Weather is probably a major factor when you plan your trip to Puerto Sandino, and keep in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually March and April with an average temp of 83°F, while the coldest months are December and January with an average of 81°F. The rainiest months in Puerto Sandino are October, September, June, and May, with each month seeing an average of 16 inches of rainfall.