Looks like you've got your ducks in a row. Watch the NWS point forecast at
http://forecast.weather.gov/MapClick.php?lat=46.51461098312509&lon=-121.45602973876953
to get a feel for the temperatures to expect and make any fine tuning just before you head out. If the lows are getting down to freezing, be careful about crossing the little finger of Packwood Glacier on the PCT in the morning. I've crossed it (it's only 30 yards or so but with a bad runout) on 4 or 5 different trips and only once felt the need to don my microspikes because it was cold and hard and the usual well-stomped boot ledge wasn't there. It usually looks like this:
http://texasbb.net/files/Goat-Rocks-2013/Day-2/tn/IMG_3147.mod.JPG.index.html