November 18 is generally a great time to visit San Juan. While there is a slight chance of rain (38%), showers are usually brief. Expect comfortable 29°C weather. San Juan is seeing high visitor numbers, so iconic spots may be busier than usual.
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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 November 18
"Warm & Sunny. Expect average highs of 28.9°C. 38% chance of rain."
What to Wear in San Juan in November
Based on historical data for November 18, San Juan typically experiences temperatures between 23.6°C and 28.9°C. We recommend packing t-shirt, light clothing, umbrella to stay comfortable. With a 38% chance of rain, keeping a raincoat or umbrella handy is a smart move.
Complete Packing Guide
Weekly breakdown & essential items for San Juan
Smart Suitcase
- T-Shirt
- Light Clothing
- Umbrella
Average High
28.9°C
Daytime Peak
Average Low
23.6°C
Nighttime Low
Feels Like
34.9°C
🔥 Heat index effect
Rain Chance
38%
Avg 2.6mm if it rains
Cloud Cover
51%
Light drizzle
Pressure
1013.2 hPa
Low volatility
San Juan Weather Conditions & UV Index
Weather Confidence
30-year variance analysis
Based on 10 years of data
🎯 This date historically delivers consistent weather 86% of the time. Safe to plan outdoor activities with confidence.
Sun Exposure
UV Index & Safety Guide
Protection Needed
SPF 15 for extended outdoor time
Type I-II
🔴 160 min to burn
Type III-IV
🟡 240 min to burn
Type V-VI
🟢 400 min to burn
UV estimate based on latitude, season & cloud cover. Actual UV may vary.
Outdoor Comfort
How pleasant is it outside?
Dew Point
25.5°C
Humid/Sticky
Heat Index
34.9°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
71/100 pressure index
Health Advisory
Required
2 vaccines • View Details →
Landing Slots
~154
Daily arrival options (inc. codeshare)
Sunrise, Sunset & Wind in San Juan
Daylight & Sun
Solar Elevation Cycle
🌅 Sunrise
06:34
☀️ Noon
12:11
🌇 Sunset
17:48
⏱️ Daylight
11h 13m
Wind Speed
18 km/h
Gentle breeze
Sunshine
9.5 hrs
Direct Sun (Cloud-free)
Humidity
82%
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
⛅ Good
Tourist Crowds
🟢 Moderate
Price Level
💰💰 Moderate
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 November 18 averages 28.9°C with a 38% precipitation probability. Wedding/Outdoor Event Score: 85/100."
— 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
November 25
28.7°C • 22% rain
Score
92
November 24
28.7°C • 25% rain
Score
91
November 23
28.8°C • 29% rain
Score
90
💡 Moving your event by a few days could significantly improve weather conditions
Compare Other Cities
Same date (November 18) in other destinations
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📍 Is San Juan Worth Visiting on November 18?
Planning a trip to San Juan on November 18? Our historical weather analysis based on 30 years of NASA satellite data shows that this time of year typically offers vibrant summer conditions averaging 28.9°C with a 38% historical precipitation risk.
✈️ Travel Logistics: Approximately 154 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 29.2°C (hot soup). Wave conditions are generally surfers only with heights around 1.57m.
📊 Historical Extremes: The hottest November 18 recorded in the last 30 years saw temperatures hit 31°C in 2019, while the coldest dropped to 23.1°C in 2019.