Average temperature in September is 17.1 °C
Average daytime temperature is 24.2 °C
Average night temperature is 11.6 °C
Absolute maximum temperature: 33 °C
Absolute minimum temperature: 6.3 °C
Number of sunny days: 22
Number of rainy days: 8
Number of snow days:
Precipitation sum: 49 mm
* Weather data for Great Falls 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 | 27.3 | 33 | 31.5 | 25.2 | 24.3 | 26.4 | 26 | 24.3 | 22.5 | 22.7 | 26.1 | 27.5 | 25.8 | 22.7 | 26.9 | 28.9 | 30.4 | 28.4 | 24.6 | 19.9 | 16.7 | 15.1 | 20.5 | 23 | 24.6 | 26.2 | 22.9 | 17.5 | 17.4 | 16.4 |
| Apparent max temperature | 25.6 | 28.3 | 27.4 | 22.2 | 22.6 | 22.5 | 23.2 | 23.2 | 19 | 20.3 | 24.4 | 26.1 | 22.2 | 20.6 | 23.3 | 25.2 | 25.4 | 22.2 | 18.7 | 15.6 | 10.7 | 14 | 16.6 | 19.7 | 22.6 | 22.8 | 19.8 | 12.2 | 14.7 | 12.6 |
| Mean temperature | 18.8 | 23.4 | 24.5 | 18.7 | 17 | 19.6 | 19.1 | 18.1 | 15.4 | 15.4 | 17.8 | 20.1 | 19.6 | 17.4 | 17.6 | 20.2 | 22.1 | 22.5 | 16.8 | 13.4 | 10.3 | 11.3 | 14.2 | 14.6 | 15.7 | 21.5 | 15.2 | 12.5 | 11.3 | 10.2 |
| Apparent mean temperature | 10.9 | 14 | 16.6 | 13 | 10.4 | 10.8 | 10.8 | 11.5 | 8.6 | 7.7 | 9.9 | 10.6 | 12.5 | 9.2 | 5.8 | 9.2 | 11.6 | 12.4 | 7 | 3.9 | 3.6 | 7.2 | 9.3 | 4.8 | 6.9 | 13.5 | 7.9 | 3.4 | 2.5 | 4.3 |
| Minimum temperature | 12.6 | 16.4 | 18.6 | 14.1 | 11.4 | 12.3 | 12.7 | 13.9 | 9.8 | 9 | 11.7 | 13.3 | 14.8 | 11.4 | 8.6 | 12.8 | 14.8 | 18.1 | 9.4 | 6.6 | 7 | 9.5 | 11.2 | 7.7 | 9.3 | 17.5 | 9.7 | 9 | 6.3 | 8.2 |
| Apparent min temperature | 17.2 | 20.9 | 21.8 | 17.2 | 15.6 | 17.1 | 17.2 | 16.4 | 14 | 13.8 | 16 | 17.6 | 16.3 | 14.8 | 15.1 | 16.5 | 17.8 | 16.9 | 13.4 | 9.8 | 5.7 | 9.9 | 12.3 | 11.7 | 13.9 | 17.1 | 13.2 | 7.5 | 7.7 | 6.4 |
| 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) | 13.4 | 13.3 | 13.3 | 13.2 | 13.2 | 13.1 | 13.1 | 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) | 12.4 | 12.2 | 12.3 | 4 | 12.1 | 12 | 11.9 | 10.4 | 11.7 | 11.7 | 11.7 | 10.7 | 11.3 | 11.4 | 11.5 | 11.5 | 11.4 | 11 | 11.3 | 10 | 2 | 1.8 | 7 | 10.3 | 10.8 | 10.4 | 10.6 | 9 | 10.7 | 3.4 |
| Precipitation (mm) | 0 | 0 | 0 | 4.6 | 0 | 0 | 0 | 8.6 | 0 | 0 | 0 | 0 | 0.1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 7.3 | 4.7 | 22.3 | 0 | 0 | 0 | 0.7 | 0 | 0 | 0.8 |
| Precipitation hours | 0 | 0 | 0 | 9 | 0 | 0 | 0 | 5 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 13 | 17 | 11 | 0 | 0 | 0 | 4 | 0 | 0 | 1 |
| Wind speed (m/s) | 15.5 | 28.4 | 26.3 | 18.8 | 12.1 | 20.9 | 19.1 | 19.4 | 18.3 | 15.4 | 16.5 | 14.9 | 25.9 | 21.8 | 12.1 | 18.7 | 30.9 | 31.8 | 28.2 | 23.7 | 27.2 | 14.8 | 17.6 | 16.3 | 14.6 | 25.8 | 32.2 | 26.9 | 19.4 | 21.3 |
In September 2023, the highest daytime temperature in Great Falls was 33°C.
While the minimum temperature at night dropped to 6.3°C.
The average nighttime and daytime temperatures during September in Great Falls are 11.6°C and 24.2°C respectively.
The precipitation sum in September is about 49 mm.