Weather will likely play an important role when you plan your trip to El Salvador, and keep in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually February and January with an average temp of 67°F, while the coldest months are July and August with an average of 58°F. From January through March, the daytime average is 76°F and the nighttime average is 61°F. Between April and June, temperatures average 72°F during the day and 52°F at night. July through September averages 68°F during the day and 50°F at night. In October-December, the average temperature is 73°F during the day and 53°F at night.