Sticky, as the weather (5)
I believe the answer is:
muggy
(Other definitions for muggy that I've seen before include "Oppressively humid" , "close" , "Warm and humid" , "Damp and stifling" , "Unpleasantly humid" .)
I believe the answer is:
muggy
(Other definitions for muggy that I've seen before include "Oppressively humid" , "close" , "Warm and humid" , "Damp and stifling" , "Unpleasantly humid" .)