Weather is probably a major factor when you plan your trip to Palu, and keep in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually October and May with an average temp of 79°F, while the coldest months are July and August with an average of 79°F. The rainiest months in Palu are June, May, July, and November, with each month seeing an average of 14 inches of rainfall.