Casillas, in Santa Rosa Department, Guatemala, is home to roughly 7,700 people in the America/Guatemala time zone at 14.4°N latitude.
In 2025, Casillas recorded an average annual temperature of 71°F. The hottest temperatures reached 93°F in April; the coolest were 54°F in January. Total precipitation for the year was 77 inches, with the wettest month being October.
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