Cruise and Beach Destinations
in the Caribbean, Mexico & Beyond
Puerto Rico

San Juan Puerto Rico Average Weather

Condado beach
San Juan beaches are less crowded during the winter because of cool water temperatures. Credit: Wikimedia Creative Commons license
San Juan's average weather is similar to most other Caribbean islands with one exception: it doesn't rain as much during the peak times of the hurricane season.

The Caribbean hurricane season officially runs from June 1 through Nov. 30 each year. The highest amount of rainfall usually hits in September and October with some destinations experiencing as much as 10 to 15 inches of rain in September.

San Juan's historical average is about five to six inches each from August through November. The number of days that it rains averages about 14 from July through December.

This historical New World city on the island of Puerto Rico also has a brief rainy season in May of another six inches of rain.

The winter and early spring months of January through March are a different story. Rainfall averages two to three inches a month. As a result, this time of year also makes San Juan a popular port of call for Caribbean cruises.

That leaves April and December, which are transition months between the dry season and the rainy season.

It rains about 12 to 15 days each month except for the dry season -- especially February through April -- when it rains an average of about nine days a month.

San Juan Temperatures

San Juan Climate Chart
MonthMean TemperatureoFAvg Rainfall (mm) Avg Rain Days
Jan 70.9 83.1 71.4 12.7
Feb70.5 83.7 54.6 9.0
Mar 71.6 84.4 59.7 8.4
Apr72.9 85.8 95.5 8.7
May 74.5 87.3 150.6 12.6
June76.1 88.5 101.6 11.6
July 76.8 88.5 111.0 14.3
Aug76.6 88.7 135.1 14.9
Sept 76.3 88.9 134.1 13.1
Oct75.6 88.3 145.0 13.5
Nov 73.9 85.8 150.9 14.6
Dec72.3 83.8 119.9 14.2
San Juan temperatures are more predictable and stay within a narrow range throughout the year.

The average high temperatures, usually during the day, ranges from the low 80s Fahrenheit during the winter to the high 80s during the summer.

Average lows range from the low 70s to high 70s, mainly at night.

Water temperatures are somewhat cool at times in combination with a wind chill factor and northern currents during the winter. So swimming is sometimes uncomfortable during cooler weather.

April is one of the best months to visit for a combination of warm temperatures and low risk of rain.
Scott S. Bateman is a professional journalist who has traveled widely throughout the Caribbean and the Americas.

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February 17, 2020
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