throughout october, the most common forms of precipitation are drizzle, light to moderate rain, and occasional brief thunderstorms - the relative humidity typically ranges from a mildly humid 57% to a very humid 96%, rarely dropping below a comfortable 38% and reaching as high as 100%. 

Fully into spring time, Rio de Janeiro becomes irresistible. It's a wonderful time to explore the full and rich natural side of this city - With its rising temperatures, evolving slowly into the 30° celsius (95° fahrenheit) and 45% chance of cloudy days, October welcomes the rainforest weather and all its characteristics.