...and more
In terms of precipitation, rainfall in Arusha ranges from 0.4 - 14.2 inches per month. April is typically the wettest month, when rainfall can reach 14.2 in. July is typically the driest time to visit Arusha when rainfall is around 0.4 in.
If weather is an important factor for your trip to Arusha, 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 66.2 F. Travelers looking to avoid the cold should look outside of June, when temperatures are typically at their lowest (around 57.2 F).