Weather in the Cayman Islands in September

As temperatures begin to drop slowly, rainfall continues to remain relatively high during the month of September in the Cayman Islands. With rainfall generally coming down in short, heavy bursts, vacationers should be aware that because the islands are fairly low-lying, there is an increased chance for flooding.

Typical Weather in September

September temperatures in the Cayman Islands range from an average low of 79.0 degrees to an average high of 87.0 degrees . On average, it rains in the Cayman Islands a total of 7.0 days during the month . Total precipitation during the month averages 8.3 inches . Nevertheless, all precipitation, no matter how slight, is included in these tables.


The Cayman Islands in September: Key Facts
Monthly Averages
High Low Rainfall
No. of Days
with Rain
87.0° F 79.0° F 8.3 7.0

On a typical September day, during the early morning hours you will probably find the temperature will be around 79.6 degrees. The temperature will rise over the course of the typical September day, reaching somewhere around 86.3 degrees by early afternoon. By early evening, temperatures in the Cayman Islands generally decline to around 81.7 degrees. For the month of September as a whole, temperatures in the Cayman Islands average around 84.0 degrees.


September Temperatures in The Cayman Islands by Time of Day
Early Morning Late Morning Early Afternoon Late Afternoon Early Evening Overall
79.6° F 86.2° F 86.3° F 85.4° F 81.7° F 84.0° F



During September, rain is most likely to occur around 1:00 PM , and least likely to occur around 7:00 AM. To the extent thunderstorms occur in the Cayman Islands during September, they are most likely to occur around 1:00 PM, as shown in the following table.


September Rainfall in The Cayman Islands by Time of Day
  Percent Frequencies of Hourly Observations
Hour Rain
1:00 AM # #
4:00 AM # #
7:00 AM 2.7 % 3.9 %
10:00 AM 2.8 % 1.8 %
1:00 PM 9.6 % 4.5 %
4:00 PM 8.2 % 2.4 %
7:00 PM 2.8 % 1.6 %
10:00 PM # #
ALL 5.3 % 2.8 %


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