Rio de Janeiro weather in December
December in Rio de Janeiro: sweltering, soaked, with very humid — a great time to visit.
#11 of 12 months in Rio de Janeiro · #234 of 604 destinations to visit in December · comfort 75/100 (tier B)
Updated June 2026 · climate normals from ERA5 reanalysis
Rio de Janeiro climate normals — December
| Daytime high | 29°C / 85°F | 🔥 sweltering |
|---|---|---|
| Nighttime low | 23°C / 73°F | |
| Feels like (high) | 34°C / 93°F | |
| Rainfall | 252 mm / 9.9 in | ⛈ soaked |
| Rainy days | 22 days | |
| Humidity | 77% | 💦 very humid |
| Dew point | 21°C / 70°F | |
| Sunshine | 9.4 h/day | |
| Daylight | 13.5 h | |
| Wind | 11 km/h / 7 mph | |
| Air quality (US AQI) | 78 | 🙂 moderate |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Rio de Janeiro in December — FAQ
- Is December a good time to visit Rio de Janeiro?
- December in Rio de Janeiro: sweltering, soaked, with very humid — a great time to visit. It ranks #11 of 12 months for Rio de Janeiro on SeasonMap's comfort score (75/100).
- What is the weather like in Rio de Janeiro in December?
- In December, Rio de Janeiro averages a daily high of 29.4°C and a low of 22.5°C, with about 251.8 mm of rain over roughly 21.8 rainy days.
- What is the air quality in Rio de Janeiro in December?
- Rio de Janeiro has a mean US Air Quality Index of about 78 in December.