Buenos Aires vs Rio de Janeiro

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.

Buenos Aires sits in the comfortable travel range at 25°C. Rio de Janeiro runs hot at 30°C.

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

Buenos Aires reaches an average high of 25°C (77°F) and drops to 18°C (64°F) at night during March. The daily temperature range is 7°C, meaning relatively stable temperatures from day to night.

Rio de Janeiro averages 30°C (86°F) for the high and 23°C (73°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.

Buenos Aires receives approximately 100 mm of rainfall across 8 rain days during March. You can expect rain roughly every other day.

Rio de Janeiro sees 210 mm over 21 rain days. That makes Buenos Aires the drier option by 13 rain days and 110 mm of total precipitation.

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