If you’re looking forward to lots of outings with your partner, check out these details about year-round temperatures in Malpais: The hottest months are usually March and February with an average temp of 80°F, while the coldest months are January and December with an average of 79°F. The rainiest months in Malpais are October, August, June, and July, with each month seeing an average of 19 inches of rainfall.