I stumbled upon this video while adding some Ocean Beach stuff on Youtube. It was quite a surprise to see, as when we were there in August, the waves/swells were only about 3 feet high, and the waters looked pretty scary then (Ocean Beach is notorious for its strong cross-currents). Judging by the height of the waves in relation to the height of the surfers here, some of the waves are about 18 feet tall, if not a bit more.
Here’s a photo that is representative of the wave heights when we visited last summer:
The surf forecast for today (January 11 2016) is 8- to 12-foot waves. You can check the surf report for daily updates at Ocean Beach Surf Report at Surfline.com.