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 October. Buenos Aires offers 10 hours of daily sunshine with only 10 rain days, while Rio de Janeiro sees 9 sunshine hours and 14 rain days.

Rio de Janeiro sits in the comfortable travel range at 28°C. Buenos Aires is also comfortable at 20°C.

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

Rio de Janeiro reaches an average high of 28°C (82°F) and drops to 20°C (68°F) at night during October. The daily temperature range is 8°C, meaning moderate variation throughout the day.

Buenos Aires averages 20°C (68°F) for the high and 13°C (55°F) for the low, with a daily range of 7°C. There is a notable 8°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 October.

Rio de Janeiro receives approximately 115 mm of rainfall across 14 rain days during October. You can expect rain roughly every other day.

Buenos Aires sees 119 mm over 10 rain days. That makes Buenos Aires the drier option by 4 rain days and 4 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.