If you’re hoping to get lost in the rain on your romantic getaway, check out these details about year-round temperatures in Pleiku: The hottest months are usually March and April with an average temp of 75°F, while the coldest months are January and February with an average of 70°F. The rainiest months in Pleiku are September, July, August, and May, with each month seeing an average of 17 inches of rainfall.