muggy

adjective

mug·​gy ˈmə-gē 

muggier; muggiest

: unpleasantly warm and humid

mugginess

ˈmə-gē-nəs 

noun

Synonyms of muggy

• humid
• damp

Examples of muggy in a Sentence

a muggy day in August

It's very muggy out today.

Recent Examples on the Web

It’s guaranteed to leave a smooth, humidity-resistant finish that holds up on muggy days and adds a ton of shine to dull and overworked strands. — Valeriya Chupinina, Vogue, 22 Sep. 2026

Stage lights beamed down on me, and the ferry cabin itself was extremely muggy. — Antonio Ferme, Variety, 19 Sep. 2026

Running a dehumidifier in your office during the muggiest months of the year can also help keep mold at bay. — Katelyn Squiers, Better Homes & Gardens, 16 Sep. 2026

Another bout of brutal heat and energy-sapping humidity socked Southern California on Thursday, continuing what has been a remarkably muggy summer that’s brought wildfires, coastal erosion, record-breaking temperatures and general misery. — Karen Garcia, Los Angeles Times, 10 Sep. 2026

Word History

Etymology

English dialect mug drizzle

First Known Use

1728, in the meaning defined above

Rhymes for muggy

• buggy

Kids Definition

muggy

adjective

mug·​gy ˈməg-ē 

muggier; muggiest

: being warm and humid

a muggy day in August

mugginess noun