If you’re looking forward to lots of outings with your partner, check out these details about year-round temperatures in Oeseo: The hottest months are usually August and July with an average temp of 71°F, while the coldest months are January and December with an average of 29°F. The rainiest months in Oeseo are July, August, June, and September, with each month seeing an average of 10 inches of rainfall.