São Paulo weather in September
September in São Paulo: warm, a little rain, with poor air quality — an excellent time to visit.
#5 of 12 months in São Paulo · #252 of 604 destinations to visit in September · comfort 83/100 (tier A)
Updated June 2026 · climate normals from ERA5 reanalysis
São Paulo climate normals — September
| Daytime high | 26°C / 79°F | 🌤 warm |
|---|---|---|
| Nighttime low | 16°C / 60°F | |
| Feels like (high) | 27°C / 81°F | |
| Rainfall | 53 mm / 2.1 in | 🌦 some rain |
| Rainy days | 8 days | |
| Humidity | 76% | 💦 very humid |
| Dew point | 14°C / 58°F | |
| Sunshine | 9.1 h/day | |
| Daylight | 12 h | |
| Wind | 18 km/h / 11 mph | |
| Air quality (US AQI) | 104 | 😷 poor |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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São Paulo in September — FAQ
- Is September a good time to visit São Paulo?
- September in São Paulo: warm, a little rain, with poor air quality — an excellent time to visit. It ranks #5 of 12 months for São Paulo on SeasonMap's comfort score (83/100).
- What is the weather like in São Paulo in September?
- In September, São Paulo averages a daily high of 26.3°C and a low of 15.5°C, with about 52.9 mm of rain over roughly 7.8 rainy days.
- What is the air quality in São Paulo in September?
- São Paulo has a mean US Air Quality Index of about 104 in September.