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.

10-year temperature averages for San Juan, 2010 to 2019
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
30-year temperature averages for San Juan, 1991 to 2020
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).

Number of days in San Juan of at least 70, 80 or 90 °F
  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.

Days per month on average in San Juan when the minimum temperature drops to 60 or 70 °F or below
  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.

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