July in Arecibo averages a daily high of 30.7°C with nights around 20.3°C. Expect roughly 15.5 wet days totalling 179.4mm. 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. 26 years of July data.