San Juan, Puerto Rico, boasts a tropical monsoon climate, characterized by hot and humid conditions throughout most of the year.
Temperatures typically range from 72°F to 89°F, making it an appealing destination for beach lovers and sun seekers.
The city rarely experiences temperatures below 69°F or above 91°F, ensuring a consistently warm environment.
Rainfall in San Juan shows some variation with the seasons.
The driest months are January and February, with an average of around 0.59 inches of rain.
Conversely, the city can see heavier rainfall from May to October, especially during the peak of the hurricane season.
Visitors can enjoy long daylight hours, although there’s no daylight saving time (DST) here, so the time remains consistent year-round in this part of the Caribbean.
For those planning to visit, it’s useful to check out detailed monthly climate data.
For instance, January averages 82°F, while July peaks at around 85°F.
Understanding these patterns can help you plan the perfect trip to experience the best of San Juan’s warm and inviting weather.
More details and charts are available on various websites such as Climates to Travel and Weather Atlas.
Average Temperature In San Juan, Puerto Rico
San Juan experiences warm temperatures year round.
January, the coldest month, has an average low of 73°F and an average high of 83°F.
In contrast, the hottest month, August, sees an average low of 78°F and an average high of 89°F.
| Month | Average Low (°F) | Average High (°F) |
|---|---|---|
| January | 73 | 83 |
| February | 73 | 83 |
| March | 74 | 84 |
| April | 75 | 85 |
| May | 77 | 87 |
| June | 78 | 88 |
| July | 78 | 89 |
| August | 78 | 89 |
| September | 78 | 88 |
| October | 77 | 87 |
| November | 76 | 85 |
| December | 74 | 83 |
January is notably cooler with February following closely.
April begins to warm up with average temperatures reaching the mid-80s.
By June, nights are warm and lows rarely drop below 78°F.
July and August are the peak of summer, making it the hottest period in San Juan.
In December, temperatures start to drop again, though it remains warm compared to many other locations.
Average Precipitation In San Juan, Puerto Rico
San Juan experiences significant rainfall throughout the year, with certain months being notably wetter than others. Snow is practically non-existent due to the region’s tropical climate.
Average Rainfall In San Juan, Puerto Rico
Rainfall in San Juan is variable, with the wettest month being May, when the city receives an average of 6 inches of rain.
The driest month is February, which sees approximately 0.59 inches of precipitation.
Rain generally falls in brief, heavy showers, contributing to the yearly total of about 56 inches.
| Month | Rainfall (inches) |
|---|---|
| January | 3.2 |
| February | 0.59 |
| March | 1.1 |
| April | 4.1 |
| May | 6.0 |
| June | 3.5 |
| July | 4.7 |
| August | 6.1 |
| September | 6.0 |
| October | 5.7 |
| November | 3.5 |
| December | 2.9 |
On average, San Juan has around 198 rainy days a year. This consistent precipitation helps maintain its lush, tropical environment.
Average Snow In San Juan, Puerto Rico
San Juan’s tropical climate means that snow is an extremely rare occurrence. The city sits at a latitude where temperatures remain warm throughout the year, with winter temperatures averaging around 70°F.
In areas where snow can be a significant factor, such as higher latitudes and altitudes, precipitation in the form of snow and ice can impact daily life. For more on environments with snow and ice, explore Snow and Ice.
In San Juan, even during its coolest months, temperatures are far too high for snow to fall. Thus, visitors to San Juan need not worry about snow at any time during the year.
Average Sun In San Juan, Puerto Rico
San Juan, Puerto Rico enjoys a tropical climate with abundant sunshine throughout the year. Residents and visitors can expect plenty of clear days with consistent patterns of daylight.
Average Daily Shortwave Solar Energy In San Juan, Puerto Rico
San Juan receives a high amount of average daily shortwave solar energy.
This energy peaks in June and is lowest in December, following the pattern of daylight hours.
Monthly Average Shortwave Solar Energy
| Month | Average kWh/m² |
|---|---|
| January | 4.9 |
| February | 5.4 |
| March | 6.0 |
| April | 6.4 |
| May | 6.6 |
| June | 6.7 |
| July | 6.6 |
| August | 6.3 |
| September | 6.1 |
| October | 5.7 |
| November | 5.1 |
| December | 4.7 |
San Juan’s longest day occurs around June 21, with just over 13 hours of daylight.
