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

Real-world conditions, such as humidity fluctuations and unstable signals, make this even more challenging. —Bojan Stojkovski, Interesting Engineering, 1 Feb. 2026

The smoothing formula includes 48-hour style memory, heat protection, and humidity control. —Reece Andavolgyi, InStyle, 31 Jan. 2026

Best Time to Visit Early fall is the best time to visit Bluffton (and avoid peak South Carolina humidity). —Lydia Mansel, Travel + Leisure, 31 Jan. 2026

Cold outdoor air also tends to be very dry, so opening a window may lower indoor humidity levels even more. —Caroline Lubinsky, Martha Stewart, 31 Jan. 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