Average temperature in September is 13.4 °C
Average daytime temperature is 15.5 °C
Average night temperature is 11.3 °C
Absolute maximum temperature: 22.5 °C
Absolute minimum temperature: 8.4 °C
Number of sunny days: 5
Number of rainy days: 25
Number of snow days:
Precipitation sum: 175 mm
* Weather data for Stornoway United Kingdom 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 | 17.2 | 16.4 | 17.5 | 17.5 | 17.7 | 19.8 | 22.5 | 22.3 | 18.5 | 14.9 | 14.2 | 13.3 | 13.9 | 14.1 | 13.4 | 13.1 | 13.9 | 13.8 | 13.5 | 16 | 13.4 | 11.8 | 12.2 | 15.3 | 15 | 15.3 | 13.8 | 15.2 | 14.5 | 13.8 |
| Apparent max temperature | 16.5 | 13.8 | 14.9 | 14.9 | 18.4 | 18.3 | 22.5 | 23.2 | 16.4 | 14.5 | 13.9 | 11 | 10.1 | 8.7 | 12.1 | 11.1 | 11.7 | 12.9 | 9.9 | 14.4 | 11.5 | 8.4 | 9.2 | 12.8 | 10.6 | 13.6 | 10.6 | 12.5 | 9.2 | 11.6 |
| Mean temperature | 14.3 | 14.4 | 16 | 15.6 | 15.7 | 16.3 | 18.8 | 18.5 | 15.7 | 13.2 | 12.9 | 11.3 | 11.6 | 12.9 | 11.2 | 11 | 12.3 | 11.9 | 11.2 | 12.5 | 11.7 | 10.6 | 10.7 | 13.8 | 13.9 | 13.5 | 12.2 | 13.3 | 12.3 | 11.9 |
| Apparent mean temperature | 10.7 | 9.9 | 11.9 | 11 | 13.6 | 13 | 15.9 | 15.3 | 10.8 | 10 | 8.3 | 7.4 | 5.6 | 6 | 7.4 | 6.8 | 7.9 | 5.6 | 5.2 | 7 | 7.4 | 5.7 | 5.9 | 7.8 | 7.6 | 8.1 | 7.4 | 7.7 | 6.9 | 7.5 |
| Minimum temperature | 11.7 | 11 | 14.8 | 14.4 | 14.4 | 13.3 | 16.2 | 15.7 | 11.8 | 11.1 | 11.1 | 9.5 | 9.9 | 11.3 | 9.5 | 9.2 | 10.3 | 8.9 | 9.1 | 10 | 10.8 | 9.3 | 8.4 | 12.1 | 13 | 10.9 | 10.7 | 12.1 | 10.8 | 8.9 |
| Apparent min temperature | 13.6 | 12.3 | 13.6 | 13.1 | 15.5 | 15.6 | 18.4 | 18.7 | 14.4 | 12.7 | 10.6 | 9.1 | 8.2 | 7.8 | 9.2 | 9 | 10 | 9.6 | 7.5 | 10.3 | 9 | 6.9 | 7.3 | 11 | 9 | 10.1 | 8.8 | 9.9 | 7.7 | 9.8 |
| 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 | 13.9 | 13.9 | 13.8 | 13.7 | 13.6 | 13.5 | 13.4 | 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 | 2 | 1 | 2 | 8.6 | 11.7 | 11.6 | 12.1 | 1.6 | 0 | 11.3 | 11.7 | 5.2 | 11.3 | 11.1 | 11.1 | 6.3 | 5.2 | 9.4 | 6.4 | 3 | 6.4 | 8.9 | 1.6 | 9 | 2.2 | 3 | 5.6 | 10.2 | 10.1 |
| Precipitation (mm) | 0 | 1.5 | 9.3 | 0.2 | 0 | 0.1 | 0 | 0 | 2.5 | 12.2 | 2.7 | 1.1 | 15.7 | 4.5 | 0.2 | 0.5 | 6.7 | 18.5 | 1.4 | 11.5 | 8 | 3.9 | 0 | 30.8 | 8.3 | 10.2 | 11.3 | 8 | 3.4 | 2.8 |
| Precipitation hours | 0 | 6 | 22 | 2 | 0 | 1 | 0 | 0 | 10 | 13 | 8 | 7 | 12 | 9 | 2 | 5 | 9 | 13 | 7 | 22 | 15 | 9 | 0 | 22 | 18 | 10 | 10 | 16 | 16 | 9 |
| Wind speed (m/s) | 11.5 | 29.8 | 33.2 | 31.7 | 16.7 | 23.6 | 26.3 | 17.9 | 26.1 | 11.7 | 22 | 15.1 | 35 | 47.3 | 15.6 | 10.9 | 23.6 | 20.5 | 31.4 | 23.1 | 26.7 | 26.9 | 24 | 33.5 | 39.7 | 37.4 | 36.3 | 37.4 | 35.7 | 24.3 |
In September 2023, the highest daytime temperature in Stornoway was 22.5°C.
While the minimum temperature at night dropped to 8.4°C.
The average nighttime and daytime temperatures during September in Stornoway are 11.3°C and 15.5°C respectively.
The precipitation sum in September is about 175 mm.