Average temperature in September is 12.6 °C
Average daytime temperature is 14.6 °C
Average night temperature is 10.3 °C
Absolute maximum temperature: 19.9 °C
Absolute minimum temperature: 5 °C
Number of sunny days: 4
Number of rainy days: 26
Number of snow days:
Precipitation sum: 117 mm
* Weather data for Lerwick 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 | 14.1 | 14.9 | 16.1 | 16.3 | 15.5 | 15.7 | 19.4 | 19.9 | 18.7 | 15 | 14.5 | 11.7 | 11.7 | 14.8 | 12.9 | 13.2 | 14.1 | 14.7 | 12.7 | 14.6 | 13.2 | 13.2 | 11.3 | 14.8 | 15.5 | 14.8 | 14.2 | 15.2 | 13.4 | 12 |
| Apparent max temperature | 11.8 | 12.2 | 12.6 | 13.4 | 14.9 | 12.7 | 20.4 | 20.4 | 17.6 | 13.4 | 13.7 | 8.3 | 8.9 | 10.1 | 9.3 | 10.8 | 10.3 | 13.2 | 9.1 | 13.4 | 9.1 | 10.5 | 7 | 12.1 | 11.1 | 10.2 | 11.9 | 12.5 | 9.4 | 9.6 |
| Mean temperature | 12.2 | 12.2 | 14.5 | 14.9 | 13.3 | 13.7 | 16 | 16.4 | 14.8 | 12.9 | 12.9 | 10 | 8.9 | 12.3 | 11.5 | 10.6 | 11.2 | 13.4 | 11.1 | 12.3 | 12.2 | 11.5 | 9.5 | 12.7 | 14.2 | 13.4 | 12.3 | 13.6 | 12.3 | 11 |
| Apparent mean temperature | 7.5 | 5.4 | 10.6 | 10.2 | 9.1 | 9 | 11.9 | 12.5 | 11.1 | 8.3 | 7.6 | 4.6 | 1.7 | 4.2 | 5.3 | 5.4 | 4.5 | 5.7 | 5.5 | 6.5 | 5.6 | 5.2 | 4 | 6 | 7.6 | 8.5 | 8.1 | 7.7 | 6.2 | 6.5 |
| Minimum temperature | 9.3 | 7.7 | 13.7 | 13.5 | 10.8 | 10.8 | 13.2 | 13.2 | 12.7 | 9.7 | 10.8 | 7.3 | 5 | 10.5 | 9.9 | 7.5 | 6.9 | 11.1 | 10 | 9.9 | 11.5 | 9.9 | 7.3 | 9 | 13 | 11.8 | 10.9 | 12.5 | 11.2 | 8.7 |
| Apparent min temperature | 10.2 | 10 | 11.9 | 12 | 11.9 | 11.2 | 15.4 | 16.1 | 13.3 | 11.8 | 11.2 | 6.6 | 5.9 | 6.6 | 7.4 | 8.5 | 8.3 | 11 | 7.5 | 9.5 | 7.3 | 7.9 | 5.6 | 9.1 | 9.5 | 9.4 | 9.5 | 10.3 | 7.9 | 7.7 |
| 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) | 14.2 | 14.1 | 14 | 13.9 | 13.8 | 13.7 | 13.6 | 13.6 | 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 | 11.7 | 11.7 | 11.6 |
| Sunshine duration (h) | 12.4 | 4.2 | 0 | 1 | 12.2 | 2.8 | 11.2 | 12 | 2.3 | 6 | 6 | 11.5 | 10.9 | 7.8 | 5.9 | 11.5 | 10.2 | 0 | 11.2 | 0.4 | 6.5 | 7.5 | 10.4 | 2.2 | 8.3 | 8 | 8.1 | 5.1 | 10.1 | 6.6 |
| Precipitation (mm) | 0 | 4.1 | 11.3 | 5.9 | 0.4 | 0.1 | 0 | 0 | 3 | 6.9 | 9.7 | 1.3 | 0 | 8 | 0.3 | 0.3 | 3.1 | 14.9 | 1.2 | 10 | 2.8 | 2.4 | 0.2 | 8.4 | 1 | 2.9 | 2.2 | 10.5 | 6.3 | 0.1 |
| Precipitation hours | 0 | 7 | 13 | 14 | 3 | 1 | 0 | 0 | 4 | 9 | 12 | 6 | 0 | 12 | 3 | 3 | 7 | 21 | 8 | 17 | 14 | 14 | 2 | 12 | 1 | 3 | 7 | 11 | 9 | 1 |
| Wind speed (m/s) | 15.8 | 29.8 | 41 | 35.9 | 26.2 | 29.7 | 23.9 | 17.4 | 25.1 | 14 | 21 | 23.7 | 17.1 | 43.5 | 38.4 | 13.8 | 28.3 | 40.2 | 35 | 31 | 41.1 | 31.1 | 28.4 | 44.4 | 47.2 | 38.2 | 32.1 | 36.6 | 36.8 | 32.2 |
In September 2023, the highest daytime temperature in Lerwick was 19.9°C.
While the minimum temperature at night dropped to 5°C.
The average nighttime and daytime temperatures during September in Lerwick are 10.3°C and 14.6°C respectively.
The precipitation sum in September is about 117 mm.