Weather will likely play an important role when you plan your trip to Somotillo, and keep in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually April and March with an average temp of 84°F, while the coldest months are December and November with an average of 80°F. The rainiest months in Somotillo are October, June, September, and May, with each month seeing an average of 14 inches of rainfall.