Planning for the weather is a good way to make your trip to Luwuk relaxing and enjoyable, especially when you’re splurging. The hottest months are usually October and November with an average temp of 77°F, while the coldest months are September and August with an average of 75°F. The rainiest months in Luwuk are April, May, March, and June, with each month seeing an average of 15 inches of rainfall.