I scuba dive in Monterey, CA every other weekend, and just came back from a liveaboard in Galapagos in May. The water is much warmer this year, and it is very noticeable because usually in Galapagos, divers are expected to wear 8mm wetsuit or dry suit to be comfortable in the water, but this year even a 5mm made me feel too warm. In Monterey, water temp used to be around 11-13°C but this year it’s easily above 16°C, divers also reported more sightings of spiny lobsters which were rare in Monterey because water was too cold for them.