Bartolo, in Rio Grande, Puerto Rico, is home to roughly 1,300 people in the America/Puerto Rico time zone at 18.4°N latitude.
In 2025, Bartolo recorded an average annual temperature of 78°F. The hottest temperatures reached 90°F in September; the coolest were 67°F in December. Total precipitation for the year was 50 inches, with the wettest month being April.
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