Weather will likely play an important role when you plan your trip to Ambo, and keep in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually March and February with an average temp of 65°F, while the coldest months are October and December with an average of 61°F. The rainiest months in Ambo are July, August, June, and September, with each month seeing an average of 9 inches of rainfall.