Will it be sunny?
Weather
The sun shines most days of the year in Yucatan, which is one of the reasons it makes a great place to visit anytime.

We do not have the traditional four seasons, rather our weather tends to vary as follows:

November - March - Dry, cooler, and sunny.
April - May - Dry, hot, and sunny.
June - September - Hot with rainy periods, sometimes very heavy thunderstorms.
October - Dryer and slightly cooler

Weather forecast for Merida
http://www.intellicast.com/Local/Weather.aspx?location=MXYN0117

Historical weather averages for Merida:
http://www.intellicast.com/Local/History.aspx?location=MXYN0117