REF: 

Weather:
U.S. users can view the 7-day weather forecast in their area, or any area they choose, on their calendar. To enable this option, type your postal code in the appropriate filed and select theEnable weather checkbox. Weather forecasts are provided by the National Weather Service.

Nicolas, I have added this to our features request list for further discussion with the dev. team.  I am changing this from a question thread to an idea to facilitate development tracking.