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

The relative humidity will be fairly high in the morning, reaching 96% at 7 a.m. Showers are also likely on May 4, during the Flying Pig Marathon and Paycor Half-Marathon. —Haadiza Ogwude, The Enquirer, 2 July 2025

Conditions can include a combination of strong winds, low relative humidity, and dry vegetation. —Joe Edwards, MSNBC Newsweek, 19 May 2025

Potentially record-high temperatures, wind gusts of up to 45 mph, low relative humidity and dry conditions are elevating the risk of wildfires spreading quickly across a large swath of the upper Midwest. —Bill Hutchinson, ABC News, 12 May 2025

For example, a PSPS is triggered in Hawaii if there’s a drought, wind gusts are over 45 miles per hour and relative humidity is under 45%. —Jay L. Zagorsky, The Conversation, 1 Apr. 2025

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