humidity

noun

hu·​mid·​i·​ty hyü-ˈmi-də-tē 

yü-

plural humidities

: a moderate degree of wetness especially of the atmosphere compare relative humidity

Synonyms of humidity

• moisture

Examples of humidity in a Sentence

the humidity of the region

It's not the heat that will get you—it's the humidity.

The temperature is 67 degrees with humidity at 75 percent.

an area of low humidity

Recent Examples on the Web

Pop-up afternoon and evening thunderstorms are possible each day due to the heat and humidity. — Andrew Kozak, CBS News, 30 June 2026

The oppressive heat and humidity will hover over the Midwest early this week, then move into the Mid-Atlantic and Northeast by Wednesday. — Briana Waxman, CNN Money, 29 June 2026

The effects for both will be worsened by humidity and cloud cover, with heat indices pushing 110. — Marc Ramirez, USA Today, 29 June 2026

Atlanta is no stranger to summer heat, but this week’s extreme humidity is expected to make temperatures in the upper 90s feel well above 100 degrees. — Nancy Badertscher, AJC.com, 29 June 2026

Word History

First Known Use

15th century, in the meaning defined above

Phrases Containing humidity

• absolute humidity
• relative humidity

Rhymes for humidity

• acidity
• aridity
• avidity
• cupidity
• fluidity
• liquidity
• lucidity
• morbidity
• placidity
• rancidity
• rapidity
• rigidity

Kids Definition

humidity

noun

hu·​mid·​i·​ty hyü-ˈmid-ət-ē 

yü-

plural humidities

: moisture, dampness

especially : the amount of moisture in the air

Medical Definition

humidity

noun

hu·​mid·​i·​ty hyü-ˈmid-ət-ē, yü- 

plural humidities

: a moderate degree of wetness especially of the atmosphere see absolute humidity, relative humidity