I can't generalize about late September weather, but I can give you a weather report for your time period from five years ago: My wife and I climbed up to Trail Camp in 2011 on September 22 and summited on 9/23. The sky was mostly cloudless both days (i.e., no snow) Our night at TC was windless. Temps were cold when dark (felt like high 20s/low 30s) and cool on the summit, but were never uncomfortable. We were off the mountain on the 23rd, but woke in Lone Pine early on the 24th to some very different conditions: At 8am the summit was completely enveloped in swirling, dark, ugly clouds. One day after perfect weather, the summit didn't look like any place I wanted to be near.
I think major storms aren't typical until October, but be prepared for anything, including weather that changes on you quickly - day to day, or even over just a few hours. Watch the weather reports and conditions and be prepared to bail on a summit attempt if conditions look questionable.
We'll be hiking the mountain on the exact same days this September as we did in 2011, so maybe we'll see you there. Like you, we hope that the weather is good!
Last edited by Dave F; 07/28/16 08:43 PM.
