The average year-round temperature in Isla Mujeres is 79 Fahrenheit, but the location does have defined seasons throughout the year. Typically, there is a dry season between December and April, with a wet season lasting between May and November.
However, Isla Mujeres also has a hurricane season, with most of the stormy weather occurring in September and October. Therefore, while it’s the cheapest time to visit, it may be best to avoid Isla de Mujeres during these months.