Weather will likely play an important role when you plan your trip to Siruma, and keep in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually May and June with an average temp of 81°F, while the coldest months are February and January with an average of 78°F. The rainiest months in Siruma are July, September, December, and October, with each month seeing an average of 13 inches of rainfall.