Weather is probably a major factor when you plan your trip to Samarinda, and keep in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually October and September with an average temp of 80°F, while the coldest months are July and January with an average of 80°F. The rainiest months in Samarinda are April, March, November, and December, with each month seeing an average of 14 inches of rainfall.