The shortest day falls on December 21, providing about 11 hours of daylight.
Cloud cover does impact sunlight, with fewer clear days between May and November.
Overcast days are infrequent, making San Juan an ideal location for sun exposure year-round.
Sunrise and sunset times vary little throughout the year, providing regular opportunities to enjoy the sun’s rays.
Average Humidity In San Juan, Puerto Rico
San Juan, Puerto Rico, experiences varying levels of humidity throughout the year. The city is known for its high relative humidity due to its tropical climate.
Monthly Humidity Levels
| Month | Average Humidity (%) |
|---|---|
| January | 74% |
| February | 73% |
| March | 71% |
| April | 72% |
| May | 75% |
| June | 76% |
| July | 76% |
| August | 76% |
| September | 76% |
| October | 77% |
| November | 76% |
| December | 75% |
October is the most humid month with an average relative humidity of 77%, and March is the least humid month with 71% humidity.
Climate Characteristics
Humidity in San Juan often makes the air feel muggy or oppressive, especially during the warmer months.
The dew point is often high, which contributes to the overall feeling of humidity in the air.
Residents often experience oppressive conditions for most of the year due to these high levels of humidity. The annual average humidity in San Juan is around 75%.
Average Wind In San Juan, Puerto Rico
San Juan experiences varying wind speeds throughout the year. The average wind speed in San Juan varies by month and has a noticeable impact on the weather.
Monthly Average Wind Speed
| Month | Average Wind Speed (mph) |
|---|---|
| January | 12 |
| February | 13 |
| March | 13 |
| April | 12 |
| May | 12 |
| June | 13 |
| July | 14 |
| August | 13 |
| September | 12 |
| October | 11 |
| November | 10 |
| December | 11 |
The average wind speed is typically higher from January through August.
This period includes the windiest month of the year, which is July.
During these months, wind speeds often exceed 13 mph.
On the other hand, the wind tends to be calmer from October to December, with average speeds dropping to around 10-11 mph.
Average Air Quality In San Juan, Puerto Rico
San Juan, Puerto Rico generally enjoys good air quality most of the year.
Air Quality Index (AQI):
- The AQI in San Juan often falls in the “Good” category, indicating that air pollution poses little or no risk to health.
- PM2.5 levels are typically low, meeting the WHO air quality guidelines.
| Month | Average AQI | PM2.5 Level (µg/m³) |
|---|---|---|
| January | 15 | 5.2 |
| February | 16 | 5.8 |
| March | 18 | 6.1 |
| April | 19 | 6.5 |
| May | 20 | 7.0 |
| June | 22 | 7.4 |
| July | 23 | 7.8 |
| August | 21 | 7.2 |
| September | 19 | 6.7 |
| October | 18 | 6.3 |
| November | 17 | 6.0 |
| December | 16 | 5.6 |
Pollutants Monitored:
- Main pollutants include PM2.5, sulfur dioxide (SO2), nitrogen dioxide (NO2), carbon monoxide (CO), and ozone (O3).
- PM10 levels, ozone, and carbon monoxide are also monitored but typically remain low.
Other Factors:
- Visibility in San Juan is typically good given the low levels of air pollutants.
- Pressure conditions are typical for a tropical climate, with minor variations affecting air quality minimally.
For more information on real-time air quality, visit AccuWeather or IQAir.
Topography Of San Juan, Puerto Rico
San Juan, Puerto Rico, is known for its unique topography. The city is located at a latitude of 18.467 and a longitude of -66.118, covering an area with diverse terrain.
The average elevation of San Juan is about 194 feet. However, elevation in the area can vary, ranging from sea level along the coast to higher points inland.
San Juan’s location along the northern coast of Puerto Rico places it directly beside the Atlantic Ocean. This proximity to water significantly influences its topography and climate.
Elevation Table:
| Location | Elevation (ft) |
|---|---|
| San Juan (Average) | 194 |
| San Juan (Coastal) | Sea level |
The sea temperature near San Juan also affects its environment. The water is warmest in September, averaging 84°F. Cooler water temperatures, around 79°F, are typical from January to April.
San Juan’s topographic variation can influence its weather patterns, leading to a mix of humid conditions, occasional rain, and sunny days.
