Taking into account the local weather in San Antero is an important factor for planning your visit, especially if you plan to spend your trip poolside. The hottest months are usually February and March with an average temp of 82°F, while the coldest months are November and December with an average of 80°F. The rainiest months in San Antero are August, May, July, and June, with each month seeing an average of 11 inches of rainfall.