Weather can make or break a roadtrip, so here's some data about year-round temperatures in Eniwetok to help you plan yours: The hottest months are usually September and August with an average temp of 83°F, while the coldest months are February and March with an average of 81°F. The rainiest months in Eniwetok are October, September, August, and November, with each month seeing an average of 10 inches of rainfall.