Because of its favorable location and its beneficial proximity to the sea, Cancun and the Mexican Caribbean has good weather throughout the year. During August, the temperature doesn't change much during the course of a typical day.
Temperatures will peak at about degrees dropping to degrees overnight.
As indicated above, during the early part of the month the low temperature averages degrees and the high averages degrees. If you vacation during the middle of the month the low temperature will typically average degrees while the daily high average around degrees. Over the last part of August the lowest temperature reading averages degrees and the high temperature averages degrees. For more detailed information about August temperatures in Cancun and the Mexican Caribbean, browse the above table.