San Martin, in Cuscatlan, El Salvador, is home to roughly 39,400 people in the America/El Salvador time zone at 13.8°N latitude.
In 2025, San Martin recorded an average annual temperature of 77°F. The hottest temperatures reached 100°F in April; the coolest were 63°F in January. Total precipitation for the year was 54 inches, with the wettest month being June.
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