Last updated: March 2, 2024
The weather in Rio de Janeiro, Brazil, during December is characterized by an average temperature of 25°C (78°F). Highs can soar to 33°C (91°F), while lows may dip to 20°C (68°F). Typically, the humidity level in Rio de Janeiro throughout December hovers around 75%.
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Average temperature
Maximum temperature
Humidity
In December, Rio de Janeiro averages 143 mm (5.6 inches) of rainfall, typically over the course of 17 rainy days. The month enjoys an average of 13 hours 30 minutes of daylight, with the sun shining for approximately 10 hours 16 minutes each day. Additionally, there is a 41% probability of sunny days during this period.
Precipitation
Rainy days
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Chance of sun
In December, the UV Index in Rio de Janeiro reaches a maximum of 15, 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 | 5 | 9 | 12 | 15 | 15 | 13 | 10 | 6 | 3 | 1 | 1 | 0 |
| Exposure | Low | Moderate | VeryHigh | Extreme | VeryHigh | High | Moderate | Low | |||||
| Time to burn | 45 min | 30 min | 15 min | 10 min | 15 min | 25 min | 30 min | 45 min | |||||