1Humid or sultry — uncomfortably hot because of high humidity, making you sweat; the word Japanese speakers commonly use for muggy summer weather.
夏は蒸し暑くて夜もよく眠れない。
Summer is so humid that I can't sleep well at night.
今日は蒸し暑いから、冷たい飲み物が欲しい。
It's humid today, so I want a cold drink.
エアコンをつけないと部屋が蒸し暑くなる。
Without air conditioning, the room becomes hot and humid.
梅雨の時期は蒸し暑い日が続く。
Humid days continue throughout the rainy season.