December 16 is generally a great time to visit San Juan. While there is a slight chance of rain (24%), showers are usually brief. Expect comfortable 28°C weather. You'll find plenty of company in San Juan this month as tourism activity remains quite robust.
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Essential Travel Info for San Juan
Currency
USD
$ United States dollar
Language
English
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Driving
Right side
San Juan Weather Forecast for December 16
"Warm & Sunny. Expect average highs of 28.1°C. 24% chance of rain."
What to Wear in San Juan in December
Based on historical data for December 16, San Juan typically experiences temperatures between 22.5°C and 28.1°C. We recommend packing t-shirt, light clothing to stay comfortable. Trends suggest it will stay mostly dry (24% rain probability), but checking the forecast before heading out is always wise.
Complete Packing Guide
Weekly breakdown & essential items for San Juan
Smart Suitcase
- T-Shirt
- Light Clothing
Average High
28.1°C
Daytime Peak
Average Low
22.5°C
Nighttime Low
Feels Like
32.5°C
🔥 Feels warmer
Rain Chance
24%
Avg 1.5mm if it rains
Cloud Cover
44%
Light drizzle
Pressure
1015.4 hPa
Low volatility
San Juan Weather Conditions & UV Index
Weather Confidence
30-year variance analysis
Based on 10 years of data
~ Weather is generally predictable, but pack for minor variations. A light backup layer is recommended.
Sun Exposure
UV Index & Safety Guide
Protection Needed
SPF 15 for extended outdoor time
UV estimate based on latitude, season & cloud cover. Actual UV may vary.
Outdoor Comfort
How pleasant is it outside?
Dew Point
24.5°C
Humid/Sticky
Heat Index
32.5°C
Feels hotter
😐 Best outdoor time:
Morning hours (before 11 AM)
Marine Conditions
Marine Life
No special warnings. Enjoy the swim!
Swim Index
⚠️ Mixed Conditions
Travel & Logistics Insights
Local Calendar
Business Day
Standard hours in Puerto Rico
Flight Traffic
Busy
75/100 pressure index
Health Advisory
Required
2 vaccines • View Details →
Landing Slots
~162
Daily arrival options (inc. codeshare)
Sunrise, Sunset & Wind in San Juan
Daylight & Sun
Solar Elevation Cycle
🌅 Sunrise
06:50
☀️ Noon
12:21
🌇 Sunset
17:52
⏱️ Daylight
11h 1m
Wind Speed
20.3 km/h
Moderate wind
Sunshine
10.0 hrs
Direct Sun (Cloud-free)
Humidity
81%
Humid / Damp
Travel Intelligence
Exclusive flight analytics & health data for San Juan
Smart Flight Estimator
Airport-to-Airport Logistics
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Travel Health & Safety in San Juan
Travel Comfort Index
Real-time tourism conditions
Weather Quality
☀️ Excellent
Tourist Crowds
🟡 Busy
Price Level
💰💰💰 Expensive
Health & Wellbeing
Meteo-Health Forecast
Stable conditions. Low risk of headaches.
Weather unlikely to affect joint pain.
Moderate fish activity expected.
Air quality is excellent. Perfect for outdoor activities.
Regional Safety Profile
Seismic Activity
Moderate seismic activity. Occasional tremors possible.
Atlantic Hurricane Risk
Season: Jun - Nov
"According to 30YearWeather's analysis of 30 years of NASA satellite data, San Juan on December 16 averages 28.1°C with a 24% precipitation probability. Wedding/Outdoor Event Score: 95/100."
— Source: 30YearWeather.com|Data: NASA POWER (1991-2021)|View Methodology
San Juan Weather History (2010–2024)
Temperature History
Hall of Fame
Records from last 10 years
Better Alternatives Nearby
Consider these dates within ±7 days
💡 Moving your event by a few days could significantly improve weather conditions
Compare Other Cities
Same date (December 16) in other destinations
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📍 Is San Juan Worth Visiting on December 16?
Planning a trip to San Juan on December 16? Our historical weather analysis based on 30 years of NASA satellite data shows that this time of year typically offers vibrant summer conditions averaging 28.1°C with a 24% historical precipitation risk.
✈️ Travel Logistics: Approximately 162 landing slots available daily during this period, indicating manageable crowd levels.
💉 Health Advisory: 7 vaccinations are recommended for Puerto Rico, including COVID-19.
🌊 Coastal Conditions: Water temperature averages 28.1°C (tropical bath). Wave conditions are generally surfers only with heights around 1.95m.
📊 Historical Extremes: The hottest December 16 recorded in the last 30 years saw temperatures hit 29°C in 2018, while the coldest dropped to 21.9°C in 2015.