In terms of precipitation, rainfall in Iquitos ranges from 6.3 - 11.8 inches per month. April is typically the wettest month, when rainfall can reach 11.8 in. July is typically the driest time to visit Iquitos when rainfall is around 6.3 in.
If weather is an important factor for your trip to Iquitos, use this chart to help with planning. For those seeking warmer temperatures, January is the ideal time of year to visit, when temperatures reach an average of 80.6 F. Travelers looking to avoid the cold should look outside of July, when temperatures are typically at their lowest (around 77.0 F).