Given those temperatures and uncertain weather conditions...
My clothing for 4-5 days would be as follows:
-Softshell tech hiking pants
-2 pairs Capilene midweight bottoms
-Capilene silkweight longsleeve top
-1 Polartech long sleeve shirt
-Montbell Alpine Light Down Jacket
-3 pairs Wigwam Light Hiker socks
-1 pair Heavy Cushion Smartwool hiking socks
-2 pairs Capilene silkweight boxers
-2 pairs of trunk style shorts (no cotton)
-2 wicking short sleeve tops
-GoreTex Paclite rain jacket
Socks are my most important item. I have tested almost every brand and style and won't skimp on quality or quantity.