With a population of around 2,100, San Agustin sits in Usulutan, El Salvador. The city operates in the America/El Salvador time zone.
In 2025, San Agustin recorded an average annual temperature of 78°F. The hottest temperatures reached 100°F in March; the coolest were 69°F in April. Total precipitation for the year was 80 inches, with the wettest month being June.
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