Good weather’s definitely a plus when you’re experiencing new places, so here’s some information that might be helpful: The hottest months are usually May and June with an average temp of 78°F, while the coldest months are January and September with an average of 76°F. The rainiest months in Seberut Barat Daya are November, April, October, and May, with each month seeing an average of 18 inches of rainfall.