We booked the afternoon tour, and we were a little skeptical about the sunny weather. Luckily, the weather was partly cloudy with very clear sight that day. The tour started at 1:30 pm as expected, with a quick briefing by our guide aka marine biologist Isaiah. We started going more into the Monterey bay and then into the Pacific, and after about 45 min to an hour, we had a really good sighting of the humpback whales and 3 kind of dolphins during the tour :) :) Our captain gave enough time to take pictures and videos of marine wildlife. The crew always kept us entertained throughout the journey, and I will totally recommend going whale watching via Discovery Whale Watch.
Few tips: eat light, carry dramamine for sea sickness, wear water resistant layers.