The weather forecast for the 23rd is for a beautiful fall day: Sunny with a high around 70.
You can forecast that far ahead? Being from New England where the weather changes on a dime, I find this hard to believe... LOL.
In any event, I sure hope we have that perfect weather you predicted. The last couple of times Zelig and I came down to DC we brought horrendous snowstorms with us. There shouldn't be any snow danger in September though... ;-)