San Juan in May
In May, San Juan averages 30°C (86°F) during the day and 24°C (75°F) at night, with frequent rain — about 14 days of the month see precipitation (155 mm total).
ShoulderConditions are warm and beach-friendly. Plan for unsettled weather and bring rain gear.
May offers comfortable temperatures in San Juan, with some rain to plan around.
How May compares to the rest of the year in San Juan
May is in the middle of the year for warmth in San Juan (6th of 12) and moderately rainy compared to the rest of the year (4th of 12). Daytime temperature matches the city's annual average. May runs 1°C warmer than April (29°C) and warms a further 1°C into June (31°C).
May sunrise & sunset in San Juan
Times shown for San Juan local time (America/Puerto_Rico), calculated for the 15th of May. They shift by a few minutes day to day across the month.
Photography light in San Juan — May
Golden-hour and blue-hour windows for the 15th of May, in San Juan's local time. Use these for soft warm light (golden) or cool architectural twilight (blue).
📅 When to book — San Juan in May
Travel writers usually only tell you when to go. Here's when to book flights and lodging for the best mix of price and availability, based on May's tier (Shoulder) and San Juan's popularity.
Crowds & pricing — May in San Juan
San Juan is in a shoulder season month — fewer crowds, slightly lower prices, and a calmer atmosphere than peak weeks. Most major sights stay open with normal hours, though a handful of seasonal restaurants or boat trips may run reduced schedules. Many regulars consider these months the best time to visit because you trade a small amount of weather reliability for a much more pleasant on-the-ground experience.
Sun & mosquito risk — May in San Juan
UV is a clear-sky sea-level estimate — clouds, altitude, and reflective surfaces (snow, water) shift it ±30%. Mosquito risk is climate-derived only; for current disease advisories (dengue, malaria, zika) check the CDC or WHO travel pages before your trip.
Sea temperature in San Juan — May
Across the year San Juan's sea swings from 26.5°C (February) to 30.4°C (October) — May sits at 28.5°C.
San Juan in other months
| Month | Avg high | Avg low | Rainfall | Rain days | Snow days |
|---|---|---|---|---|---|
| January | 28°C / 82°F | 21°C / 70°F | 75 mm | 11 | — |
| February | 28°C / 82°F | 21°C / 70°F | 55 mm | 9 | — |
| March | 29°C / 84°F | 22°C / 72°F | 55 mm | 9 | — |
| April | 29°C / 84°F | 23°C / 73°F | 110 mm | 11 | — |
| May | 30°C / 86°F | 24°C / 75°F | 155 mm | 14 | — |
| June | 31°C / 88°F | 25°C / 77°F | 130 mm | 14 | — |
| July | 31°C / 88°F | 25°C / 77°F | 150 mm | 16 | — |
| August | 32°C / 90°F | 25°C / 77°F | 165 mm | 16 | — |
| September | 31°C / 88°F | 25°C / 77°F | 145 mm | 15 | — |
| October | 31°C / 88°F | 24°C / 75°F | 130 mm | 13 | — |
| November | 30°C / 86°F | 23°C / 73°F | 140 mm | 13 | — |
| December | 29°C / 84°F | 22°C / 72°F | 110 mm | 12 | — |
Other cities with similar May weather
🌍 See the full ranked list of climate twins for San Juan in May →
Frequently asked questions
How hot is San Juan in May?
In May, San Juan averages a high of 30°C (86°F) and a low of 24°C (75°F) — generally hot.
Does it rain a lot in San Juan in May?
May can be fairly wet in San Juan, with about 14 rainy days on average.
Is May a good time to visit San Juan?
May is hot but on the rainy side. It suits travelers who are comfortable with hot weather; check the month-by-month ranking to compare it against the rest of the year.
What should I pack for San Juan in May?
Pack lightweight, breathable clothing, sunglasses and sunscreen, plus a compact umbrella or rain jacket. See the full May packing list for San Juan for a complete, climate-based checklist.
Check the live 10-day forecast and sunrise/sunset.