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 December. Sao Paulo offers 7 hours of daily sunshine with only 6 rain days, while Rio de Janeiro sees 10 sunshine hours and 20 rain days.

Rio de Janeiro can feel quite hot at 30°C, so plan for heat. Sao Paulo is also comfortable at 26°C.

For travelers who prioritize dry weather, Sao Paulo is the stronger choice in December. Rio de Janeiro receives 3 more hours of sunshine per day, which matters for sightseeing and outdoor activities.

Rio de Janeiro reaches an average high of 30°C (86°F) and drops to 23°C (73°F) at night during December. The daily temperature range is 7°C, meaning relatively stable temperatures from day to night.

Sao Paulo averages 26°C (79°F) for the high and 18°C (64°F) for the low, with a daily range of 8°C. The 4°C difference is noticeable but not dramatic.

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

Rio de Janeiro receives approximately 226 mm of rainfall across 20 rain days during December. Rain is frequent, so waterproof gear is essential.

Sao Paulo sees 70 mm over 6 rain days. That makes Sao Paulo the drier option by 14 rain days and 156 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.