Weather is probably a major factor when you plan your trip to Nias, and keep in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually May and March with an average temp of 82°F, while the coldest months are November and October with an average of 81°F. The rainiest months in Nias are November, October, December, and April, with each month seeing an average of 20 inches of rainfall.