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Heat Index Calculator
Calculate the apparent temperature (how hot it feels) using the Rothfusz regression
Instructions: Enter the air temperature in Fahrenheit ($T$) and relative humidity ($RH$) to compute the heat index. Valid for temperatures $\ge 80^\circ$F and humidity $\ge 40\%$.
Weather Conditions
Calculation Results
⚠️ For meteorological reference only. The Rothfusz heat index formula is strictly applicable when $T \ge 80^\circ\text{F}$ and $RH \ge 40\%$. Below these thresholds, heat index is roughly equal to ambient temperature.