Rio de Janeiro vs Buenos Aires

Based on sunshine hours, rain days, comfortable temperatures, and humidity levels, Buenos Aires edges ahead as the better destination in March. Buenos Aires offers 10 hours of daily sunshine with only 8 rain days, while Rio de Janeiro sees 10 sunshine hours and 21 rain days.

Rio de Janeiro can feel quite hot at 30°C, so plan for heat. Buenos Aires is also comfortable at 25°C.

For travelers who prioritize dry weather, Buenos Aires is the stronger choice in March.

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

Buenos Aires averages 25°C (77°F) for the high and 18°C (64°F) for the low, with a daily range of 7°C. There is a notable 5°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 March.

Rio de Janeiro receives approximately 210 mm of rainfall across 21 rain days during March. Rain is frequent, so waterproof gear is essential.

Buenos Aires sees 100 mm over 8 rain days. That makes Buenos Aires the drier option by 13 rain days and 110 mm of total precipitation.

Humidity also differs: Rio de Janeiro averages 78% while Buenos Aires sits at 70%. Rio de Janeiro will feel muggier, especially at higher temperatures.