If you’re looking forward to lots of outings with your partner, check out these details about year-round temperatures in Jaramillo: The hottest months are usually April and March with an average temp of 71°F, while the coldest months are January and February with an average of 70°F. The rainiest months in Jaramillo are October, August, November, and May, with each month seeing an average of 24 inches of rainfall.