The Yucatan has two main climatic seasons: a rainy season (May to mid-Oct) and a dry season (mid-Oct to Apr).
The dry season is simply that; dry. In February and March you may never see the rain. Some days the rain will roll into a city or a coastal region for a brief period, and not at-all affect another part of the same city. During these winter months, temperatures average 70–75 degrees during the day and about 60 degrees in the evening.
The Rainy or Hurricane season is May/ June through October and particularly affects the Yucatán Peninsula and the southern Pacific coast. June, July, and August are very hot and humid on the Yucatán Peninsula, with temperatures rising into the mid-80s and 90s Fahrenheit.
In the gallery you can view a photo of the Hurricane patterns from 2010. They tend to not run directly through The Gulf of Mexico and the populated areas of The Yucatan, but do have some affect on the region. Here at StumbleAbroad, we display the current weather in Merida, Yucatan, Mexico.
Content Source: http://www.dummies.com/how-to/content/when-to-go-to-mexico.html
header image, unedited version at http://unvegan.com/reviews/eating-big-at-little-polynesian/
gallery image, hurricane patterns http://aclarando.wordpress.com/category/huracan/page/2/