25°C is absolutely normal in early January. It usually goes down to 24 and even 23 during the second half of the month. I very much doubt anyone saw 28°C in January, except in very shallow water on a calm and sunny day. In summer I have lots of dives with 30°C in summer and the corals were stunning. I would take third party information about 32°C with a grain of salt, not saying people are making things up but I would confirm it with a few computers before considering it accurate.