Rio de Janeiro vs Buenos Aires

Rio de Janeiro and Buenos Aires are closely matched in August. Neither city has a clear advantage across all metrics. Your decision should come down to personal preference, cultural interests, and travel logistics rather than weather alone.

Rio de Janeiro sits in the comfortable travel range at 26°C. Buenos Aires is cooler at 11°C.

For travelers who prioritize dry weather, Buenos Aires is the stronger choice in August. Rio de Janeiro receives 6 more hours 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 11°C (52°F) for the high and 3°C (37°F) for the low, with a daily range of 8°C. There is a notable 15°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 40 mm over 3 rain days. That makes Buenos Aires the drier option by 5 rain days and 3 mm of total precipitation.

Humidity also differs: Rio de Janeiro averages 78% while Buenos Aires sits at 65%. Rio de Janeiro will feel muggier, especially at higher temperatures.