Rio de Janeiro vs Sao Paulo

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.

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

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

Rio de Janeiro reaches an average high of 27°C (81°F) and drops to 19°C (66°F) at night during September. The daily temperature range is 8°C, meaning moderate variation throughout the day.

Sao Paulo averages 24°C (75°F) for the high and 15°C (59°F) for the low, with a daily range of 9°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.

Rio de Janeiro receives approximately 88 mm of rainfall across 11 rain days during September. You can expect rain roughly every other day.

Sao Paulo sees 83 mm over 10 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%.