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

Combined with very low humidity and dry fuels, conditions could be conducive for rapid wildfire growth and spread. —Kyle Reiman, ABC News, 29 Mar. 2026

Northerly winds will be gusty, and when combined with low humidity, conditions are ripe for grass and brush fires to start easily and spread fast. —Kansas City Star, 27 Mar. 2026

The heat, low humidity and stiff winds will trigger alerts about fire weather through the day Thursday, March 26, before the cooler air arrives. —Cheyenne Derksen, Oklahoman, 26 Mar. 2026

Moisture — from humidity, sweat, or a shower — can intensify the reaction. —Natalie Krebs, Outdoor Life, 26 Mar. 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