Heat Index Calculator: How Hot Does It Really Feel?

Your details

Choose whether to enter relative humidity directly or a dew point temperature. Both methods give the same result.
The measured air temperature (in the shade, at screen level).
degF
The relative humidity as a percentage (0-100).
%
Heat Index (feels like)Danger
113.1

The apparent temperature accounting for humidity

Relative Humidity Used60%
Feels Hotter By18.1
NOAA CategoryDanger
Health RiskHeat cramps or exhaustion likely; heatstroke possible
113.1 degF
Comfortable<80Caution80-90Extreme Caution90-103Danger103-125Extreme Danger125+

NOAA category: Danger - heat cramps or exhaustion likely; heatstroke possible.

  • The heat index is 113.1 degF, so it feels 18.1 degF hotter than the air temperature because of the humidity.
  • At 60% relative humidity, sweat evaporates slowly, reducing your body's ability to cool itself.
  • Limit strenuous outdoor activity, drink water regularly, and seek shade or air-conditioning frequently.

Next stepCheck on elderly, children, and pets who may be inside vehicles or spaces without air-conditioning.

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