If you’re hoping to get lost in the rain on your romantic getaway, check out these details about year-round temperatures in Puerto Cárdenas: The hottest months are usually February and January with an average temp of 55°F, while the coldest months are July and August with an average of 42°F. The rainiest months in Puerto Cárdenas are August, June, May, and July, with each month seeing an average of 24 inches of rainfall.