Average temperature in September is 15.1 °C
Average daytime temperature is 17.8 °C
Average night temperature is 12.5 °C
Absolute maximum temperature: 23.4 °C
Absolute minimum temperature: 9.2 °C
Number of sunny days: 13
Number of rainy days: 17
Number of snow days:
Precipitation sum: 144 mm
* Weather data for Grimstad 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 | 19.5 | 19.4 | 16.3 | 21.8 | 23.4 | 18.7 | 18.3 | 18.9 | 19.1 | 23.1 | 18.9 | 19.3 | 17.1 | 15.8 | 16.6 | 17.3 | 14.9 | 17.1 | 15.1 | 17.6 | 16.4 | 16.3 | 16.5 | 16.3 | 15.7 | 16.6 | 17.8 | 17 | 15.6 | 16.5 |
| Apparent max temperature | 19.1 | 18.9 | 15.7 | 21 | 22.8 | 17 | 18.7 | 20.2 | 19.6 | 23.4 | 18.8 | 16.9 | 14.9 | 13.7 | 15.7 | 17.4 | 11.7 | 16.8 | 14.4 | 14.9 | 15.3 | 14.8 | 13.8 | 13.6 | 13.6 | 15.9 | 16.4 | 15.7 | 14.4 | 12.4 |
| Mean temperature | 16.1 | 16.1 | 14.9 | 17.7 | 17.9 | 16 | 15.9 | 15.9 | 16.1 | 18.2 | 17 | 16.4 | 13.9 | 13.1 | 14.2 | 15 | 13.2 | 15.7 | 12.7 | 15 | 15.2 | 13.6 | 12.7 | 13.1 | 14.9 | 14.5 | 15 | 15.4 | 14 | 13.3 |
| Apparent mean temperature | 10.9 | 11.2 | 10.7 | 12.5 | 12.1 | 11.9 | 13.7 | 13 | 14 | 14 | 15.9 | 10.2 | 7.9 | 7.9 | 11.5 | 10.6 | 7.5 | 12 | 8.6 | 9.9 | 12.5 | 9.6 | 6.5 | 5.9 | 10.8 | 10.8 | 11.9 | 12.8 | 9.4 | 7.6 |
| Minimum temperature | 12.1 | 12.8 | 12.7 | 14.4 | 14.1 | 14.7 | 13.7 | 12.8 | 14.5 | 14.2 | 15.8 | 13.1 | 11.3 | 11 | 11.8 | 12.9 | 10.7 | 14.2 | 10.8 | 10.8 | 12.9 | 11 | 10.2 | 9.2 | 13.6 | 11.6 | 12.1 | 13.9 | 11.7 | 10.9 |
| Apparent min temperature | 15.1 | 14.6 | 13.3 | 16.5 | 16.7 | 14.4 | 16.1 | 16.6 | 16.3 | 18.3 | 17.1 | 14.2 | 11.5 | 11.2 | 13.7 | 14.7 | 9.8 | 14.3 | 10.4 | 13.1 | 13.9 | 12.6 | 10.3 | 10.4 | 12.4 | 13.9 | 13.9 | 13.8 | 12.3 | 9.7 |
| 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 | 14 | 13.9 | 13.8 | 13.7 | 13.6 | 13.5 | 13.5 | 13.4 | 13.3 | 13.2 | 13.1 | 13 | 12.9 | 12.9 | 12.8 | 12.7 | 12.6 | 12.5 | 12.4 | 12.4 | 12.3 | 12.2 | 12.1 | 12 | 11.9 | 11.9 | 11.8 | 11.7 | 11.6 |
| Sunshine duration (h) | 12.7 | 11.1 | 0 | 12.5 | 12.4 | 11.8 | 11.1 | 9.8 | 6.7 | 11.8 | 1.1 | 10.8 | 11.2 | 4 | 3 | 10.2 | 11.3 | 0 | 7.3 | 5.2 | 0 | 8.2 | 10.8 | 6.9 | 1 | 8.9 | 10.2 | 5.8 | 5.4 | 10.1 |
| Precipitation (mm) | 0 | 0 | 3.1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0.6 | 0 | 0 | 3.9 | 2.5 | 0.2 | 3.9 | 47.7 | 14.7 | 7.9 | 19.9 | 6 | 0 | 5.1 | 8.7 | 2.3 | 1.7 | 13.9 | 1.5 | 0 |
| Precipitation hours | 0 | 0 | 10 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 4 | 0 | 0 | 8 | 4 | 2 | 4 | 18 | 18 | 21 | 24 | 7 | 0 | 11 | 16 | 7 | 4 | 11 | 9 | 0 |
| Wind speed (m/s) | 13.9 | 16.8 | 20.9 | 23.2 | 21.1 | 21.4 | 11 | 9.8 | 16.1 | 17.6 | 21.3 | 17.5 | 16.1 | 17.9 | 17.6 | 17.9 | 26.9 | 29.9 | 31.8 | 34.7 | 34.7 | 16.7 | 19.8 | 28.3 | 34.9 | 14.8 | 20.4 | 29.5 | 19.9 | 26 |
In September 2023, the highest daytime temperature in Grimstad was 23.4°C.
While the minimum temperature at night dropped to 9.2°C.
The average nighttime and daytime temperatures during September in Grimstad are 12.5°C and 17.8°C respectively.
The precipitation sum in September is about 144 mm.