Apparent Temperature

How hot or cold it really feels. Heat index for warm humid air, wind chill for cold windy air, and dew point as a comfort indicator. Runs locally in your browser.

Air temperature

degrees Celsius (°C)

Relative humidity

percent relative humidity (%)

Enter values to see the apparent temperature.

Heat index uses the Rothfusz regression and applies when air temperature is at least 27 °C (80 °F) and humidity is ≥ 40%. Below those thresholds there is no meaningful heat index — the air just feels close to the thermometer reading. Runs locally — nothing leaves your browser.