What is the likelihood of spotting whales in the Sea of Cortez or other Mexican Riviera ports in October? We are booked on Carnival Splendor to PV, Mazatlan and Cabo. Seeing whalies would make the cruise that much better for the DW, though we know we are out of the main season.
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
Star Clippers: Royal Clipper 2015
I donot think you will see any whales. The season on the MR is from December till Mid March, so it looks like you are there too early in the season.
Maybe (very small chance) you see some on their way while sailing.