San Juan in August
In August, San Juan averages 32°C (90°F) during the day and 25°C (77°F) at night, with frequent rain — about 16 days of the month see precipitation (165 mm total).
ShoulderConditions are warm and beach-friendly. Expect daily rain or showers, often in heavy bursts.
It's peak hurricane season in San Juan during August. Travel is possible but expect storm risk, possible flight disruption, and generally lower travel insurance coverage.
How August compares to the rest of the year in San Juan
August is one of the warmest months in San Juan (1st of 12) and one of the wettest months (2nd of 12). Daytime temperature runs 2°C above the annual average (30°C). August runs 1°C warmer than July (31°C) and cools 1°C in September (31°C).
August sunrise & sunset in San Juan
Times shown for San Juan local time (America/Puerto_Rico), calculated for the 15th of August. They shift by a few minutes day to day across the month.
Photography light in San Juan — August
Golden-hour and blue-hour windows for the 15th of August, in San Juan's local time. Use these for soft warm light (golden) or cool architectural twilight (blue).
📅 When to book — San Juan in August
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 August's tier (Shoulder) and San Juan's popularity.
Crowds & pricing — August 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.
Why this tier: Northern Hemisphere summer holidays peak hazard season (1 active)
Sun & mosquito risk — August 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 — August
Across the year San Juan's sea swings from 26.5°C (February) to 30.4°C (October) — August sits at 29.7°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 August weather
🌍 See the full ranked list of climate twins for San Juan in August →
Frequently asked questions
How hot is San Juan in August?
In August, San Juan averages a high of 32°C (90°F) and a low of 25°C (77°F) — generally hot.
Does it rain a lot in San Juan in August?
August is quite rainy in San Juan, with about 16 rainy days on average.
Is August a good time to visit San Juan?
August 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 August?
Pack lightweight, breathable clothing, sunglasses and sunscreen, plus a compact umbrella or rain jacket. See the full August packing list for San Juan for a complete, climate-based checklist.
Check the live 10-day forecast and sunrise/sunset.