Last updated: March 2, 2024
The weather in Rio das Ostras, Brazil, during September is characterized by an average temperature of 23°C (74°F). Highs can soar to 34°C (93°F), while lows may dip to 16°C (62°F). Typically, the humidity level in Rio das Ostras throughout September hovers around 75%.
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Average temperature
Maximum temperature
Humidity
In September, Rio das Ostras averages 66 mm (2.6 inches) of rainfall, typically over the course of 8 rainy days. The month enjoys an average of 11 hours 58 minutes of daylight, with the sun shining for approximately 10 hours 12 minutes each day. Additionally, there is a 42% probability of sunny days during this period.
Precipitation
Rainy days
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Chance of sun
In September, the UV Index in Rio das Ostras reaches a maximum of 12, 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 | 2 | 4 | 7 | 10 | 11 | 12 | 10 | 7 | 4 | 2 | 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 | ||||