Heat Index Calculator
Calculate the perceived 'feels-like' temperature from air temperature and humidity using the NWS Rothfusz regression, with heat-stress risk levels
Heat cramps and heat exhaustion possible. Continuing activity may lead to heat stroke.
About the Heat Index
- • Uses the NWS Rothfusz regression with low-humidity and low-temperature adjustments
- • Most accurate at temperatures ≥ 80°F (27°C) and humidity ≥ 40%
- • Direct sun exposure can raise the apparent heat index by up to 15°F
- • Stay hydrated and limit outdoor activity during high heat-index conditions
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