January in Arecibo averages a daily high of 26.7°C with nights around 16.7°C. Expect roughly 11.2 wet days totalling 110.3mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Arecibo is December–March.
Based on ARECIBO OBSERVATORY, PR US (14.2km), 1995–2024. 27 years of January data.