Heat Index Calculator

Calculate the heat index (feels-like temperature) based on air temperature and humidity using NOAA/NWS algorithms. Includes dew point, wet bulb, humidex, and health recommendations.

NOAA/NWSHeat SafetyWeather
Heat Index Calculator
Enter temperature and humidity to calculate the heat index and related metrics

Temperature Input

Current air temperature

Choose Fahrenheit or Celsius

Humidity

Current relative humidity percentage (0-100%)

Wind Chill (Optional)

Include wind chill calculation for cold temperatures (below 50°F / 10°C)

Output Preferences

Preferred unit for results (defaults to input unit)