Rio de Janeiro vs Buenos Aires

Rio de Janeiro and Buenos Aires are closely matched in July. 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 25°C. Buenos Aires is cooler at 8°C.

For travelers who prioritize dry weather, Buenos Aires is the stronger choice in July. Rio de Janeiro receives 7 more hours of sunshine per day, which matters for sightseeing and outdoor activities.

Rio de Janeiro reaches an average high of 25°C (77°F) and drops to 17°C (63°F) at night during July. The daily temperature range is 8°C, meaning moderate variation throughout the day.

Buenos Aires averages 8°C (46°F) for the high and 0°C (32°F) for the low, with a daily range of 8°C. There is a notable 17°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 July.

Rio de Janeiro receives approximately 49 mm of rainfall across 7 rain days during July. Rain is occasional, so a light rain jacket should suffice.

Buenos Aires sees 33 mm over 3 rain days. That makes Buenos Aires the drier option by 4 rain days and 16 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.