Last updated: March 2, 2024
The weather in Rio Branco, Brazil, during September is characterized by an average temperature of 27°C (82°F). Highs can soar to 37°C (99°F), while lows may dip to 19°C (67°F). Typically, the humidity level in Rio Branco throughout September hovers around 33%.
Minimum temperature
Average temperature
Maximum temperature
Humidity
In September, Rio Branco averages 53 mm (2.1 inches) of rainfall, typically over the course of 10 rainy days. The month enjoys an average of 12 hours 2 minutes of daylight, with the sun shining for approximately 9 hours 46 minutes each day. Additionally, there is a 52% probability of sunny days during this period.
Precipitation
Rainy days
Sunshine hours
Chance of sun
In September, the UV Index in Rio Branco reaches a maximum of 12, indicating a level of Extreme exposure. The most intense UV radiation typically occurs between 11:00 and 13:00, 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 | 2 | 4 | 7 | 10 | 12 | 12 | 9 | 6 | 3 | 1 | 1 | 0 | 0 |
| Exposure | Low | Moderate | High | VeryHigh | Extreme | VeryHigh | High | Moderate | Low | ||||
| Time to burn | 45 min | 30 min | 25 min | 15 min | 10 min | 15 min | 25 min | 30 min | 45 min | ||||