In terms of precipitation, rainfall in Arequipa ranges from 0.0 - 1.6 inches per month. February is typically the wettest month, when rainfall can reach 1.6 in. April is typically the driest time to visit Arequipa when rainfall is around 0.0 in.
If weather is an important factor for your trip to Arequipa, 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 59.0 F. Travelers looking to avoid the cold should look outside of June, when temperatures are typically at their lowest (around 57.2 F).