The mammal was found floating in the surf.
[Ads /]
Experts conducted a necropsy Monday afternoon to determine the whale's cause of death.
RELATED: Dead humpback whale washes ashore at San Francisco's Baker Beach
This is the 17th whale to wash ashore in the San Francisco Bay this year.
[Ads /]
In April, four whales were found dead on Bay Area shores in just over a week.
See more stories and videos about the environment here.