While nature can always throw a curveball, there is a very high chance of seeing humpback whales if you book your trip between mid-July and late-September. There is a high number of whales in the area during this time, which means chances of spotting them are high. This also happens to be the dry season, meaning the ocean is usually calmer and visibility is improved with little rain. While many humpback whales begin leaving the area after September, some mothers stick around a little longer with their calves. However, with less whales in the area, sightings become more fleeting.