Big difference between 13C and 16C in comfort so hopefully the next two weeks allows it to warm up.
And can make some quick acclimatisation if you can go another couple times.
I asked the same Q ahead of Helvellyn, which I think was around 13C in 2020 when a lot of us did it, and then had cold/rain on the bike. Know some struggled, but I was pleasantly surprised at how tolerable it was after trying to acclimatise before hand, and having a decent pre-race dip. I think I raced in just my trisuit in the end and left warm clothes in T1.