Average temperature in September is 23.8 °C
Average daytime temperature is 30.1 °C
Average night temperature is 19.4 °C
Absolute maximum temperature: 36.8 °C
Absolute minimum temperature: 11.6 °C
Number of sunny days: 6
Number of rainy days: 24
Number of snow days:
Precipitation sum: 107 mm
* Weather data for Nagano 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 | 36.8 | 33 | 34.9 | 32 | 33.8 | 26.3 | 27.1 | 26.3 | 31.7 | 32.4 | 32.6 | 32 | 30.4 | 32.7 | 28.8 | 32.7 | 35.4 | 32.9 | 31.9 | 28.5 | 29.3 | 25.2 | 22.8 | 25.9 | 27.5 | 26.8 | 28.2 | 29.3 | 25.4 | 30.8 |
| Apparent max temperature | 38 | 34.6 | 38.1 | 35.9 | 38.5 | 30 | 28.7 | 26.8 | 36.4 | 36.7 | 34.3 | 35.2 | 34.6 | 35.9 | 31.8 | 37.1 | 38.5 | 36.9 | 34.8 | 30.5 | 30.3 | 27 | 21.3 | 26.2 | 26.9 | 28.1 | 30.4 | 33.7 | 26.5 | 31.6 |
| Mean temperature | 27.2 | 26 | 28 | 26.2 | 25.7 | 22.3 | 23.6 | 22.1 | 25.2 | 26.4 | 25.6 | 25.2 | 24.2 | 25.8 | 24.6 | 25.4 | 26.7 | 26 | 24.7 | 23.2 | 24 | 20.6 | 17.9 | 18 | 19.7 | 21.7 | 22.8 | 22.4 | 20 | 21.7 |
| Apparent mean temperature | 20.9 | 22.7 | 27.2 | 24.2 | 24 | 22.8 | 23.9 | 20.3 | 25.8 | 25.9 | 23.7 | 24.5 | 21.7 | 25.5 | 23.6 | 24.8 | 24.2 | 24.1 | 23.3 | 23.4 | 21 | 20.5 | 14.1 | 10.9 | 14.2 | 21.3 | 22.4 | 18.7 | 17.4 | 19.5 |
| Minimum temperature | 18.7 | 19.6 | 23.7 | 20.7 | 20.6 | 19.8 | 21.2 | 18.1 | 22 | 22.5 | 20.7 | 21.3 | 19 | 22 | 20.2 | 21.3 | 20.7 | 21 | 20.3 | 20.6 | 19.4 | 18.7 | 13.9 | 11.6 | 14 | 19.1 | 19.7 | 17.2 | 15.9 | 17.8 |
| Apparent min temperature | 29.3 | 29 | 31.7 | 30.1 | 29.9 | 25.7 | 25.7 | 23.6 | 29 | 30.1 | 28.6 | 28.5 | 27.6 | 28.9 | 28.6 | 29.8 | 30.3 | 29.5 | 27.9 | 25.7 | 26.6 | 22.4 | 17.8 | 18.1 | 19.8 | 23.4 | 25.6 | 24.6 | 21.2 | 23.3 |
| 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 | 12.9 | 12.9 | 12.9 | 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 | 12.2 | 12.2 | 12.2 | 12.1 | 12.1 | 12.1 | 12 | 12 | 11.9 | 11.9 | 11.9 |
| Sunshine duration (h) | 11.9 | 11 | 11.4 | 9.8 | 11.5 | 4.4 | 7.7 | 4.8 | 11.6 | 9.6 | 10.3 | 11.1 | 11.3 | 10.2 | 11 | 10.5 | 11.2 | 11.2 | 10.2 | 7.3 | 1.1 | 7.2 | 7.3 | 10.1 | 10.6 | 7.5 | 9.2 | 10.5 | 10 | 9.9 |
| Precipitation (mm) | 0 | 0 | 1.1 | 3 | 4.2 | 13.7 | 17.4 | 7.4 | 0.3 | 0.8 | 0.5 | 0.2 | 0.5 | 0 | 1.6 | 12.6 | 0.6 | 0.2 | 2.1 | 0.6 | 17.7 | 1.7 | 0.1 | 0 | 0 | 3 | 5.7 | 7.9 | 0 | 4.5 |
| Precipitation hours | 0 | 0 | 6 | 5 | 7 | 11 | 4 | 4 | 3 | 2 | 1 | 2 | 4 | 0 | 5 | 6 | 4 | 2 | 8 | 4 | 19 | 6 | 1 | 0 | 0 | 9 | 9 | 17 | 0 | 8 |
| Wind speed (m/s) | 19.5 | 16.3 | 13.7 | 10.5 | 16 | 11.1 | 13.6 | 15.1 | 15.6 | 11.7 | 12.6 | 16.3 | 9.4 | 16.1 | 13.9 | 14.6 | 13 | 15 | 17.7 | 16.3 | 18.1 | 16.1 | 18 | 11.2 | 9.4 | 9.4 | 12.7 | 12.1 | 16.9 | 20.8 |
In September 2023, the highest daytime temperature in Nagano was 36.8°C.
While the minimum temperature at night dropped to 11.6°C.
The average nighttime and daytime temperatures during September in Nagano are 19.4°C and 30.1°C respectively.
The precipitation sum in September is about 107 mm.