蒸し暑い (むしあつい)humid; sultry

蒸し暑い, its kanji, and other words that share them.Open this graph

Kanji in 蒸し暑い

蒸気じょうきsteam; vapour
水蒸気すいじょうきwater vapour; water vapor
蒸しむしsteaming
蒸すむすto steam (food, towel, etc.)
蒸かすふかすto steam (food)
蒸しパンむしパンsteamed bun; steamed bread
蒸し返すむしかえすto reheat; to steam over
蒸気機関じょうききかんsteam engine
暑さあつさheat (of the weather); hotness
猛暑もうしょheat wave; fierce heat
残暑ざんしょlate summer heat; lingering summer heat
暑いあついhot; warm
暑中しょちゅうheight of summer; high summer
暑中見舞しょちゅうみまいsummer greeting card; inquiry after someone's health in the hot season
暑中見舞いしょちゅうみまいsummer greeting card; inquiry after someone's health in the hot season
炎暑えんしょheat wave; intense heat

See how 蒸し暑い connects to the rest of Japanese.