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 August. Buenos Aires offers 8 hours of daily sunshine with only 7 rain days, while Rio de Janeiro sees 9 sunshine hours and 8 rain days.

Rio de Janeiro sits in the comfortable travel range at 26°C. Buenos Aires is also comfortable at 16°C.

For travelers who prioritize dry weather, Buenos Aires is the stronger choice in August. Rio de Janeiro receives 1 more hour of sunshine per day, which matters for sightseeing and outdoor activities.

Rio de Janeiro reaches an average high of 26°C (79°F) and drops to 18°C (64°F) at night during August. The daily temperature range is 8°C, meaning moderate variation throughout the day.

Buenos Aires averages 16°C (61°F) for the high and 9°C (48°F) for the low, with a daily range of 7°C. There is a notable 10°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 August.

Rio de Janeiro receives approximately 43 mm of rainfall across 8 rain days during August. You can expect rain roughly every other day.

Buenos Aires sees 72 mm over 7 rain days. That makes Buenos Aires the drier option by 1 rain day and 29 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.