If you love sunshine then you are bound to absolutely fall in love with Cancun. Cancun on average has over 200 days of sunshine. Cancun is considered to be semi-tropical with an average temperature year round of around 80 degrees Fahrenheit. So don't forget your Suntan lotion and shades for this tropical getaway, to simply perfect sun tanning temperatures. During the enjoy lying on the beach. Cancun weather really makes a warm play ground for honeymooners and sweethearts to enjoy together. It's simply a golfers dream with these just-right temperatures to tee-'em up in the tropics.
A run down of the months and their average temperatures are:
January to March 68 to 86 degrees Fahrenheit (20-30°C)
April to June 71 degrees to 89 degrees Fahrenheit (22-32°C)
July to September 75 to 91 degrees Fahrenheit (24-33°C)
October to December 68 to 87 degrees Fahrenheit (20-31°C)
The rainy season is usually September, October, and November. You can expect mid afternoon rain showers sometimes with high winds and down pouring rain. The sun is not gone long and the day becomes bright and shiny again. In May, it has been know to get as high as 100 degrees Fahrenheit, but on the sandy white beaches with the gentle breeze coming in off the Caribbean sea you might not notice. Traveling inland for any archaeological tour during this season you may notice that the temperature is extreme. You should be prepared, dress appropriately and rest often. To take these tours during the summer season it might be better to take evening tours.
Hurricane season begins in July and ends in November. Yes, southern Mexican has been hit by a hurricane in the past, but as long as you watch the weather you will know if there are any tropical storms out there that may be headed your way.
Keeping track of the weather prior to your trip can help you know what items to pack and what the weather will like during your stay. There are some great websites that can give you up to date information regarding what the weather is like in Cancun.
Wunderground.com is a great website for getting a complete 7 day forecast. They also have weather history, almanac and astronomy on their site to give you even more information.
Weatherbase.com has some great information regarding the weather in the past by years. You can even find out the highest recorded and lowest recorded temperatures and the average number of days with precipitation.