Running in the Rain Advice/Gear

Hi all, 

It looks like it will rain for the NYCRuns Brooklyn Half this weekend, and I am trying to figure out what to wear on race day, or how to prepare for waiting outside in the hours before the race. 

I was wondering if anyone had any recs for rain jackets or rain running gear? What should I be looking for materials-wise/breathability? How do you all stay motivated in the rain? 

Any advice or tips are appreciated!