Calculadora de ponto de orvalho
The detailed guide below is currently available in English.
What the dew point tells you
The dew point is the temperature at which air becomes saturated — cool it that far and water vapor starts condensing into dew, fog, or sweat-soaked discomfort. Unlike relative humidity, which swings with temperature, the dew point is a direct measure of how much moisture the air actually holds, which is why meteorologists trust it to describe mugginess.
Choosing a comfort band
Below 10°C (50°F) the air feels dry; 10–15.5°C (50–60°F) is the comfortable middle ground most people enjoy. From about 16–21°C (61–70°F) the air feels distinctly humid, and above 21°C (70°F) it turns oppressive — even a fit person walking outside will feel it. Home dehumidifiers usually aim for an indoor dew point near 12°C (mid-50s °F).
Perguntas frequentes
Why use dew point instead of relative humidity?
Relative humidity depends on the temperature: the same air reads 50% at noon and 90% after dark. The dew point moves only when real moisture is added or removed, so it compares fairly across the day.
What does a dew point above the air temperature mean?
It cannot happen. Saturation caps the dew point at the current temperature, which is the 100% humidity case — the temperature, dew point, and wet-bulb readings all meet.
How is this different from the heat index?
The heat index estimates heat stress on the body from temperature plus humidity, while the dew point is a physical property of the air itself. High dew points are exactly what drive the heat index upward.