San Juan Weather
A month-by-month look at temperature, rainfall and what to pack in San Juan. The annual average is 30°C high / 23°C low — hottest in June (32°C) and coldest in January (21°C).
San Juan Weather at a Glance
As of 2026A quick summary of San Juan's year-round climate and the best time to visit.
- Annual average
- 30° / 23°
- Best time to visit
- January, February, December
- Hottest month
- June (32°C)
- Coldest month
- January (21°C)
- Wettest month
- October (165mm)
- Driest month
- March (55mm)
As of 2026, San Juan's weather averages 30°C high / 23°C low across the year, and the best time to visit for stable temperatures, rainfall and crowds is January, February, December. The hottest month is June (32°C), the coldest is January (21°C), and the wettest is October (165mm).
When is the best time to visit San Juan?
January is San Juan's dry season peak — 28°C highs, 21°C lows, low humidity, crystal-clear Caribbean visibility for snorkeling. The trade-off is year-peak hotel pricing through the first week (Christmas-NYE tail) and the SanSe Festival mid-January (San Sebastián Street Festival, Old San Juan's 4-day street party + 200,000 attendees, hotels +30-50%). Beach conditions excellent: minimal sargassum on San Juan's north-facing coast (Condado, Ocean Park, Isla Verde), water 26°C swimmable, predictable trade winds. El Yunque + Vieques bio bay + Old San Juan walking all at peak conditions. Pre-book everything 4-6 weeks ahead — SanSe Festival hotels sell out 3+ months ahead.
February is statistically San Juan's driest month — only 7 rainy days, 65mm rainfall, consistent 28°C highs, peak Caribbean visibility for snorkeling. Honeymoon + couples pinnacle: Condado Vanderbilt, La Concha Renaissance, Caribe Hilton, El San Juan run Valentine's Day packages with sunset beach dinners + spa couples treatments. Presidents' Day Weekend (3rd Monday) drives US East Coast long-weekend travel — Old San Juan + Condado packed Sat-Mon. Hotel pricing remains at January peaks. Carnaval Ponce mid-February (the PR Mardi Gras + Vejigantes mask tradition) is the cultural side-trip if Day 5+ — drive 1h30 south for parades + caretas masks + traditional bomba music. Hotels +20-30% in Ponce.
December is dry season recovery + year-peak tourist crush. Christmas-New Year week (Dec 22-Jan 5) brings year's maximum hotel pricing (+50-100% above shoulder), peak crowds at every attraction, and the famous Old San Juan NYE Plaza Colón countdown + fireworks party. Weather conditions return to near-peak January quality: 10 rainy days, 110mm rainfall, sea calm and clear, Old San Juan walks at peak. December 1-19 is smart-money window: dry-season weather, pre-Christmas pricing, normal crowds before the holiday crush hits. PR Christmas tradition: Pernil slow-roasted pork shoulder + Pasteles (the labor-intensive Christmas tamale) + Arroz con gandules + Coquito (coconut-rum eggnog) is the canonical Nochebuena (Dec 24) meal. Three Kings Day (Jan 6) prep begins Dec 24 with parrandas (caroling parties).
What is San Juan weather like month by month?
Tap any month for a detailed guide with what to wear, sunrise/sunset and air quality.
| Month | High/Low | Rain | Rainy days | Crowds | |
|---|---|---|---|---|---|
| January | 28° / 21° | 75mm | 8 | Very busy | Details → |
| February | 28° / 21° | 65mm | 7 | Very busy | Details → |
| March | 29° / 21° | 55mm | 6 | Very busy | Details → |
| April | 30° / 22° | 100mm | 7 | Busy | Details → |
| May | 31° / 23° | 150mm | 10 | Moderate | Details → |
| June | 32° / 24° | 130mm | 11 | Moderate | Details → |
| July | 32° / 24° | 130mm | 12 | Busy | Details → |
| August | 32° / 24° | 150mm | 12 | Moderate | Details → |
| September | 32° / 24° | 160mm | 13 | Quiet | Details → |
| October | 31° / 24° | 165mm | 13 | Quiet | Details → |
| November | 30° / 22° | 140mm | 11 | Moderate | Details → |
| December | 28° / 21° | 110mm | 10 | Very busy | Details → |
What should you wear in San Juan?
Hot dry tail — light tropical, hat, SPF 50+. UV index 11 still extreme. Holy Week (early April some years) modest dress for cultural visits.
Hot + very humid summer peak — quick-dry breathable, swimwear, hat, SPF 50+. Mosquito repellent. Light rain jacket. Cooling neck towel for outdoor walks.
Hot tail + wet — quick-dry, light rain jacket, SPF 50+. Mosquito repellent. Sandals for wet beach. Hurricane prep still essential first half.
Same as January — T-shirt, shorts, swimwear, light cardigan for evening. Driest month historical statistically. Reef-safe sunscreen mandatory.
San Juan Weather FAQ
What is the best time to visit San Juan? +
For weather, January, February, December are the most comfortable months. Highs sit around 28°C with relatively stable rainfall and crowds.
What are the hottest and coldest months in San Juan? +
The hottest month is June with an average high of 32°C, and the coldest is January with an average low of 21°C. The annual average is 30°C high / 23°C low.
When does it rain most in San Juan? +
The wettest month is October (165mm over about 13 rainy days) and the driest is March (55mm). Total annual rainfall is roughly 1430mm.
What should I pack for San Juan? +
Spring (Mar–May) averages 30/22°C — Hot dry tail — light tropical, hat, SPF 50+. UV index 11 still extreme. Holy Week (early April some years) modest dress for cultural visits. Summer (Jun–Aug) averages 32/24°C — Hot + very humid summer peak — quick-dry breathable, swimwear, hat, SPF 50+. Mosquito repellent. Light rain jacket. Cooling neck towel for outdoor walks. Autumn (Sep–Nov) averages 31/23°C — Hot tail + wet — quick-dry, light rain jacket, SPF 50+. Mosquito repellent. Sandals for wet beach. Hurricane prep still essential first half. Winter (Dec–Feb) averages 28/21°C — Same as January — T-shirt, shorts, swimwear, light cardigan for evening. Driest month historical statistically. Reef-safe sunscreen mandatory.
What is the weather in San Juan this month (June)? +
June averages 32°C high / 24°C low with 130mm rainfall over about 11 rainy days. Crowds are moderate and prices are moderate.
Keep Planning Your San Juan Trip
Why you can trust weather guide
Based in Chiang Mai for 8+ years, with 30+ countries visited across Southeast Asia, Japan, and Europe. Every detail in this guide is primary-source verified as of April 2026, with prices auto-refreshed via live exchange rate APIs. This isn't AI-generated boilerplate — it's written from the perspective of someone who has actually been there.