Extreme Weather Events That Occur In San Juan, Puerto Rico
San Juan, Puerto Rico, experiences a range of extreme weather events that impact the region significantly.
Hurricanes and Tropical Storms: These are common due to San Juan’s location in the Caribbean. The hurricane season runs from June to November, with peak activity often seen in September. Hurricanes bring strong winds, heavy rain, and can cause severe flooding.
Heat Waves: Extreme heat is becoming more frequent. Recently, Puerto Rico faced a record-breaking heat index of 125 degrees. High temperatures, combined with humidity, can pose health risks.
Flash Flooding: Heavy rainfall, often from tropical systems, leads to flash flooding. The combination of intense rains and the island’s topography can cause rapid water rise, affecting both urban and rural areas.
Tables by Month Showing Average Rainfall and Temperature Extremes:
| Month | Average Rainfall (inches) | Average High Temp (°F) | Average Low Temp (°F) |
|---|---|---|---|
| January | 3.4 | 83 | 72 |
| February | 2.2 | 83 | 72 |
| March | 2.3 | 84 | 72 |
| April | 3.3 | 85 | 73 |
| May | 4.4 | 87 | 75 |
| June | 4.7 | 89 | 77 |
| July | 4.9 | 89 | 77 |
| August | 6.0 | 89 | 77 |
| September | 6.6 | 88 | 77 |
| October | 6.1 | 88 | 76 |
| November | 5.1 | 86 | 75 |
| December | 4.3 | 84 | 73 |
Drought: Periods of reduced rainfall can also lead to drought conditions, affecting water supply and agriculture.
Look Out Periods: Residents and visitors should be extra cautious during the hurricane season from June to November and during peak heat months from June to September.
Best Time Of The Year To Visit San Juan, Puerto Rico
San Juan offers unique experiences throughout the year. Each season has its own charm, weather, and activities.
What Is San Juan, Puerto Rico Like In Spring
Spring (mid-April to June) is a pleasant time to visit San Juan. The weather is warm with temperatures usually hovering in the mid-80s Fahrenheit. This period follows the busy winter tourist season and precedes the humid summer.
Rain is less frequent in spring, making it ideal for outdoor activities. Visitors can enjoy the many beautiful beaches, explore the historic Old San Juan, or hike in El Yunque National Forest.
Table: Average Temperature and Rainfall in Spring
| Month | Temperature (°F) | Rainfall (inches) |
|---|---|---|
| April | 84 | 3.5 |
| May | 85 | 4.6 |
| June | 86 | 4.7 |
What Is San Juan, Puerto Rico Like In Summer
Summer in San Juan (June through August) is the rainy season. The temperatures can reach the high 80s to low 90s Fahrenheit. This period is also the hurricane season, and heavy rains are common.
Table: Average Temperature and Rainfall in Summer
| Month | Temperature (°F) | Rainfall (inches) |
|---|---|---|
| June | 86 | 4.7 |
| July | 89 | 5.3 |
| August | 89 | 7.0 |
Despite the rains, summertime can still be enjoyable. Many tourists prefer water-based activities such as swimming, surfing, and snorkeling. The lush green landscapes of the island come to life due to frequent showers.
What Is San Juan, Puerto Rico Like In Fall
Fall (September to November) is part of the hurricane season, and rainfall remains high. Temperatures stay in the mid-80s Fahrenheit, making it warm but often wet. This is usually a less popular time for tourists due to the weather.
Table: Average Temperature and Rainfall in Fall
| Month | Temperature (°F) | Rainfall (inches) |
|---|---|---|
| September | 88 | 6.7 |
| October | 87 | 6.6 |
| November | 85 | 6.0 |
What Is San Juan, Puerto Rico Like In Winter
Winter (December to early April) is the driest and most pleasant time to visit San Juan. The weather is mild with temperatures in the low-to-mid 80s Fahrenheit.
Rainfall is minimal during these months.
Table: Average Temperature and Rainfall in Winter
| Month | Temperature (°F) | Rainfall (inches) |
|---|---|---|
| December | 83 | 3.0 |
| January | 82 | 2.9 |
| February | 83 | 2.5 |
Winter is the peak tourist season. Activities include visiting beaches, attending festivals, and exploring historic sites.
The comfortable weather makes it perfect for sightseeing and other outdoor activities.