | 23.7 | 21.4 | 23.5 | 18.9 | 18.1 | 21.7 |
| Apparent min temperature | 31.7 | 30.9 | 32.1 | 32.3 | 31.6 | 28.7 | 27.9 | 28.1 | 29.3 | 29 | 28.2 | 30.1 | 31 | 31 | 31.8 | 32.5 | 31.5 | 31 | 30.5 | 30.9 | 28.9 | 27.2 | 22.9 | 24.6 | 28.2 | 28.1 | 29.5 | 26.6 | 25.7 | 27.6 |
| 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) | 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 | 12.4 | 12.4 | 12.4 | 12.3 | 12.3 | 12.3 | 12.2 | 12.2 | 12.2 | 12.1 | 12.1 | 12.1 | 12 | 12 | 11.9 | 11.9 | 11.9 |
| Sunshine duration (h) | 3.9 | 3.8 | 11.9 | 10.8 | 10.8 | 11.8 | 11.8 | 11 | 11 | 6.8 | 9.9 | 11.7 | 9.1 | 3.2 | 11.4 | 11.6 | 11.4 | 11.1 | 10.4 | 9.8 | 4.4 | 8.8 | 10.3 | 9.6 | 9.3 | 6.3 | 11 | 9.5 | 11 | 9.8 |
| Precipitation (mm) | 0.1 | 0 | 0 | 6.5 | 3.5 | 2 | 0 | 0.6 | 0 | 11 | 7.8 | 0.1 | 0 | 1.1 | 1.4 | 0 | 0.6 | 2.2 | 4.9 | 0.4 | 0.9 | 1.7 | 0 | 0 | 0 | 0.3 | 0.3 | 1 | 0 | 2.8 |
| Precipitation hours | 1 | 0 | 0 | 5 | 9 | 5 | 0 | 3 | 0 | 15 | 6 | 1 | 0 | 6 | 3 | 0 | 3 | 6 | 5 | 3 | 3 | 6 | 0 | 0 | 0 | 1 | 2 | 5 | 0 | 8 |
| Wind speed (m/s) | 7.4 | 8.2 | 11.4 | 17.4 | 13.4 | 13.6 | 22.2 | 11.2 | 13.7 | 11.9 | 10.9 | 11 | 12 | 9.4 | 12.8 | 15.1 | 15.6 | 12.5 | 18.1 | 12.7 | 30.8 | 13.9 | 20 | 19.1 | 15.2 | 8.3 | 18.7 | 19.2 | 12.1 | 18.3 |
In September 2023, the highest daytime temperature in Onomichi was 34°C.
While the minimum temperature at night dropped to 18.1°C.
The average nighttime and daytime temperatures during September in Onomichi are 22.1°C and 31.2°C respectively.
The precipitation sum in September is about 49 mm.