April in San Juan averages a daily high of 30.3°C with nights around 22.6°C. Expect roughly 14 wet days totalling 132.7mm. 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. 17 years of April data.