San Juan Average Rainfall by Month

This page shows the average precipitation in each month of the year in San Juan, Puerto Rico. It is based on NOAA data for the years 1991–2020.
What's the Rainiest Month in San Juan?
In San Juan, November has the greatest precipitation of any month. On average, San Juan gets 7.4 inches of precipitation in November.
November is also the month where rain is most common. 68.8% of days in November will have at least some rain.
What's the Driest Month in San Juan?
In San Juan, March has the least precipitation of any month. On average, San Juan gets 2.18 inches of precipitation in March.
March is also the month where rain is least common. 42.2% of days in March will have measurable rain.
Month Precipitation % Chance
January 4.06 in 59.4
February 2.58 in 53.5
March 2.18 in 42.2
April 4.60 in 47.8
May 5.53 in 53.3
June 4.65 in 50.2
July 6.01 in 61.3
August 6.29 in 63.9
September 6.49 in 61.0
October 5.06 in 57.1
November 7.36 in 68.8
December 4.85 in 65.1
Year 59.67 in 57.0
Weather Station Details
Years Station Coordinates
1956–2024 San Juan Airport location
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