hu ‧ mid /ˈhjuːməd, ˈhjuːmɪd/ BrE AmE adjective
[ Date: 1300-1400 ; Language: Latin ; Origin: humidus , from humere 'to be slightly wet' ]
if the weather is humid, you feel uncomfortable because the air is very wet and usually hot ⇨ humidity :
Tokyo is extremely humid in mid-summer.
humid air/climate etc