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 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.

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

Buenos Aires reaches an average high of 20°C (68°F) and drops to 13°C (55°F) at night during October. The daily temperature range is 7°C, meaning relatively stable temperatures from day to night.

Rio de Janeiro averages 28°C (82°F) for the high and 20°C (68°F) for the low, with a daily range of 8°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.

Buenos Aires receives approximately 119 mm of rainfall across 10 rain days during October. You can expect rain roughly every other day.

Rio de Janeiro sees 115 mm over 14 rain days. That makes Buenos Aires the drier option by 4 rain days and 4 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.