May in Caguas averages a daily high of 31.3°C with nights around 22.2°C. Expect roughly 12.5 wet days totalling 173.6mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Caguas is December–April.
Based on TRUJILLO ALTO 2 SSW, PR US (11km), 1995–2024. 27 years of May data.