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Heat Index Calculator
Calculate the heat index (feels like temperature in heat). Find apparent temperature from air temperature and relative humidity.
Actual Temp
32°F
Feels Like
21.6°F
How to Use the Heat Index Calculator
Enter your values above for an instant result. This tool uses verified formulas and is optimised for users in USA, Canada, UK, Australia. All calculations happen in your browser — your data is never sent to our servers.
Frequently Asked Questions
When does heat become dangerous?
A heat index above 103°F (39°C) is dangerous. Above 125°F (52°C) is extreme danger with imminent heat stroke risk.