December through April for Gray Whales. They have volunteers that sit there and count them. If you stand nearby you can hear them say where to look if they spot a blow. Summer months Blues are around. 50/50 chance of seeing a whale anytime you go.
I was only there one time, so I really couldn't see any whales there, but I would try Catalina island if you want to see the whales there, even San Francisco too.
You are towards the end of the whale watching season
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