I’m racing tomorrow and just found out that the morning temp is going to be around 58 degrees, which is about 12 degrees colder than normal. The water temp will definitely be above 80 so no wetsuits. I’m a little worried about coming out of the water and really freezing. Am I worrying about nothing? Anybody have any suggestions for how to make the best of this?
I did a similar race - we camped the night before, and it had to be 40-45 when we got up. No more than 50 at the race start. The worst part was I froze during the swim, but the water temperature, while warmer than the air, was somewhere in the 60’s, so a little different than your situation. I think the real reason I froze was my body was already so cold, and then every time my arm came out of the water it froze. I was absolutely dreading the bike, but honestly, as soon as I got moving it was fine. No joke. The air temperature still had to be under 60, but as soon as I started riding I was comfortable. I didn’t even put on arm warmers. So, a suggestion, if you are truly concerned, is to have arm warmers in transition so you can put them on if you need them. The person next to me was doing that but I didn’t even bother with mine and beat her out of there and didn’t look back. Also, if you don’t usually race with gloves, they may help - my biggest problem when I do get cold is fingers and hands freezing and not being able to shift or brake. Good Luck!
Thats Nothin!.. Don’t worry about it.
Here in Michigan its been an especially cool summer. My last race the morning temp was in the upper 40s. So cold my hands went numb during my warm-up bike ride. But, by the time I emerged from the water I had no worries. Your blood will be pumping well enough to keep you warm… especially in the 50’s… If you’re not wearing any sox you might not feel your toes during the bike… but the feeling will return on the run. Cool temps make for great tri weather. Less overheating… have a great race!
There’s little you can do other than change your mental approach. I’ve had only one race this season where I actually felt like I was in a normal temp range coming off T1, let alone on the run.
I have a bit of a circulation problem in my toes due in part to years of three packs a day before I wized up so in warm water/cold air conditions I run on stubs for bit until everything gets juiced up again.
It is a lot easier after doing it a few times and you won’t think about it as much.
I’ve trained outdoors in an 78 deg pool when the air temp was 32. You won’t even notice the air temp during the swim. By the time you get done, you’ll be warm enough you won’t feel cold getting out of the water. I live in Michigan and this summer, 58 has been the typical morrning temperature. I haven’t felt cold getting out of the pool after my morning workouts. Getting in is another matter though 
If you are not wearing a wetsuit, you need to wear something warm right up to the swim start to keep your core temperature up. A wetsuit makes a perfect warmup suit but if you are not wearing one you need to replace it with something else to stay warm before the start. Stay bundled up and strip down right before the start.