Average temperature in September is 21 °C
Average daytime temperature is 27.4 °C
Average night temperature is 16.3 °C
Absolute maximum temperature: 33.8 °C
Absolute minimum temperature: 11.5 °C
Number of sunny days: 11
Number of rainy days: 19
Number of snow days:
Precipitation sum: 79 mm
* Weather data for Bilbao Spain 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 | 26.3 | 21.7 | 27.2 | 32.7 | 31.7 | 32 | 33.8 | 33 | 32.4 | 28.5 | 27.2 | 22.3 | 23.1 | 25.9 | 28 | 28 | 26.5 | 24 | 26.2 | 26.7 | 22.5 | 17.7 | 21.3 | 30.4 | 26.6 | 23.8 | 30.3 | 30.6 | 27.6 | 32.9 |
| Apparent max temperature | 29.8 | 23.9 | 29.5 | 34.6 | 33.5 | 36.7 | 36.3 | 35.7 | 35.5 | 32.2 | 30.8 | 23.8 | 24.9 | 28 | 29.6 | 28.6 | 27.2 | 24.8 | 28.1 | 27.3 | 20.1 | 17 | 21.7 | 30.3 | 28.5 | 25.9 | 32.1 | 32.3 | 30.8 | 35.9 |
| Mean temperature | 20.6 | 19.3 | 19.8 | 25.6 | 24.8 | 24.7 | 25.1 | 25.2 | 25.1 | 23.3 | 22 | 19.2 | 19.3 | 19.9 | 21.2 | 22.9 | 20.8 | 20.9 | 20 | 20.4 | 18.7 | 15 | 16.5 | 18.9 | 18.7 | 18 | 20.3 | 20.9 | 20.2 | 22.6 |
| Apparent mean temperature | 18.6 | 18.3 | 16 | 21.9 | 20.9 | 20.4 | 21.1 | 23.2 | 22.6 | 23.3 | 22.3 | 18.9 | 18 | 16.9 | 18.1 | 20.1 | 16.7 | 17.5 | 18.1 | 16.3 | 14.1 | 11.3 | 13 | 10.7 | 11 | 12 | 15.5 | 13.6 | 15 | 18.1 |
| Minimum temperature | 16.9 | 16.6 | 14.9 | 19.1 | 19 | 18.6 | 19.6 | 20.3 | 19.3 | 19.9 | 19.8 | 17.2 | 16.3 | 15.6 | 16.9 | 19.2 | 16.7 | 16.9 | 16.6 | 15.5 | 14.1 | 11.9 | 12.7 | 11.5 | 12.2 | 12.5 | 14.9 | 13.8 | 14.4 | 16.7 |
| Apparent min temperature | 22.7 | 21.6 | 21.9 | 26.7 | 27.2 | 27.5 | 27.5 | 28.1 | 28.2 | 26.8 | 24.8 | 20.9 | 21.1 | 21.7 | 23 | 24 | 21.5 | 20.3 | 21.5 | 21.5 | 18.1 | 14.6 | 16.7 | 19 | 19.2 | 19 | 21.1 | 21.7 | 21.9 | 25.1 |
| 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) | 13.2 | 13.2 | 13.1 | 13.1 | 13 | 13 | 12.9 | 12.9 | 12.8 | 12.8 | 12.7 | 12.7 | 12.6 | 12.6 | 12.5 | 12.5 | 12.4 | 12.4 | 12.3 | 12.3 | 12.2 | 12.2 | 12.1 | 12.1 | 12 | 12 | 11.9 | 11.9 | 11.8 | 11.8 |
| Sunshine duration (h) | 9.7 | 0.4 | 5.7 | 10 | 11.9 | 11.9 | 9.1 | 10.2 | 10.6 | 10.9 | 8.5 | 6.1 | 9.9 | 10.9 | 6.3 | 8.6 | 8.9 | 11.5 | 10.8 | 10.8 | 3.8 | 9.2 | 9.8 | 11.2 | 11.1 | 11 | 9.6 | 10.9 | 10.7 | 10.5 |
| Precipitation (mm) | 0 | 17.2 | 4 | 5.8 | 0.1 | 0 | 0 | 0.6 | 0.2 | 2.3 | 2.9 | 23.7 | 0.9 | 0.1 | 2 | 0.2 | 0.6 | 0.6 | 1.2 | 0 | 8.9 | 7.2 | 0.4 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Precipitation hours | 0 | 13 | 4 | 3 | 1 | 0 | 0 | 2 | 1 | 7 | 7 | 18 | 7 | 1 | 4 | 1 | 3 | 2 | 4 | 0 | 15 | 11 | 4 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Wind speed (m/s) | 15.8 | 9.7 | 13.9 | 24 | 15.2 | 12.1 | 13.7 | 9.4 | 13.7 | 11.9 | 12.6 | 14 | 11.5 | 11.2 | 15.3 | 16.6 | 18.8 | 22.2 | 14.7 | 19 | 23.7 | 20.1 | 10.3 | 13 | 10 | 11.9 | 21.7 | 12.3 | 13.5 | 7.2 |
In September 2023, the highest daytime temperature in Bilbao was 33.8°C.
While the minimum temperature at night dropped to 11.5°C.
The average nighttime and daytime temperatures during September in Bilbao are 16.3°C and 27.4°C respectively.
The precipitation sum in September is about 79 mm.