relative humidity

noun

: the ratio of the amount of water vapor actually present in the air to the greatest amount possible at the same temperature

Examples of relative humidity in a Sentence

Recent Examples on the Web

At the same time, forecasters anticipate that relative humidity values in the region will sink down to single-digit values, meaning the air will be very dry. —Emily Mae Czachor, CBS News, 23 Apr. 2026

The relative humidity – a measure of the amount of moisture in the air relative to the maximum amount the air can contain at its actual air temperature – has also been very low due to warmer-than-usual temperatures and lower-than-usual moisture. —Zachary Handlos, The Conversation, 23 Apr. 2026

The combination of low relative humidity and breezy winds will lead to an elevated fire risk. —Nc Weather Bot, Charlotte Observer, 22 Apr. 2026

The wildfire threat is expected to continue Thursday in the Rockies and Plains as wind gusts are forecast to reach 60 mph and relative humidity is expected to be down to the single digits. —Jessica Gorman, ABC News, 22 Apr. 2026

Word History

First Known Use

1819, in the meaning defined above

Rhymes for relative humidity

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

Kids Definition

relative humidity

noun

: the amount of water vapor actually present in the air compared to the greatest amount possible at the same temperature

Medical Definition

relative humidity

noun

: the ratio of the amount of water vapor actually present in the air to the greatest amount possible at the same temperature compare absolute humidity