Key West Average Rainfall by Month

This page shows the average precipitation in each month of the year in Key West, Florida. It is based on NOAA data for the years 1991–2020.
What's the Rainiest Month in Key West?
In Key West, September has the greatest precipitation of any month. On average, Key West gets 7.0 inches of precipitation in September.
September is also the month where rain is most common. 52.6% of days in September will have at least some rain.
What's the Driest Month in Key West?
In Key West, March has the least precipitation of any month. On average, Key West gets 1.53 inches of precipitation in March.
April is the month with the lowest chance of precipitation. 15.1% of days in April will have measurable rain.
Month Precipitation % Chance
January 1.82 in 22.2
February 1.54 in 17.2
March 1.53 in 15.6
April 2.07 in 15.1
May 3.11 in 24.2
June 4.23 in 37.3
July 3.63 in 37.5
August 5.36 in 47.2
September 6.96 in 52.6
October 5.66 in 39.0
November 2.04 in 21.0
December 2.15 in 20.6
Year 40.12 in 29.2
Weather Station Details
Years Station Coordinates
1948–2024 Key West International Airport location
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