Weather is probably a major factor when you plan your trip to Huaraz, and keep in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually August and July with an average temp of 50°F, while the coldest months are July and August with an average of 50°F. The rainiest months in Huaraz are March, January, February, and April, with each month seeing an average of 13 inches of rainfall.