Rio de Janeiro weather in September
September in Rio de Janeiro: hot, rainy — one of the best months to visit.
#1 of 12 months in Rio de Janeiro · #206 of 604 destinations to visit in September · comfort 85/100 (tier A)
Updated June 2026 · climate normals from ERA5 reanalysis
Rio de Janeiro climate normals — September
| Daytime high | 28°C / 83°F | 🥵 hot |
|---|---|---|
| Nighttime low | 20°C / 67°F | |
| Feels like (high) | 31°C / 88°F | |
| Rainfall | 84 mm / 3.3 in | 🌧 rainy |
| Rainy days | 10 days | |
| Humidity | 75% | 💧 humid |
| Dew point | 17°C / 63°F | |
| Sunshine | 8.8 h/day | |
| Daylight | 12 h | |
| Wind | 12 km/h / 8 mph | |
| Air quality (US AQI) | 70 | 🙂 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 September — FAQ
- Is September a good time to visit Rio de Janeiro?
- September in Rio de Janeiro: hot, rainy — one of the best months to visit. It ranks #1 of 12 months for Rio de Janeiro on SeasonMap's comfort score (85/100).
- What is the weather like in Rio de Janeiro in September?
- In September, Rio de Janeiro averages a daily high of 28.3°C and a low of 19.5°C, with about 83.5 mm of rain over roughly 9.8 rainy days.
- What is the air quality in Rio de Janeiro in September?
- Rio de Janeiro has a mean US Air Quality Index of about 70 in September.