If you’re hoping to get lost in the rain on your romantic getaway, check out these details about year-round temperatures in Puerto Arista: The hottest months are usually April and March with an average temp of 80°F, while the coldest months are January and February with an average of 76°F. The rainiest months in Puerto Arista are June, September, August, and July, with each month seeing an average of 12 inches of rainfall.