Average temperature in September is 17.8 °C
Average daytime temperature is 22.8 °C
Average night temperature is 13 °C
Absolute maximum temperature: 29.2 °C
Absolute minimum temperature: 5.6 °C
Number of sunny days: 17
Number of rainy days: 13
Number of snow days:
Precipitation sum: 60 mm
* Weather data for Vianden Luxembourg 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 | 19.5 | 24.7 | 23.7 | 24.9 | 27.3 | 26.9 | 27.3 | 28.4 | 29.1 | 28.9 | 29.2 | 26.3 | 20.7 | 20.1 | 22.7 | 24.7 | 24.6 | 21.7 | 18 | 22.2 | 20.2 | 15.6 | 15.4 | 17.7 | 19.2 | 21.3 | 22.5 | 22.1 | 20.2 | 18.2 |
| Apparent max temperature | 19.8 | 27.3 | 25.5 | 24.7 | 28.2 | 26.9 | 28.2 | 30.9 | 31.5 | 31.3 | 31.4 | 29 | 20.3 | 20 | 22.4 | 26 | 26.4 | 20.6 | 15 | 20.4 | 19.6 | 12.9 | 12.9 | 16.2 | 18.5 | 21.2 | 22.5 | 22.8 | 19.1 | 17.8 |
| Mean temperature | 16.6 | 18.7 | 19 | 19.2 | 21.2 | 20.7 | 21.5 | 22 | 22.1 | 23 | 23.1 | 20.1 | 17.5 | 15.4 | 17.2 | 18.9 | 20.2 | 18.8 | 15.4 | 17.6 | 16.3 | 12.7 | 11 | 11.6 | 13.6 | 14.9 | 17.1 | 16.9 | 16.7 | 14.1 |
| Apparent mean temperature | 14.4 | 14.8 | 15.3 | 12.5 | 14.7 | 14.2 | 15.7 | 15.7 | 15.3 | 16.6 | 18.1 | 17.6 | 12.5 | 10.1 | 8.8 | 13 | 17.5 | 14.5 | 10.7 | 13.2 | 11.7 | 7.5 | 6 | 3.8 | 5.5 | 6.2 | 9.7 | 11 | 14 | 9.1 |
| Minimum temperature | 14.1 | 13.7 | 15.4 | 13.5 | 15.5 | 14.6 | 16.3 | 15.9 | 14.6 | 16 | 17.3 | 17.1 | 13 | 10.8 | 10.1 | 13.3 | 16.2 | 15.6 | 12.5 | 13.8 | 13.3 | 9.7 | 7.8 | 5.6 | 8.1 | 8.3 | 10.8 | 11.8 | 13.8 | 10.2 |
| Apparent min temperature | 16.7 | 20.3 | 19.9 | 18.6 | 21.2 | 20.7 | 21.8 | 23.6 | 23.8 | 24.6 | 24.8 | 21.6 | 17.4 | 14.9 | 16.6 | 19.8 | 21.7 | 18.1 | 13.1 | 16.4 | 15.6 | 10.3 | 9 | 10.3 | 12.5 | 14.3 | 17.2 | 17.2 | 16.3 | 13.6 |
| 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) | 13.5 | 13.4 | 13.4 | 13.3 | 13.3 | 13.2 | 13.1 | 13.1 | 13 | 13 | 12.9 | 12.8 | 12.8 | 12.7 | 12.7 | 12.6 | 12.5 | 12.5 | 12.4 | 12.3 | 12.3 | 12.2 | 12.2 | 12.1 | 12 | 12 | 11.9 | 11.8 | 11.8 | 11.7 |
| Sunshine duration (h) | 3.8 | 9.8 | 10.1 | 12.1 | 12.2 | 12.2 | 12.1 | 12 | 12 | 11.8 | 11.4 | 8.8 | 10.7 | 11.3 | 9.2 | 11.1 | 10.1 | 8 | 7.7 | 8.8 | 2.7 | 9.3 | 7.9 | 11 | 10.9 | 10.9 | 10.8 | 10.1 | 7.2 | 10.7 |
| Precipitation (mm) | 5.2 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 2.4 | 8.9 | 0.1 | 0 | 0 | 6.9 | 0.5 | 6.9 | 0.3 | 0.2 | 22.4 | 5.1 | 0.8 | 0 | 0 | 0 | 0 | 0 | 0.7 | 0 |
| Precipitation hours | 12 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 2 | 9 | 1 | 0 | 0 | 5 | 2 | 13 | 3 | 2 | 10 | 12 | 6 | 0 | 0 | 0 | 0 | 0 | 6 | 0 |
| Wind speed (m/s) | 20.9 | 10.6 | 10.9 | 16.2 | 16.4 | 12.2 | 12.1 | 9.6 | 9.8 | 6.6 | 6.9 | 13.5 | 14.8 | 12.7 | 11.5 | 13.8 | 13 | 25 | 26.2 | 25.4 | 20.2 | 21 | 18.2 | 10.9 | 9.5 | 9.2 | 9.3 | 10 | 23.2 | 6.9 |
In September 2023, the highest daytime temperature in Vianden was 29.2°C.
While the minimum temperature at night dropped to 5.6°C.
The average nighttime and daytime temperatures during September in Vianden are 13°C and 22.8°C respectively.
The precipitation sum in September is about 60 mm.