There was a boat checking into the Amigo net a few years ago trying to make the coastal passage
down the coast to Panama
in July. He didn't make it any further then Manzanillo (about 100 miles South East of Puerto Vallarta). He got stopped by storm after storm coming up the coast.
The problem with doing the route
coast-wise is once hurricane
season gets going the storms go up the coast a bit before heading off shore. So you will have the very real possibility of a tropical storm threatening fairly often.
On the other hand I have no idea how you'd do this passage offshore
without getting completely clobbered. Just take a look at the latest sat picture of the area:
All those red and yellow blobs are big thunderstorms just waiting for you off shore. It's all this convection that will turn into tropical storms from June thru October.
I think your best bet is to fuel
up and beat feet as far down the coast as you can make it. Get a slip in PV and wait for a 'break'. Then motor-motor-motor as quick as you can to Huatulco (about 700 miles), stopping in Zihuatanejo and Acapulco for fuel
. Once you get South of Huatulco the likelihood of a tropical storm is diminished (though not completely absent) and you can continue on down the coast at a more leisurely pace.