I've never been on a passenger plane that was anywhere close to being as low as 16 C. Almost all of the ones I've been on have been either normal room temperature (~22 C/72 F) or warmer. Particularly when sitting at the gate in a hot climate, the cabin can get quite warm (27 C/80 F or more.) Sometimes sitting close to exit doors can be cold from what I'm told, but I've never experienced that myself when sitting by one. Sitting near the boarding door while it's open on the ground in a cold climate would obviously be cold, though. I would recommend wearing long sleeves, though, not only due to the possibility of a cooler cabin, but also because you probably don't want your arms laying directly on an armrest where a bunch of other people's arms, hands, etc. have been lately (either in the airport or on the plane.) Another reason for the long sleeves is that, even if the plane itself is warm, the jetways (boarding bridges) can be quite cold in cold climates.
During flight, the temperature will depend on what the cabin crew sets it to, but I've never personally experienced it being cold (and I've been on at least a hundred passenger flights and am cold natured.) For whatever it's worth, Korean Air states that they keep their cabins in the 23-25 C range. They also have some other tips for what to expect on board in that link.
As far as drafts are concerned, this would only happen if the person beside you is using their A/C vent and it's aimed partially at you. Otherwise, no, there are generally no drafts, since it's a sealed, pressurized cabin (I'm assuming we're talking about normal, pressurized airliners here, not tiny unpressurized puddle jumpers.)
An important thing to note, as has been mentioned in a comment, is the low humidity in the cabin. This can dry out your skin, eyes, etc., especially on long flights. If you don't like for your hands to be dry, you might consider taking moisturizing hand lotion with you. However, please, for the sake of the other people on board, do not take scented hand lotion (or wear a significant amount of perfume, etc.) Remember that you are in a closed vessel with a lot of other people, many of whom are probably allergic to perfumes and most of whom probably don't want to smell it, even if they aren't allergic.