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

Due to the low relative humidity, warm temperatures and flammable conditions, meteorologists are concerned that thunderstorms could contribute to extreme fire risks. — Noe Padilla, USA Today, 20 July 2026

Tropical Storm Elida has been a factor in the rise in relative humidity in the Los Angeles and the San Francisco Bay areas, weather service meteorologists said. — Los Angeles Times, 20 July 2026

Residents can expect winds to be northwest to north winds 20 to 30 mph with gusts of 30 to 50 mph, strongest in Sundowner wind prone areas of southern Santa Barbara County and relative humidity 10 to 25%. — Ca Weather Bot, Sacbee.com, 15 July 2026

The material absorbs water from the air at room temperature when relative humidity reaches at least 18 percent. — Sujita Sinha, Interesting Engineering, 14 July 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