It's been raining in Cancun for several days now, and there has been some flooding both in Cancun and along the Riviera Maya. I visited the area a couple of weeks ago to witness the Sacred Mayan Journey and enjoyed good weather the whole time - it rained only twice during my visit, both times showers that lasted less than an hour. Visitors this past week haven't been so lucky. According to the regional report of Conagua, Mexico's National Water Commission, the amount of rain that has fallen since last Sunday in the northern part of the state of Quintana Roo is equivalent to 35% of the state's average annual rainfall. The worst flooding has been in Cancun city, with the water level rising up to a meter above the street level, but Kukulcan Avenue, the main road that runs along the hotel zone, has also been affected.
The tropical depression that caused the rain in Cancun has now developed into Tropical Storm Andrea in the Gulf of Mexico which is now heading toward Florida. Andrea is not expected to develop into a hurricane. More information from the National Hurricane Center.
Rainy season in central and southern Mexico lasts roughly from May to October. In general rainy season is not a bad time to visit; it's rare that you will get several days of rain in a row. If you do happen to get rain on your vacation, there are other things to do. In Cancun, visit the new Maya museum that's located in the hotel zone, go shopping in the many malls, enjoy a spa treatment, and take advantage of the city's legendary nightlife. Read more about rainy season in Mexico.