Weather is only one factor, but it can really affect your travel plans, especially when you're planning an extended stay in El Salvador. 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.