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 4 hours of daily sunshine with only 4 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 19°C.

For travelers who prioritize dry weather, Sao Paulo is the stronger choice in September. Rio de Janeiro receives 5 more hours of sunshine per day, which matters for sightseeing and outdoor activities.

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 19°C (66°F) for the high and 11°C (52°F) for the low, with a daily range of 8°C. There is a notable 8°C gap between the two cities, so expect a very different feel.

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 50 mm over 4 rain days. That makes Sao Paulo the drier option by 7 rain days and 38 mm of total precipitation.

Humidity also differs: Rio de Janeiro averages 78% while Sao Paulo sits at 75%. Rio de Janeiro will feel muggier, especially at higher temperatures.