March in Arecibo averages a daily high of 27.8°C with nights around 16.6°C. Expect roughly 12.2 wet days totalling 139.4mm. Generally workable, with some weather to plan around.
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 March data.