In reply to norrisdan71:
Long, long ago I did a marathon where it was snowing at the finish. Looked like the retreat from Moscow. The only difference to my normal running kit was a lightweight pair of gloves.
I'd be reluctant to change any running kit so close to the event. Rubbing could be a big problem. If absolutely necessary go for something really fine but thermal. Old fashioned Lifa comes to mind. That and a normal running vest on top. an other option is sleeves for your arms. Usually biking kit. That advice is really for cold AND wet but you're more likely to be just wet.
I've no idea what the finish details are for your event but make sure that you get into something warm and dry ASAP. The proverbial bin bag helps as does the usual bit of tinfoil. These are useful at the start as well. Chuck them away when on the go.
You should be OK in shorts if the temp is around ten. Wouldn't bother with waterproof socks. Likely to be wet feet anyway after a while. Wear your normal socks but ensure that you stick a bit of Vaseline on. Not too much.
Best of luck.