Average temperature in September is 15.6 °C
Average daytime temperature is 16.4 °C
Average night temperature is 14.8 °C
Absolute maximum temperature: 18.2 °C
Absolute minimum temperature: 12.8 °C
Number of sunny days: 15
Number of rainy days: 15
Number of snow days:
Precipitation sum: 38 mm
* Weather data for Brändö Åland 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 | 16.8 | 16.5 | 16.2 | 18.2 | 17.9 | 15.5 | 16.4 | 16.6 | 16.9 | 17.4 | 17.3 | 17.1 | 16.4 | 14.8 | 16.2 | 16.3 | 15.9 | 14.9 | 17 | 17 | 17.5 | 17.9 | 16.3 | 15.5 | 15.3 | 15.2 | 15.7 | 16.3 | 15.6 | 15.4 |
| Apparent max temperature | 17.2 | 15.5 | 14.7 | 16.3 | 17 | 13.9 | 14.3 | 17.7 | 15.8 | 18.9 | 19.4 | 16.2 | 15.3 | 10.8 | 12.6 | 13 | 12.8 | 12.5 | 13.2 | 13.8 | 14 | 14.2 | 13.7 | 13.3 | 11 | 13.8 | 14.2 | 13.8 | 14.1 | 14.1 |
| Mean temperature | 16.4 | 15.7 | 15.5 | 16.6 | 16.7 | 14.8 | 15.9 | 16.2 | 16.5 | 16.9 | 16.7 | 16.6 | 15.2 | 14.1 | 14.7 | 16 | 13.8 | 14.1 | 16 | 15.2 | 16.9 | 17.1 | 15.3 | 14.7 | 14.6 | 14.9 | 15.5 | 15 | 15.1 | 14.4 |
| Apparent mean temperature | 13.4 | 12.5 | 13 | 12.7 | 11.3 | 9.1 | 12.6 | 14.6 | 13.6 | 14.4 | 14.3 | 14 | 9 | 9 | 10 | 11.5 | 7.1 | 8.4 | 8 | 7.8 | 12.8 | 12.5 | 11.9 | 9.9 | 8.5 | 10.7 | 12.3 | 12.4 | 11.4 | 7.8 |
| Minimum temperature | 15.6 | 14.6 | 15 | 15.3 | 15.8 | 14.5 | 14.9 | 15.9 | 16.1 | 16.1 | 16.4 | 16 | 14.5 | 13.3 | 13 | 15.6 | 12.8 | 13.6 | 14.7 | 13.8 | 16.3 | 16.5 | 14.7 | 13.9 | 13.5 | 14.7 | 15 | 14.1 | 14.8 | 13.4 |
| Apparent min temperature | 14.8 | 14 | 13.8 | 14.6 | 14.3 | 11 | 13.5 | 15.7 | 14.5 | 15.9 | 16.5 | 14.8 | 11.9 | 9.7 | 11.4 | 12.3 | 9.3 | 10.3 | 11.1 | 10.9 | 13.5 | 13.3 | 12.5 | 11.7 | 10 | 12 | 13.5 | 13.2 | 12.8 | 10.2 |
| 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) | 14.2 | 14.1 | 14 | 13.9 | 13.8 | 13.8 | 13.7 | 13.6 | 13.5 | 13.4 | 13.3 | 13.2 | 13.1 | 13 | 12.9 | 12.8 | 12.8 | 12.7 | 12.6 | 12.5 | 12.4 | 12.3 | 12.2 | 12.1 | 12 | 11.9 | 11.8 | 11.7 | 11.7 | 11.6 |
| Sunshine duration (h) | 6.2 | 9.1 | 11.3 | 12.6 | 11.5 | 12.4 | 10.8 | 11.6 | 10.4 | 11.7 | 7.4 | 0.3 | 6 | 11.1 | 8.2 | 10.7 | 9.1 | 11 | 2.6 | 7.2 | 11 | 10 | 4.6 | 10.8 | 7.7 | 10 | 5.7 | 6.4 | 0.1 | 9.4 |
| Precipitation (mm) | 4.1 | 2.5 | 0.4 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0.1 | 1.8 | 0.1 | 2.8 | 0.3 | 2.2 | 0 | 9.4 | 4.3 | 0 | 1.2 | 3.3 | 0 | 0 | 0 | 0 | 1.5 | 0 | 4.3 |
| Precipitation hours | 11 | 11 | 4 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 5 | 1 | 6 | 2 | 5 | 0 | 9 | 3 | 0 | 4 | 4 | 0 | 0 | 0 | 0 | 1 | 0 | 10 |
| Wind speed (m/s) | 29.2 | 26.4 | 23 | 30.3 | 40.4 | 39.3 | 30.2 | 23.6 | 29.4 | 26.7 | 27.5 | 30.3 | 37.1 | 34.1 | 35.7 | 35.2 | 39.5 | 36.5 | 47.9 | 47.8 | 37.8 | 43.3 | 31 | 31.8 | 47.4 | 36.2 | 31.8 | 32 | 32.3 | 41 |
In September 2023, the highest daytime temperature in Brändö was 18.2°C.
While the minimum temperature at night dropped to 12.8°C.
The average nighttime and daytime temperatures during September in Brändö are 14.8°C and 16.4°C respectively.
The precipitation sum in September is about 38 mm.