During your vacation in the Cayman Islands you'll very likely benefit from balmy weather regardless of how you time your visit. During the month of December, the temperature doesn't vary much during the day.

The daily high temperature averages degrees declining to degrees during the middle of the night.

This data indicates that during the first part of the month the daily low averages degrees while the average daily high is degrees. If you vacation during the middle of the month the daily low is typically around degrees and the high is about degrees on average. Over the last part of December the low averages degrees while the average high temperature is degrees. To learn more about temperature fluctuations during December in the Cayman Islands, review the table found above.