Weather is probably a major factor when you plan your trip to Olivone, and keep in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually July and August with an average temp of 55°F, while the coldest months are January and February with an average of 24°F. The rainiest months in Olivone are August, October, May, and June, with each month seeing an average of 9 inches of rainfall.