Heat Index Calculator (Feels Like in Humidity)
Heat index calculator: how hot it really feels when humidity is factored in, with the NWS risk level.
NWS Rothfusz regression of T and RH
How to use this calculator
- Type your input in the box.
- The result updates as you type.
- Use “Copy result” or “Copy link” to share it.
Humidity slows sweat evaporation, so the body cools less. Above a heat index of 103 °F heat exhaustion and heat stroke become likely with prolonged exposure.
Frequently asked questions
92 °F at 60 % humidity?
Feels like about 105 °F (danger).
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