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CNN.com
http://weather.cnn.com/weather/forecast.jsp?locCode=CUN
Five day weather forecast for Cancun, Mexico including satellite images.
Intellicast
http://www.intellicast.com/Local/IntlLocalStd.asp?loc=mmun&seg=LocalWeather&prodgrp=Forecast
Ten day local weather forecast.
Weather Underground
http://www.wunderground.com/global/stations/76590.html
Seven day Cancun forecast.