Sao Paulo vs Rio de Janeiro

Based on sunshine hours, rain days, comfortable temperatures, and humidity levels, Sao Paulo edges ahead as the better destination in September. Sao Paulo offers 9 hours of daily sunshine with only 10 rain days, while Rio de Janeiro sees 9 sunshine hours and 11 rain days.

Sao Paulo sits in the comfortable travel range at 24°C. Rio de Janeiro is also comfortable at 27°C.

For travelers who prioritize dry weather, Sao Paulo is the stronger choice in September.

Sao Paulo reaches an average high of 24°C (75°F) and drops to 15°C (59°F) at night during September. The daily temperature range is 9°C, meaning moderate variation throughout the day.

Rio de Janeiro averages 27°C (81°F) for the high and 19°C (66°F) for the low, with a daily range of 8°C. The 3°C difference is noticeable but not dramatic.

Both cities are in the Southern Hemisphere, so they share the same seasonal pattern in September.

Sao Paulo receives approximately 83 mm of rainfall across 10 rain days during September. You can expect rain roughly every other day.

Rio de Janeiro sees 88 mm over 11 rain days. That makes Sao Paulo the drier option by 1 rain day and 5 mm of total precipitation.

Both cities share similar humidity levels at 78%.