Average temperature in September is 15.8 °C
Average daytime temperature is 16.7 °C
Average night temperature is 15 °C
Absolute maximum temperature: 18.9 °C
Absolute minimum temperature: 13 °C
Number of sunny days: 14
Number of rainy days: 16
Number of snow days:
Precipitation sum: 24 mm
* Weather data for Kökar 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 | 16.5 | 16.2 | 16.7 | 18.1 | 18.9 | 16.1 | 16.7 | 17.2 | 17.1 | 17.3 | 17 | 17.2 | 17 | 14.9 | 16.8 | 16.7 | 16.5 | 15.4 | 17.5 | 17.4 | 17.9 | 18.1 | 16.3 | 16 | 15.6 | 15.7 | 16 | 16.4 | 15.9 | 15.3 |
| Apparent max temperature | 17.1 | 15 | 14.3 | 15.4 | 16.8 | 13.9 | 14.2 | 17.6 | 16.9 | 18 | 18 | 16.2 | 16.7 | 11.1 | 12.6 | 13.1 | 13.2 | 11.6 | 13.5 | 13.8 | 14.2 | 14.3 | 13.6 | 13.1 | 11 | 14.3 | 14.5 | 14.6 | 14.2 | 13.5 |
| Mean temperature | 16.1 | 15.6 | 15.4 | 16.9 | 16.9 | 15.3 | 16.2 | 16.5 | 16.7 | 17 | 16.8 | 16.9 | 15.5 | 14.3 | 15.1 | 16.4 | 14.2 | 14.3 | 16.7 | 16 | 17.3 | 17.3 | 15.5 | 14.9 | 14.9 | 15.3 | 15.5 | 15 | 15.2 | 14.3 |
| Apparent mean temperature | 12.2 | 12.8 | 12.4 | 12.8 | 12 | 10.1 | 12.6 | 14.4 | 14.2 | 15 | 14.5 | 14.2 | 8.8 | 9.1 | 10.2 | 11.2 | 7.4 | 8.7 | 7.9 | 7.7 | 12.8 | 12.8 | 11.6 | 9.2 | 9.3 | 10.3 | 12.2 | 11.9 | 11.1 | 7.4 |
| Minimum temperature | 15 | 14.2 | 14.3 | 16 | 16.1 | 14.8 | 15.4 | 15.7 | 16.4 | 16.5 | 16.6 | 16.6 | 14.6 | 13.5 | 13 | 15.9 | 13.2 | 13.4 | 15.5 | 14.9 | 16.8 | 16.5 | 14.9 | 14 | 14.1 | 14.8 | 14.5 | 13.4 | 14.9 | 13.3 |
| Apparent min temperature | 14.5 | 14.1 | 13.4 | 14.4 | 13.9 | 11.9 | 13.4 | 16.3 | 15.1 | 15.9 | 16.7 | 15.3 | 12.5 | 10 | 11.7 | 12.1 | 9.7 | 10.2 | 11.5 | 10.8 | 13.3 | 13.4 | 12.7 | 10.8 | 10.1 | 12.1 | 13.3 | 13.3 | 12.9 | 9.5 |
| 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 | 13.7 | 13.6 | 13.5 | 13.5 | 13.4 | 13.3 | 13.2 | 13.1 | 13 | 12.9 | 12.8 | 12.7 | 12.7 | 12.6 | 12.5 | 12.4 | 12.3 | 12.2 | 12.1 | 12 | 11.9 | 11.8 | 11.8 | 11.7 | 11.6 |
| Sunshine duration (h) | 6.2 | 7.6 | 11.7 | 12.5 | 11.3 | 12.4 | 11.2 | 11.9 | 10.2 | 9.5 | 7.6 | 2.4 | 1.2 | 10.9 | 8.5 | 11 | 9.1 | 11 | 2.9 | 7 | 11 | 10 | 3 | 10.8 | 6.6 | 9.9 | 6 | 4 | 0 | 9.6 |
| Precipitation (mm) | 4.1 | 0.9 | 0.6 | 0 | 0 | 0 | 0 | 0 | 0 | 0.2 | 0 | 0 | 0.1 | 0.1 | 0.9 | 0.3 | 1.2 | 0 | 7.8 | 1.9 | 0 | 0.7 | 2.2 | 0.3 | 0 | 0 | 0 | 0.4 | 0 | 1.8 |
| Precipitation hours | 9 | 5 | 4 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 1 | 1 | 4 | 3 | 4 | 0 | 8 | 4 | 0 | 1 | 3 | 3 | 0 | 0 | 0 | 1 | 0 | 4 |
| Wind speed (m/s) | 26 | 25.1 | 21.6 | 35.8 | 37.6 | 37.2 | 34.4 | 27.2 | 28.1 | 25.3 | 26.9 | 30.6 | 39.1 | 35.5 | 40.6 | 43.3 | 40.6 | 37.2 | 54.4 | 63.8 | 41.9 | 45.7 | 32.6 | 36.4 | 43 | 38.5 | 30.6 | 33.8 | 33.9 | 44.4 |
In September 2023, the highest daytime temperature in Kökar was 18.9°C.
While the minimum temperature at night dropped to 13°C.
The average nighttime and daytime temperatures during September in Kökar are 15°C and 16.7°C respectively.
The precipitation sum in September is about 24 mm.