Pensacola always warms up sooner than Destin, Walton and PCB. It's because of a natural current that runs onshore from the timberholes. So, while the temp reading of 77 is somewhat high for this time of year, it isn't out of line with the observed cooler temps further east -totally normal.
Related to this is the cobia season. Almost always, the first cobe will be caught between Navarre and the Pensacola pier. These fish are resident cobes, spending the winter in the timber holes and similar, deep-water areas. The reason is that these resident fish follow the warm water current inshore and along the beach. These fish are usually smaller than the migrating fish. The migrating fish that come up from the Dry Tortugas don't do so until a trigger is pulled, based on a combination of minutes of moonlight per night and water temp. When you see cobes caught between Destin and PCB, you know that the migrating fish are here, and that's when you'll see the 100+ lb'ers- the ones that win $100,000 for the angler.