just back from a 7 day backpacking trip to bridger wilderness, just south of that area.  Mosquitoes where brutal, all the time, everywhere...with the exception of  windy places.  We were only at @9800 all week and the high 70's & low 80's felt really really hot!  Lows averages about 32 at night, so be prepared in September!  No rain or afternoon hail storms, and that was a first!

https://youtu.be/kPwuaTn_wA8

 

REI Member Since 1979 YouTube.com/philreedshikes