Saturday and Sunday will feature gray skies with a good chance of showers and thunderstorms at any point throughout both days. Saturday will feature the better rain chances as a disturbance will be moving northward into Ontario from New York, Pennsylvania, and Ohio. Even with a smaller rain chance on Sunday, you should expect it at any time during the day. If the Canadian model is correct, those rain chances will greatly increase. If the GFS model is correct, then rain chances on Saturday and Sunday will swap around. Highs will be in the mid-60s. At this point, rain chances are at 60% for Saturday and 40% on Sunday.
I'm confident that rain will affect the race weekend at some point, but exact timing and amounts are in question at this point. Either way, I'll definitely be busy with this one.