Average temperature in September is 28.4 °C
Average daytime temperature is 31.2 °C
Average night temperature is 25.8 °C
Absolute maximum temperature: 33 °C
Absolute minimum temperature: 23.9 °C
Number of sunny days: 1
Number of rainy days: 29
Number of snow days:
Precipitation sum: 70 mm
* Weather data for Río Grande Puerto Rico 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 | 31.1 | 31.7 | 30.3 | 31.6 | 31.4 | 30.7 | 30.9 | 30.7 | 31.6 | 31.3 | 31.4 | 31.8 | 33 | 32.7 | 32.6 | 31.6 | 31.3 | 31.3 | 30.5 | 31.3 | 31.4 | 31.6 | 29 | 31.5 | 31.4 | 30.9 | 30.1 | 31.1 | 30.7 | 30.9 |
| Apparent max temperature | 37.3 | 37.3 | 35.6 | 38.1 | 37.1 | 36.1 | 36.2 | 36.3 | 39.1 | 38.4 | 37.8 | 38.7 | 39.6 | 39.6 | 38.8 | 37.5 | 37.3 | 36.7 | 37.1 | 37.1 | 37.3 | 36.3 | 34.4 | 36.9 | 36.9 | 36.7 | 36.7 | 37.9 | 38.3 | 36.9 |
| Mean temperature | 28.7 | 28.8 | 27.7 | 27.8 | 28.4 | 28.3 | 28.5 | 28.5 | 28.4 | 28.3 | 28.1 | 27.5 | 28.9 | 28.4 | 28.9 | 29 | 29.1 | 29 | 28.2 | 27.7 | 28 | 28.5 | 28.1 | 28.9 | 28.6 | 28.8 | 27.7 | 28.1 | 28.4 | 28.4 |
| Apparent mean temperature | 31.3 | 31.2 | 29 | 30.4 | 30.5 | 31 | 30.9 | 30.7 | 31 | 30.3 | 30.6 | 28.2 | 30.5 | 30.1 | 31.7 | 32.1 | 31.9 | 31.2 | 30.7 | 30 | 29.9 | 30.2 | 31.4 | 30.9 | 30.5 | 31.8 | 27.4 | 29.9 | 32.1 | 31.9 |
| Minimum temperature | 25.9 | 26.3 | 24.3 | 25 | 25.5 | 26.1 | 26.6 | 26 | 25.7 | 25.5 | 26.2 | 23.9 | 25.9 | 24.7 | 25.7 | 26.5 | 27.5 | 26.5 | 25.4 | 24.8 | 25.4 | 26.4 | 27.1 | 26.7 | 25.1 | 27.3 | 24.1 | 24.4 | 26.4 | 26.5 |
| Apparent min temperature | 33.9 | 33.9 | 33 | 33.2 | 33.3 | 33.1 | 32.9 | 32.8 | 34.3 | 34 | 33.3 | 32.7 | 34.2 | 34.4 | 34.8 | 34.3 | 33.6 | 33.6 | 33.7 | 33.4 | 32.9 | 32.8 | 32.5 | 33.1 | 33.3 | 33.5 | 32.8 | 33.5 | 34.4 | 33.6 |
| 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) | 12.5 | 12.5 | 12.5 | 12.4 | 12.4 | 12.4 | 12.4 | 12.4 | 12.4 | 12.3 | 12.3 | 12.3 | 12.3 | 12.3 | 12.3 | 12.2 | 12.2 | 12.2 | 12.2 | 12.2 | 12.1 | 12.1 | 12.1 | 12.1 | 12.1 | 12.1 | 12 | 12 | 12 | 12 |
| Sunshine duration (h) | 11.3 | 11.3 | 11.4 | 11.2 | 11.4 | 11.3 | 11.3 | 11.3 | 11.3 | 11.1 | 11.3 | 10.6 | 11.2 | 11.4 | 11.2 | 11.2 | 11.3 | 11.3 | 11.3 | 11.2 | 11 | 11.1 | 9 | 11.1 | 11 | 11.2 | 9.3 | 11.1 | 11.1 | 10.4 |
| Precipitation (mm) | 0.3 | 1.2 | 4.4 | 0.4 | 0 | 2.4 | 1.2 | 1 | 3.6 | 2.6 | 1.5 | 4.9 | 0.8 | 0.6 | 0.5 | 0.1 | 0.7 | 0.5 | 4.3 | 3.4 | 2.9 | 0.9 | 3.5 | 2.9 | 4.2 | 3.7 | 7.7 | 1.3 | 4.5 | 4.1 |
| Precipitation hours | 3 | 3 | 9 | 2 | 0 | 9 | 10 | 6 | 11 | 14 | 7 | 7 | 4 | 2 | 2 | 1 | 4 | 5 | 14 | 6 | 13 | 7 | 11 | 11 | 13 | 12 | 14 | 8 | 18 | 22 |
| Wind speed (m/s) | 15.5 | 17.1 | 14.6 | 14.6 | 15.7 | 16.9 | 16.6 | 15.6 | 12.1 | 12.1 | 13 | 15.6 | 11.6 | 14.2 | 14.6 | 12.4 | 14.4 | 14.1 | 11.6 | 14.9 | 16.5 | 17.1 | 18 | 19.1 | 18 | 16.6 | 17 | 13.7 | 13.5 | 19 |
In September 2023, the highest daytime temperature in Río Grande was 33°C.
While the minimum temperature at night dropped to 23.9°C.
The average nighttime and daytime temperatures during September in Río Grande are 25.8°C and 31.2°C respectively.
The precipitation sum in September is about 70 mm.