March in San Juan averages a daily high of 29.6°C with nights around 21.6°C. Expect roughly 13.4 wet days totalling 95mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit San Juan is November–April.
Based on TOA BAJA LEVITTOWN, PR US (7.4km), 1995–2024. 19 years of March data.