I am not familiar with this site.
I use the Weather a Channel app. It has a travel feature that let's you plug in locations and travel dates. It doesn't pull them together into an itinerary though.
A Bad Day At Sea [with power] Always Beats A Good Day At Work
Carnival: Glory 2004, Destiny 2008, Splendor 2009, Freedom 2011, Valor 2012, Dream 2013
Celebrity: Summit 2011
Princess: Ruby 2010, 2014, Caribbean 2013, Coral 2014, Regal 2014