San Juan, Puerto Rico Temperatures: Averages by Month
The numbers here tell you how hot and cold the weather usually is in San Juan, Puerto Rico during each month of the year.
The average high and low temperatures are listed below monthly and annually for the Caribbean city, in both degrees Fahrenheit and Celsius.
Maximums and minimums are only part of the temperature picture. To fill in the rest, there's information on how many days a month get above or below a given temperature.
To find out how often it rises over 70, 80 or 90 °F each month in San Juan, scroll down farther. There are also monthly and yearly counts of days with cool weather.
The first set of high and low temperatures are averages for 2010 to 2019. Everything else here is based on 1991 to 2020 weather.
| High °F | Low °F | High °C | Low °C | |
|---|---|---|---|---|
| 84 | 73 | January | 29 | 23 |
| 84 | 73 | February | 29 | 23 |
| 85 | 73 | March | 29 | 23 |
| 87 | 75 | April | 30 | 24 |
| 87 | 76 | May | 31 | 24 |
| 89 | 78 | June | 32 | 25 |
| 89 | 78 | July | 32 | 26 |
| 89 | 78 | August | 32 | 26 |
| 89 | 78 | September | 32 | 26 |
| 89 | 78 | October | 32 | 25 |
| 86 | 76 | November | 30 | 24 |
| 85 | 74 | December | 29 | 24 |
| 87 | 76 | Year | 31 | 24 |
| High °F | Low °F | High °C | Low °C | |
|---|---|---|---|---|
| 86 | 74 | January | 30 | 23 |
| 89 | 78 | February | 32 | 25 |
| 84 | 73 | March | 29 | 23 |
| 84 | 72 | April | 29 | 22 |
| 83 | 72 | May | 28 | 22 |
| 89 | 78 | June | 32 | 25 |
| 89 | 77 | July | 32 | 25 |
| 85 | 72 | August | 29 | 22 |
| 87 | 76 | September | 31 | 24 |
| 86 | 75 | October | 30 | 24 |
| 89 | 77 | November | 31 | 25 |
| 89 | 78 | December | 32 | 25 |
| 81 | 75 | Year | 27 | 24 |
Days of Hot Weather in San Juan
San Juan's weather is unwaveringly warm. All except four days a year have temperatures in the 80s or 90s Fahrenheit. Yet the heat has its limits. Thermometers in this tropical city typically never reach above 100 °F (38 °C).
| 70 °F 21 °C |
80 °F 27 °C |
90 °F 32 °C | |
|---|---|---|---|
| January | 31 | 30 | 0 |
| February | 28 | 27 | 1 |
| March | 31 | 31 | 2 |
| April | 30 | 30 | 4 |
| May | 31 | 31 | 7 |
| June | 30 | 30 | 12 |
| July | 31 | 31 | 10 |
| August | 31 | 31 | 13 |
| September | 30 | 30 | 13 |
| October | 31 | 31 | 10 |
| November | 30 | 30 | 2 |
| December | 31 | 30 | 1 |
| Year | 365 | 361 | 72 |
How Often San Juan Has Cold Temperatures
Cold weather simply never happens in San Juan. A cool night is when the temperature drops into the 60s F. That occurs on average fewer than 22 days a year.
| 60 °F 16 °C |
70 °F 21 °C |
|
|---|---|---|
| January | 0 | 7 |
| February | 0 | 7 |
| March | 0 | 4 |
| April | 0 | 1 |
| May | 0 | 0 |
| June | 0 | 0 |
| July | 0 | 0 |
| August | 0 | 0 |
| September | 0 | 0 |
| October | 0 | 0 |
| November | 0 | 0 |
| December | 0 | 2 |
| Year | 0 | 22 |
References
Jay Lawrimore, Ron Ray, Scott Applequist, Bryant Korzeniewski, Matthew Menne. 2016. Global Summary of the Month and Year, Version 1.0. NOAA National Centers for Environmental Information.
NOAA National Centers for Environmental Information (NCEI). Climate Normals.