Average temperature in September is 9.6 °C
Average daytime temperature is 14.3 °C
Average night temperature is 3.5 °C
Absolute maximum temperature: 26 °C
Absolute minimum temperature: -5.1 °C
Number of sunny days: 14
Number of rainy days: 15
Number of snow days: 1
Precipitation sum: 46 mm
* Weather data for Bayan Mongolia 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 | 25.5 | 22.8 | 23 | 26 | 25.4 | 15.7 | 18.7 | 21.4 | 14.5 | 14.7 | 19 | 22.4 | 16.3 | 13.3 | 11.7 | 11.2 | 7.3 | 8.4 | 13.3 | 14.5 | 14.9 | 10.6 | 11.3 | 11.6 | 2.5 | 5.8 | 5.3 | 4.5 | 7.9 | 10.5 |
| Apparent max temperature | 23 | 18.7 | 20.1 | 21.8 | 19.1 | 12.8 | 14.8 | 17.4 | 10.8 | 11.4 | 13.6 | 19.4 | 14.4 | 10.1 | 8.7 | 7.3 | 3.8 | 5.8 | 8.2 | 11.3 | 10.3 | 8.1 | 7.8 | 4.7 | -2 | 1.5 | -2.5 | 1.4 | 4.5 | 7.1 |
| Mean temperature | 20.8 | 17.7 | 17.7 | 21.2 | 19.1 | 11 | 13.3 | 15.8 | 10.6 | 9.7 | 14.5 | 17.7 | 11.8 | 9.2 | 7.5 | 6.5 | 3.6 | 4.4 | 8.9 | 8.5 | 9.8 | 6.5 | 6.8 | 5.1 | -0.6 | 3.5 | -0.1 | -0.6 | 2.7 | 5.4 |
| Apparent mean temperature | 10.2 | 6 | 7.7 | 8.2 | 8.7 | 1.9 | 1.5 | 2.3 | 2.2 | -1.2 | -0.2 | 4 | 3 | -0.7 | -1.4 | -2.7 | -2.7 | -3.9 | -3.2 | -4.8 | -3.9 | -2.4 | -3.3 | -7.1 | -9.3 | -8.8 | -9.7 | -10.5 | -8.9 | -6.3 |
| Minimum temperature | 13.5 | 11.8 | 12.8 | 13.2 | 10.6 | 6.4 | 6.5 | 7 | 4.7 | 4.2 | 4.9 | 8.8 | 5.4 | 3.3 | 2 | 0.8 | 0.9 | 0.9 | 1.4 | 0.8 | 1.5 | 2.2 | 1.9 | -2.4 | -2.9 | -2.7 | -4.7 | -5.1 | -3.2 | -0.9 |
| Apparent min temperature | 17.5 | 13.1 | 13.4 | 16.3 | 14.1 | 8.1 | 9.1 | 11.9 | 7.1 | 5.8 | 9.5 | 13.5 | 9.3 | 6.3 | 4.1 | 3.2 | 0.5 | 1 | 3.5 | 3.8 | 5.5 | 3.3 | 2.4 | -1.1 | -5.6 | -2.6 | -5.8 | -5.2 | -2 | 0.8 |
| 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) | 13.4 | 13.3 | 13.3 | 13.2 | 13.1 | 13.1 | 13 | 13 | 12.9 | 12.9 | 12.8 | 12.8 | 12.7 | 12.7 | 12.6 | 12.5 | 12.5 | 12.4 | 12.4 | 12.3 | 12.3 | 12.2 | 12.2 | 12.1 | 12 | 12 | 11.9 | 11.9 | 11.8 | 11.8 |
| Sunshine duration (h) | 12.1 | 12.1 | 11 | 12 | 10.3 | 7.1 | 11.6 | 11.4 | 9.7 | 11.4 | 9 | 11.3 | 4.3 | 11.1 | 11.1 | 11 | 6.6 | 5.7 | 11 | 11 | 8.2 | 7 | 11 | 11 | 10.6 | 8.5 | 9.8 | 10.9 | 10.8 | 10.8 |
| Precipitation (mm) | 0 | 0 | 0 | 0 | 1.8 | 1.8 | 0 | 0.4 | 2.4 | 0 | 0 | 0 | 4.4 | 1.8 | 0.6 | 0.8 | 8.6 | 2.7 | 0 | 0 | 1.9 | 1.8 | 1.8 | 7.9 | 0 | 0.2 | 6.9 | 0 | 0 | 0 |
| Precipitation hours | 0 | 0 | 0 | 0 | 4 | 4 | 0 | 2 | 4 | 0 | 0 | 0 | 8 | 6 | 4 | 3 | 13 | 9 | 0 | 0 | 5 | 4 | 5 | 9 | 0 | 2 | 13 | 0 | 0 | 0 |
| Wind speed (m/s) | 19.8 | 18.6 | 20 | 28.9 | 44.5 | 20.7 | 18.1 | 17.7 | 23.2 | 17.2 | 24 | 26.3 | 19.6 | 16.9 | 13 | 15.3 | 17.7 | 16.8 | 26.6 | 20.7 | 22.3 | 17 | 27.3 | 41.2 | 22.9 | 39.8 | 42.8 | 19.3 | 19.8 | 19.5 |
In September 2023, the highest daytime temperature in Bayan was 26°C.
While the minimum temperature at night dropped to -5.1°C.
The average nighttime and daytime temperatures during September in Bayan are 3.5°C and 14.3°C respectively.
The precipitation sum in September is about 46 mm.