Last updated: March 2, 2024
The weather in San Juan, Peru, during September is characterized by an average temperature of 12°C (54°F). Highs can soar to 21°C (70°F), while lows may dip to 6°C (42°F). Typically, the humidity level in San Juan throughout September hovers around 42%.
Minimum temperature
Average temperature
Maximum temperature
Humidity
In September, San Juan averages 154 mm (6.1 inches) of rainfall, typically over the course of 18 rainy days. The month enjoys an average of 12 hours 3 minutes of daylight, with the sun shining for approximately 10 hours 21 minutes each day. Additionally, there is a 39% 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 17, indicating a level of Extreme exposure. The most intense UV radiation typically occurs between 12:00 and 14:00, 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 | 3 | 7 | 12 | 15 | 17 | 16 | 12 | 8 | 3 | 1 | 1 | 0 |
| Exposure | Low | Moderate | High | Extreme | VeryHigh | Moderate | Low | ||||||
| Time to burn | 45 min | 30 min | 25 min | 10 min | 15 min | 30 min | 45 min | ||||||