Average temperature in September is 28.6 °C
Average daytime temperature is 31.6 °C
Average night temperature is 26.3 °C
Absolute maximum temperature: 34 °C
Absolute minimum temperature: 24.7 °C
Number of sunny days: 4
Number of rainy days: 26
Number of snow days:
Precipitation sum: 65 mm
* Weather data for Castries Saint Lucia 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 | 30.4 | 31.3 | 31.5 | 31.6 | 31.9 | 31.6 | 31.8 | 30.8 | 34 | 33.4 | 33.1 | 32.7 | 32.1 | 32.3 | 32.1 | 32.1 | 31.4 | 32.1 | 31.9 | 30.8 | 30.3 | 31.2 | 31.6 | 30.7 | 31.2 | 30.3 | 29.3 | 31.2 | 32.3 | 30.9 |
| Apparent max temperature | 34 | 35 | 35 | 35.7 | 35.8 | 36.1 | 36.3 | 36.9 | 38.6 | 38 | 37.8 | 36.9 | 37.1 | 37.1 | 37.3 | 37.2 | 37.3 | 37.4 | 36.7 | 35.2 | 34.7 | 35.7 | 36.9 | 35.6 | 35.1 | 35.1 | 35.7 | 38.6 | 37.5 | 37.4 |
| Mean temperature | 28 | 28 | 28.9 | 29 | 29 | 28.4 | 29 | 28 | 29.2 | 29.5 | 29.5 | 29.4 | 29.1 | 28.9 | 29.1 | 29.1 | 28.8 | 29.1 | 28.7 | 27.5 | 27.5 | 28.7 | 28.8 | 28.2 | 28 | 28 | 26.9 | 28.3 | 28.4 | 28.3 |
| Apparent mean temperature | 28.2 | 29.3 | 30 | 29.9 | 29.7 | 28.9 | 30.6 | 30.3 | 30.9 | 30.9 | 30.9 | 30.8 | 31 | 30.3 | 30.1 | 31 | 30.6 | 31.3 | 30.2 | 26.9 | 28.7 | 30.2 | 29.4 | 29.4 | 29.1 | 30.5 | 29.1 | 31.1 | 31.8 | 31.8 |
| Minimum temperature | 25.7 | 26.1 | 26.4 | 27.2 | 26.9 | 25.6 | 26.9 | 26 | 25.8 | 27 | 27.3 | 27 | 27 | 26.4 | 26.6 | 26.4 | 26.6 | 27 | 26.6 | 25 | 25.8 | 27 | 26.1 | 26 | 25.2 | 26.3 | 24.7 | 25.7 | 25.8 | 26.7 |
| Apparent min temperature | 31.2 | 31.1 | 31.6 | 32 | 31.7 | 31.6 | 32.4 | 32.7 | 33.8 | 33.6 | 33.3 | 32.8 | 33.1 | 32.8 | 32.9 | 33.1 | 33.1 | 33.5 | 33 | 31.3 | 31.2 | 32.1 | 32.5 | 31.8 | 31.7 | 31.8 | 31.7 | 34.3 | 33.8 | 33.8 |
| 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) | 12.4 | 12.4 | 12.4 | 12.4 | 12.3 | 12.3 | 12.3 | 12.3 | 12.3 | 12.3 | 12.3 | 12.3 | 12.2 | 12.2 | 12.2 | 12.2 | 12.2 | 12.2 | 12.2 | 12.2 | 12.1 | 12.1 | 12.1 | 12.1 | 12.1 | 12.1 | 12.1 | 12 | 12 | 12 |
| Sunshine duration (h) | 11.1 | 11.7 | 11.7 | 11.7 | 11.5 | 11.6 | 11.6 | 11.6 | 11.6 | 11.6 | 11.6 | 11.6 | 11.5 | 10.9 | 11.3 | 11.5 | 11.5 | 11.5 | 11.5 | 8.9 | 10.3 | 11.4 | 11.4 | 11.2 | 11.4 | 11.1 | 7.3 | 11.2 | 11.3 | 9.4 |
| Precipitation (mm) | 1.5 | 1.3 | 0.1 | 0.1 | 0.4 | 0.6 | 0.5 | 2.7 | 0 | 1.9 | 0.3 | 0 | 4.2 | 0.7 | 0.2 | 0 | 1.1 | 0.8 | 0.6 | 12.2 | 5.1 | 0.8 | 1 | 1.8 | 7.9 | 2.5 | 13.9 | 1.1 | 0 | 1.6 |
| Precipitation hours | 12 | 11 | 1 | 1 | 3 | 6 | 5 | 10 | 0 | 9 | 2 | 0 | 7 | 6 | 2 | 0 | 6 | 4 | 5 | 11 | 7 | 3 | 4 | 11 | 12 | 6 | 10 | 9 | 0 | 9 |
| Wind speed (m/s) | 21.3 | 23.2 | 23.7 | 20.9 | 19.9 | 19.1 | 16.5 | 13 | 12.4 | 15 | 17.2 | 17.2 | 16.2 | 17.3 | 13.7 | 14.3 | 13.4 | 16 | 16.6 | 23 | 21.3 | 17.3 | 20.4 | 22.3 | 23.2 | 15.5 | 15.8 | 8.2 | 19.1 | 15.4 |
In September 2023, the highest daytime temperature in Castries was 34°C.
While the minimum temperature at night dropped to 24.7°C.
The average nighttime and daytime temperatures during September in Castries are 26.3°C and 31.6°C respectively.
The precipitation sum in September is about 65 mm.