Peak in September
Coolest in December
Heavy in September
Peak in dry season
Sea Temperature
Atlantic Ocean(Océano Atlántico)
Annual Average
Perfect for swimming and water sports
Based on average sea surface temperature
Océano Atlántico
San Juan coastline
San Juan Monthly Weather Guide
Click any month to explore daily weather forecasts
January
February
March
April
May
June
July
August
September
October
November
December
Essential Travel Info for San Juan
Currency
USD
$ United States dollar
Language
English
+1 more
Driving
Right side
Best Time to Visit San Juan
Location, climate overview & historical trends
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📍 18.4655° N, 66.1057° W
Open in Google MapsSan Juan is a prominent destination in Puerto Rico.
Located at 18.47°N latitude,San Juan experiences a tropical climate with warm temperatures year-round.
Based on 30 years of data, September is the warmest month (avg. 31°C), while December is the coolest. September sees the most rain (45% chance), making January the driest month.
Best Time to Visit
NASA POWER Data (1991-2021)January, February, March
Best months to visit
30°C
Avg High
Based on 30 years of NASA satellite data,San Juan receives approximately 671mm of rainfall annually. These months offer optimal temperatures and minimal rain probability for your visit.
Climate Trends
EXCLUSIVE1995-2040 Temperature Trend
1995 Avg
30°
2024 Avg
29.5°
2040 Proj
29.9°
+-0.15°C
per decade (observed)
+0.26°C
per decade (CMIP6)
🌡️ San Juan has warmed by +-0.4°C since 1995. By 2040, an additional +0.4°C is projected (based on CMIP6 rate of 0.258°C/decade), for a total of +-0.0°C from 1995 baseline.
NASA POWER (1995-2024) + CMIP6 (CMCC_CM2_VHR4, EC_Earth3P_HR, FGOALS_f3_H, HiRAM_SIT_HR, MRI_AGCM3_2_S, NICAM16_8S)
Travel Intelligence
Exclusive flight analytics & health data for San Juan
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Airport-to-Airport Logistics
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Flight Connectivity Analysis
Airport traffic data & seasonal patterns
Balanced traffic
0
slots per day
Peak
Mar
Low
Oct
Monthly Traffic Distribution
Key Connections
Health & Safety Advisory
CDC travel health recommendations
COVID-19
All eligible travelers should be up to date with their COVID-19 vaccines. Please seeYour COVID-19 Vaccinationfor more information.
Hepatitis A
Recommended for unvaccinated travelers one year old or older going to Puerto Rico.Infants 6 to 11 months old should also be vaccinated against Hepatitis A. The dose does not count toward the routine 2-dose series.Travelers allergic to a vaccine component should receive a single dose of immune globulin, which provides effective protection for up to 2 months depending on dosage given.Unvaccinated travelers who are over 40 years old, are immunocompromised, or have chronic medical conditions planning to depart to a risk area in less than 2 weeks should get the initial dose of vaccine and at the same appointment receive immune globulin.
Hepatitis B
Recommended for unvaccinated travelers of all ages traveling to Puerto Rico.
Measles
Cases of measles are on the rise worldwide. Travelers are at risk of measles if they have not been fully vaccinated at least two weeks prior to departure, or have not had measles in the past, and travel internationally to areas where measles is spreading.All international travelers should be fully vaccinated against measles with the measles-mumps-rubella (MMR) vaccine, including an early dose for infants 6–11 months, according toCDC’s measles vaccination recommendations for international travel.
Rabies
Dogs infected with rabies are not commonly found in Puerto Rico.Rabies is commonly found in some terrestrial wildlife species and bats.If rabies exposures occur while in Puerto Rico, rabies vaccines are typically available throughout most of the country.Rabies pre-exposure vaccination considerations include whether travelers 1) will be performing occupational or recreational activities that increase risk for exposure to potentially rabid animals and 2) might have difficulty getting prompt access to safe post-exposure prophylaxis.Please consult with a healthcare provider to determine whether you should receive pre-exposure vaccination before travel.For more information, seecountry rabies status assessments.
Typhoid
Recommended for most travelers, especially those staying with friends or relatives or visiting smaller cities or rural areas.
+1 more
Source: CDC Travelers' Health
View Complete Health GuideSan Juan Climate Data by Month
Historical temperature and precipitation averages
| Month | Avg High (°C) | Rain Probability (%) | Status |
|---|---|---|---|
| January | 28°C | 20% | ✨ Perfect |
| February | 28°C | 21% | ✨ Perfect |
| March | 29°C | 21% | 😊 Pleasant |
| April | 30°C | 26% | 😊 Pleasant |
| May | 30°C | 31% | 😊 Pleasant |
| June | 31°C | 26% | 🔥 Hot |
| July | 31°C | 28% | 🔥 Hot |
| August | 31°C | 36% | 🔥 Hot |
| September | 31°C | 45% | 🌧️ Rainy |
| October | 30°C | 43% | 🌧️ Rainy |
| November | 29°C | 36% | Neutral |
| December | 28°C | 21% | ✨ Perfect |
Weather in Cities Near San Juan
Explore climate data for popular destinations within easy reach
Charlotte Amalie
US Virgin Islands
Punta Cana
Dominican Republic
St. John's
Antigua and Barbuda
Roseau
Dominica
Kralendijk
Bonaire
Providenciales
Turks and Caicos
Compare weather conditions with nearby destinations for your trip planning
Compare San Juan Weather vs Popular Destinations
Similar Climate Destinations
Discover destinations with weather similar to San Juan
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India
Ao Nang
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Brasília
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Cairns
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These destinations share similar weather patterns with San Juan. Perfect alternatives if you're looking for the same climate in a different location.
San Juan Weather FAQ
When is the best time to visit San Juan?
Honestly, look for months with mild temperatures (20°C-25°C) and low rain chance. Based on historical data, January, February, March are usually great choices.
When is the hottest month in San Juan?
September is historically the hottest month in San Juan with average highs of 31°C.
When does it rain the most in San Juan?
September typically sees the highest probability of rain (45%).
Is San Juan expensive?
Prices vary by season. The "Perfect" weather months usually coincide with peak tourist season and higher prices, while the rainy or cold months offer better deals.