You can plan your beach trip with this snapshot of weather throughout the year in Pisco: The hottest months are usually February and March with an average temp of 73°F, while the coldest months are August and September with an average of 63°F. From January through March, the daytime average is 78°F and the nighttime average is 69°F. Between April and June, temperatures average 74°F during the day and 62°F at night. July through September averages 67°F during the day and 59°F at night. In October-December, the average temperature is 73°F during the day and 61°F at night.