San Juan Weather in May

San Juan in May averages 31°C (88°F) during the day and 25°C (77°F) at night. May is part of the rainy season, so frequent rainfall is typical.

Rainfall in San Juan in May

As part of the rainy season, San Juan sees around 13 days of rain in May, with an average of 243 mm (9.6 in). With high rainfall totals spread across the month, individual showers can be very heavy. Waterproof gear is strongly recommended.

Temperature in San Juan in May

May in San Juan brings typical temperatures with highs around 31°C (88°F) and lows of 25°C (77°F). Indoor breaks or shaded spots can make the warmer part of the day much more comfortable. Nights are warm at 25°C (77°F). It's worth making sure your accommodation has decent ventilation or air conditioning. Typical temperatures can be misleading; some days will be hotter. Prepare with light clothing and plenty of hydration to stay cool.

If you're looking for dry conditions and comfortable temperatures, May may not be the ideal month to visit San Juan. Our weather planner can help you explore destinations with more pleasant weather conditions.