Warm is good when working honeybees in supers.  A warm bee is a happier bee.  Wax is softer and honey is runnier when it's hot, but that's not liable to make too much a difference except to make the honey easier to get out of the comb after you're done. 

 If I were you, I'd beg borrow or steal some beekeeping headgear or mosquito netting at least.  Wear long clothes, boots, and gloves.  Tape up or tuck in your sleeves at your ankles and wrists and make sure there are no holes around your neck.   Bees climb upward when they land and love to get in cracks.  Work slowly and don't squish any bees if you can help it.  The bees can tell and they get angry when there are squished bees around.  A proper bee smoker or some safe portable form of smoke (no, I can't think of one besides a real smoker either) would help to move excess bees off the comb before cutting it so you don't have a thousand in your bucket when you put the comb in and go to leave. Also, I always worked hives in the daylight when I could.  Any time I worked them at night I used a dim red flashlight to see.

 p.s.  Don't sue me if you get stung a hundred times or start a big fire with your home-made smoker!   Some hives are grouchy and others are calm and easy to work with.