Taking into account the local weather in Montero is an important factor for planning your visit, especially if you plan to spend your trip poolside. The hottest months are usually October and September with an average temp of 79°F, while the coldest months are July and June with an average of 71°F. The rainiest months in Montero are December, January, February, and November, with each month seeing an average of 9 inches of rainfall.