Average temperature in September is 15.2 °C
Average daytime temperature is 18 °C
Average night temperature is 12.6 °C
Absolute maximum temperature: 24.7 °C
Absolute minimum temperature: 9.5 °C
Number of sunny days: 12
Number of rainy days: 18
Number of snow days:
Precipitation sum: 146 mm
* Weather data for Risør Norway 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 | 20.7 | 19 | 16.4 | 22.4 | 24.7 | 18.3 | 18.4 | 18.8 | 18.5 | 23.5 | 18.8 | 20.3 | 17.7 | 13.9 | 16.6 | 17.4 | 15 | 16.6 | 15.6 | 17.5 | 16.8 | 17.4 | 17.3 | 15.9 | 15.9 | 16.9 | 18.5 | 17.2 | 16.4 | 17.9 |
| Apparent max temperature | 20.1 | 18.7 | 15.3 | 22.1 | 24.6 | 17.4 | 18.7 | 20 | 19.7 | 24.1 | 18.5 | 18 | 15.1 | 13.3 | 15.4 | 16.7 | 12 | 15.2 | 14.8 | 16.1 | 15.8 | 15.9 | 14.6 | 13.8 | 13.9 | 15.9 | 16.3 | 15.2 | 14.1 | 14.3 |
| Mean temperature | 16.3 | 16 | 15.3 | 18.5 | 18.9 | 16 | 15.7 | 15.6 | 15.9 | 18.4 | 17 | 17.1 | 14.3 | 12.3 | 14.3 | 14.8 | 13 | 14.8 | 13.7 | 15 | 15.6 | 14 | 13.3 | 13.4 | 14.9 | 14.3 | 15.2 | 15.3 | 14.2 | 14.1 |
| Apparent mean temperature | 10.6 | 11.2 | 12.8 | 13.6 | 13.2 | 11.2 | 13.2 | 13.6 | 14.9 | 14.3 | 15.2 | 10.4 | 7.8 | 7.1 | 10 | 10.4 | 7.2 | 10.6 | 9 | 9.2 | 13 | 9.8 | 7.1 | 6 | 10.4 | 11.4 | 10.5 | 12.5 | 9 | 8.4 |
| Minimum temperature | 12.1 | 13.1 | 14.3 | 15.1 | 15 | 14.1 | 13.5 | 13.1 | 14.6 | 14.3 | 15.9 | 13.6 | 11.3 | 10.1 | 10.8 | 12.1 | 9.9 | 12.8 | 11.4 | 11.2 | 13.5 | 11.5 | 10.8 | 9.5 | 13.1 | 12.4 | 11.3 | 12.8 | 11.6 | 11.9 |
| Apparent min temperature | 15.2 | 14.9 | 14.1 | 17.5 | 17.8 | 14.8 | 15.9 | 16.6 | 16.5 | 19 | 16.7 | 15.1 | 11.7 | 10.4 | 13.3 | 14 | 10.1 | 13.1 | 10.9 | 13.1 | 14 | 12.9 | 11 | 10.3 | 11.9 | 13.8 | 14.1 | 13.7 | 12.4 | 10.6 |
| 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) | 14.1 | 14 | 13.9 | 13.8 | 13.7 | 13.6 | 13.6 | 13.5 | 13.4 | 13.3 | 13.2 | 13.1 | 13 | 13 | 12.9 | 12.8 | 12.7 | 12.6 | 12.5 | 12.5 | 12.4 | 12.3 | 12.2 | 12.1 | 12 | 11.9 | 11.9 | 11.8 | 11.7 | 11.6 |
| Sunshine duration (h) | 12.7 | 12 | 0 | 12.5 | 12.4 | 10.5 | 11.3 | 8.8 | 4.1 | 11.3 | 0.2 | 9.7 | 11.6 | 4 | 4.1 | 10 | 11.4 | 0 | 7.7 | 4.8 | 0 | 8 | 10.7 | 8.1 | 1.7 | 9 | 9.5 | 5.7 | 5.9 | 10.3 |
| Precipitation (mm) | 0.1 | 0 | 2.9 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 6.6 | 0.9 | 2.1 | 3.7 | 68.5 | 11.1 | 2.7 | 12.3 | 6.4 | 0 | 2.3 | 4.5 | 1.8 | 4.4 | 13.4 | 1.7 | 0 |
| Precipitation hours | 1 | 0 | 8 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 4 | 0 | 0 | 8 | 3 | 3 | 4 | 20 | 9 | 16 | 24 | 7 | 0 | 5 | 16 | 4 | 3 | 8 | 6 | 0 |
| Wind speed (m/s) | 15.4 | 14.4 | 17.3 | 22.2 | 19.7 | 19.2 | 8.9 | 8.3 | 11 | 16.9 | 22.1 | 17.4 | 16.3 | 19.2 | 19.5 | 16.8 | 20.9 | 38.9 | 29.3 | 35 | 35.5 | 18.9 | 18.8 | 29.9 | 34 | 12.7 | 19.6 | 28.2 | 19 | 23.5 |
In September 2023, the highest daytime temperature in Risør was 24.7°C.
While the minimum temperature at night dropped to 9.5°C.
The average nighttime and daytime temperatures during September in Risør are 12.6°C and 18°C respectively.
The precipitation sum in September is about 146 mm.