Last updated: March 2, 2024
The weather in San Juan, Mexico, during September is characterized by an average temperature of 24°C (75°F). Highs can soar to 31°C (88°F), while lows may dip to 18°C (64°F). Typically, the humidity level in San Juan throughout September hovers around 83%.
Minimum temperature
Average temperature
Maximum temperature
Humidity
In September, San Juan averages 166 mm (6.5 inches) of rainfall, typically over the course of 22 rainy days. The month enjoys an average of 12 hours 14 minutes of daylight, with the sun shining for approximately 8 hours 54 minutes each day. Additionally, there is a 33% probability of sunny days during this period.
Precipitation
Rainy days
Sunshine hours
Chance of sun
In September, the UV Index in San Juan reaches a maximum of 12, indicating a level of Extreme exposure. The most intense UV radiation typically occurs between 13:00 and 15:00, during which unprotected skin may burn in as little as 10 minutes.
| 07:00 | 08:00 | 09:00 | 10:00 | 11:00 | 12:00 | 13:00 | 14:00 | 15:00 | 16:00 | 17:00 | 18:00 | 19:00 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UVI | 1 | 1 | 3 | 6 | 9 | 11 | 12 | 11 | 9 | 5 | 3 | 1 | 1 |
| Exposure | Low | Moderate | High | VeryHigh | Extreme | VeryHigh | Moderate | Low | |||||
| Time to burn | 45 min | 30 min | 25 min | 15 min | 10 min | 15 min | 30 min | 45 min | |||||