Hi Thomas, welcome to Cruise-Chat. We have cruised with NCL, RCL, CCL, HAL, Princess, and Costa. On all cruise lines I take a sweater with me. On Princess, I normally do not have to wear it in the dining room, but usually do have to wear it in the casino and the shows. If I would guess the temperature of the dining room, it would be 76-78 degrees F. In the buffet area, I do not need it at all. We've been on the Sea, Sun, and Dawn Princess and are sailing on the Emerald next month. On NCL, I found the places I needed my sweater were similar. Usually in the casino and shows I needed it. I get cold when it is under 80 degrees F. The Diamond is a beautiful ship and I do hope you enjoy Princess as much as we do. Take a sweater, just in case. Best wishes!
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