Puerto Rico San Juan Weather in January — Climate Guide
January in San Juan is very-high
January is very-high for 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.
Travel score
Dry season peak + SanSe Festival — best month of year for first-timers
January Weather at a Glance
January averages 82°F / 28°C highs and 70°F / 21°C lows with 8 rainy days and 75mm rainfall. Humidity 76%. UV index 9 (very high). Sunshine 7 hours daily. Sea temperature 26°C ideal for snorkeling. Trade winds 18-22 mph give natural cooling. Sunset 18:00 — golden hour 17:00-17:50 magical for Castillo San Felipe del Morro photography.
January Travel Advice
Reef-safe sunscreen mandatory (oxybenzone + octinoxate banned at most beaches since 2021). Pre-book El Yunque Recreation.gov 1-2 weeks ahead. SanSe Festival mid-January: book hotel 3+ months ahead. Vieques bio bay tour: book moonless nights 2-3 weeks ahead (check lunar calendar).
Flying In from Overseas
Peak winter escape from US East Coast (NYC, Boston, DC), Canada (Toronto, Montreal), UK, Germany. Direct flights from NYC $400-700, Boston $400-650, Toronto $450-750, London via Madrid $700-1,100. Cruise ship season peaks January-March (San Juan is Caribbean's #2 cruise port after Miami). Korean + Japanese inbound minimal (no direct service, $1,800-2,500 via JFK/MIA/DFW).
January Pricing Trends
Year-peak pricing: Condado oceanfront 4-star $350-600/night, 5-star Condado Vanderbilt + La Concha $450-900, Old San Juan boutique El Convento $350-650. Vieques Hix Island House $280-450. SanSe Festival mid-January +30-50% surcharge for Old San Juan hotels.
San Juan January Weather Stats
Avg High
28°C
Avg Low
21°C
Rainy Days
8
75mm total
Sunshine
7h
Daily avg
Humidity
76%
humid
UV Index
9
Very high
Wind
18 km/h
Gusts 32
Sea Temp
26°C
swimming-warm
Crowds
Very busy
At attractions
January Sunrise & Sunset
Air Quality
PM2.5
12 μg/m³
PM10
25 μg/m³
Status
good
Feels-Like Temperature & Wind
Feels like
Daytime
30°C
Nighttime
22°C
Humidity and wind affect how the actual temperature feels.
Wind
18 km/h
Max gust 32 km/h
Activities Recommended for January
January Travel Pros & Cons
Pros
- Dry season peak (best weather)
- SanSe Festival mid-January (canonical PR culture)
- Crystal-clear snorkel visibility
- Three Kings Day Jan 6 cultural depth
Cons
- Year-peak hotel pricing through Jan 6
- SanSe Festival hotels +30-50% mid-month
- Holiday tourist crush early January
January Events & Festivals
- **SanSe Festival (Old San Juan San Sebastián Street Festival, mid-January)** — the canonical PR street party with 4 nights of music + dancing + food vendors on Calle San Sebastián
- Three Kings Day (Jan 6, Día de Reyes — the canonical PR holiday extending Christmas)
- Winter escape peak from US East Coast + Canada
San Juan in January — Full Picture
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.
What to Wear & What to Pack
Tropical perfect — T-shirt, shorts, swimwear, sandals. Light cardigan for evening sea breeze + over-AC restaurants. Reef-safe sunscreen SPF 50+ (oxybenzone-banned at most beaches since 2021).
Packing Checklist
Seasonal Weather Overview
Spring (Mar·Apr·May)
30°C
22°C
7.7/mo
Summer (Jun·Jul·Aug)
32°C
24°C
11.7/mo
Autumn (Sep·Oct·Nov)
31°C
23.3°C
12.3/mo
Winter (Dec·Jan·Feb)
Current28°C
21°C
8.3/mo
San Juan Monthly Weather Comparison
| Month | High | Low | Rain | Sun | Humid | UV | Crowd | Price |
|---|---|---|---|---|---|---|---|---|
| January (Best) | 28° | 21° | 8d·75mm | 7h | 76% | 9 | Very busy | Peak |
| February (Best) | 28° | 21° | 7d·65mm | 8h | 75% | 10 | Very busy | Peak |
| March (Best) | 29° | 21° | 6d·55mm | 8h | 74% | 11 | Very busy | Peak |
| April (Best) | 30° | 22° | 7d·100mm | 8h | 75% | 11 | Busy | Shoulder |
| 31° | 23° | 10d·150mm | 8h | 76% | 12 | Moderate | Shoulder | |
| 32° | 24° | 11d·130mm | 8h | 78% | 12 | Moderate | Shoulder | |
| 32° | 24° | 12d·130mm | 8h | 78% | 12 | Busy | Peak | |
| 32° | 24° | 12d·150mm | 7h | 79% | 11 | Moderate | Shoulder | |
| 32° | 24° | 13d·160mm | 7h | 80% | 10 | Quiet | Low season | |
| 31° | 24° | 13d·165mm | 7h | 80% | 9 | Quiet | Low season | |
| November (Best) | 30° | 22° | 11d·140mm | 7h | 78% | 8 | Moderate | Shoulder |
| December (Best) | 28° | 21° | 10d·110mm | 7h | 77% | 8 | Very busy | Peak |
View Other Months
San Juan January Hotel Picks
Frequently Asked Questions
Is January a good time to visit San Juan?
San Juan in January is very-high. Tourist crowds are very busy and flight/hotel prices are peak.
What's the average temperature in San Juan in January?
San Juan January averages a high of 28°C and a low of 21°C.
Does it rain much in San Juan in January?
San Juan January averages 75mm of rainfall over about 8 rainy days.
What should I wear in San Juan in January?
Tropical perfect — T-shirt, shorts, swimwear, sandals. Light cardigan for evening sea breeze + over-AC restaurants. Reef-safe sunscreen SPF 50+ (oxybenzone-banned at most beaches since 2021).
What time are sunrise and sunset in San Juan in January?
San Juan January sunrise is 06:55 and sunset is 18:00, with 11h 5min of daylight.
What's the air quality like in San Juan in January?
San Juan January air quality (AQI) averages 35, rated Good. PM2.5 averages 12μg/m³.
What activities are recommended in San Juan in January?
In January, San Juan is great for Old San Juan UNESCO walking, El Yunque rainforest hike, Vieques bio bay tour.
Is January peak season in San Juan?
San Juan January crowds are very busy and prices are peak. Advance reservations are strongly recommended.
Best Months to Visit San Juan
View Other Months
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.